共查询到20条相似文献,搜索用时 31 毫秒
1.
Yafang Li Xiaomin Ma Nanping Deng Weimin Kang Huihui Zhao Zongjie Li Bowen Cheng 《Fibers and Polymers》2017,18(2):212-220
The nanofiber membrane prepared by electrospinning has been widely applied in lithium-ion batteries. A powerful strategy for designing, fabricating and evaluating Poly-m-phenylene isophthalamide (PMIA) nanofiber membrane with SiO2 nanoparticles was developed by electrospinning in this paper. The morphology, crystallinity, thermal shrinkage, porosity and electrolyte uptake, and electrochemical performance of the SiO2/PMIA nanofiber membranes were investigated. It was demonstrated that the nanofiber membrane with 6 wt% SiO2 possessed notable properties, such as better thermal stability, higher porosity and electrolyte uptake, resulting in higher ionic conductivity (3.23×10-3 S·cm-1) when compared with pure PMIA nanofiber membrane. Significantly, the SiO2/PMIA nanofiber membrane based Li/LiCoO2 cell exhibited more excellent cycling stability with capacity retention of 95 % after 50 cycles. The results indicated that the SiO2-doped PMIA nanofiber membranes had a potential application as separator in high temperature resistance lithium-ion batteries. 相似文献
2.
Study on heat and moisture vapour transmission characteristics through multilayered fabric ensembles
A detailed study on the heat and moisture vapour transmission characteristics of different types of single and multi-layered
fabric ensemble by using sweating guarded hot plate (SGHP) has been reported in the present paper. A comparison has been made
on thermal and moisture vapour transmission properties of five different insulative fabrics, namely, knitted-raised fabric,
needle punched nonwoven, through air bonded nonwoven, spunbonded-through air bonded sandwich nonwoven and warp knitted spacer
fabric and three different coated fabrics, namely, plain woven rubber coated, plain woven polyester polymer coated and plain
woven polytetrafluoroethylene (PTFE) coated fabric, used for thermal insulation purpose. ANOVA has been conducted to analyse
the significance of type of insulative and coated fabrics used. Sandwich nonwoven fabric which has higher thickness and porosity
shows higher thermal resistance followed by through air bonded fabric, raised fabric, needle punched fabric and spacer fabric.
Spacer fabric shows lesser evaporative resistance due to its lesser thickness and larger aperture size, which increases the
diffusion of moisture vapour. Needle punched fabric shows slightly higher evaporative resistance than spacer fabric, followed
by raised fabric, through air bonded fabric and sandwich nonwoven fabric. Permeability index of different multilayered fabric
ensembles are also compared. 相似文献
3.
The aim of this study is to examine the efficacy of the coconut fiber on the sound absorption and thermal insulation performance towards the composite nonwoven fabrics. The 2D polyester fiber and 12D fire retardant three-dimensional hollow crimp polyester fiber are individually mixed with 4D low-melting point polyester fiber (4DLMf) to produce 2D polyester nonwoven fabric (2D-PETF) and 12D polyester nonwoven fabric (12D-PETF) respectively. Subsequently, the coconut fiber (CF) is then laminated with the 2D-PETF and 12D-PETF to fabricate two types of PET/CF composite boards through the multiple needle-punching techniques. Accordingly, the sound absorption, thermal insulation, Limiting Oxygen Index and relative mechanical properties of the PET/CF composite boards are evaluated properly. The experimental results reveal that both types of PET/CF composite boards possess excellent thermal insulation performance and fire resistance property. Also, for both types of PET/CF composite boards, the average sound absorption coefficient increases with the increased amount of CF. 相似文献
4.
Ching-Wen Lou Chao-Tsang Lu Chin-Mei Lin Cho-Hsung Lee Chieh-Yu Chao Jia-Horng Lin 《Fibers and Polymers》2010,11(1):136-141
In this study, Polylactic Acid (PLA) nonwoven fabric and thermoplastic polyurethane (TPU) honeycomb air cushion (TPU-HAC)
were employed to form an impact resistant layer for functional knee pads. PLA nonwoven fabric has low manufacture cost and
flexibility of the honeycomb air cushion improved the quality of functional knee pad sold in the market. This study focused
on the strength of PLA nonwovens and the impact resistance of TPU honeycomb air pads. The PLA fibers and low-melting-point
(low-Tm) PLA fibers are used as raw materials to fabricate PLA nonwoven fabric. The PLA fibers and low-melting-point PLA fibers
were mixed at weight ratios of 10, 20, 30, 40, and 50 %. PLA nonwoven fabric and TPU-HAC materials were combined in a sandwich
structure to protect against impact. Impact resistance was evaluated using a falling-weight impact-resistance machine. Experimental
findings indicate that changing various layers can improve the impact resistance of the sandwich structure of the TPU-HAC
materials. A TPU-HAC layer with a thickness of 2/8/10 mm optimized the impact resistance. In 25 J falling-weight impact test,
the TPU-HAC layer 2/8/10 mm provides an impact resistance of 2932 N; the PLA/TPU-HAC composite had the best impact resistance;
2516 N. PLA nonwoven fabric had the best mechanical properties with low-Tm PLA fibers at 30 % weight. The impact resistance
achieved using above combination of materials met the level 2, range 3 impact values mentioned in EN 14120 standards. 相似文献
5.
Jung Soo Kim Ji Hye Choi Min Sung Kim Byeong Kwan Kang Hae Chan Kim Ji Eun Jang Dae Young Lim Youn Suk Lee Joon Chul Lee Dong Hyun Kim 《Fibers and Polymers》2018,19(2):416-422
We prepared itaconic acid based dispersants (IBDs) by the copolymerization of itaconic acid with acrylic acid, acrylamide, or vinyl sulfonic acid, and compared the efficacy of the IBDs on carbon fiber (CF) dispersion in a water-based system, against that of sodium dodecyl sulphate (SDS) which is widely used as a dispersing agent. The procedure to fabricate nonwoven CF (NCF)/PP composites using IBDs includes the following steps: the synthesis of IBDs, the dispersion of CFs in water by the IBDs, the formation of a NCF, and hot pressing of NCF with polypropylene (PP) layer. We determined the tensile, thermal properties, and the electrical conductivity of non-woven CF/PP composites. It was found that using IBDs as a CF dispersing agent led to the CF/PP composites having better tensile, thermal, and electrical properties, as compared to when SDS was used as a dispersing agent. 相似文献
6.
L. Raeisian Z. Mansoori R. Hosseini-Abardeh R. Bagherzadeh 《Fibers and Polymers》2013,14(10):1748-1753
The thermal characteristics of hollow polyester fibers were compared with solid polyester fibers in order to study their processing behavior and performance characteristics. The effects of different processing and structural properties including fiber diameter, bulk density of layer, and surface pressure on layers of needle-punched nonwoven fabrics with hollow fibers on thermal resistance properties were also investigated. The results show that hollow fibers have a higher thermal resistance in comparison with solid ones. This is a consequence of air trapping inside the fibers, higher bulkiness, and higher surface area of hollow fibers. Furthermore, thermal resistance of microfibers is better than those of macrofibers in both hollow and solid fibers. The thermal resistance of nonwoven subjected to this study, have an inverted-U-shaped pattern versus the bulk density of the fabric. The results also showed that thermal resistance of needle-punched nonwoven fabrics can be affected by the range of heater temperature during the test, however considerably can be affected by fabric thickness as a main structural property of nonwoven fabrics. 相似文献
7.
Polypropylene nonwoven fabrics were exposed to He/O2 atmospheric pressure glow discharge plasma. Surface chemical analysis and contact angle measurement revealed the surface
oxidation by formation of new functional groups after plasma treatment. Weight loss (%) measurement and scanning electron
microscopy analysis showed a significant plasma etching effect. It was investigated in low-stress mechanical properties of
the fabrics using Kawabata Evaluation System (KES-FB). The surface morphology change by plasma treatment increased surface
friction due to an enhancement of fiber-to-fiber friction, resulting in change of other low-stress mechanical properties of
fabric. 相似文献
8.
Wenjun Wang Yi Nie Yanrong Liu Lu Bai Jinsen Gao Suojiang Zhang 《Fibers and Polymers》2017,18(9):1780-1789
Cellulose/multi-walled carbon nanotubes (MWCNTs)- composite membranes applied in electrochemical and biomedical fields were prepared using 1-ethyl-3-methylimidazolium diethyl phosphate (EmimDEP) as solvent in this study. With the increasing of MWCNTs amount, the membrane conductivity increased, and the conductivity reached 9.1 S/cm as the mass ratio of MWCNTs to cellulose being 2:1. The additions of sodium dodecyl sulfate (SDS), 1-hexadecyl-3-methylimidazolium bromide (C16mimBr) and 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF4) efficiently improved the conductivity, mechanical property, and thermal stability by promoting the dispersion of MWCNTs. When the mass ratio of C16mimBr to MWCNTs changed from 0 to 0.3:1, the conductivity increased from 0.08 S/cm to 0.14 S/cm, and the tensile strength increased from 13.3 MPa to 17.0 MPa. These results indicate that the binary ionic liquids (ILs) system can regulate the properties of the composite membranes, and is a feasible approach for preparing cellulose/MWCNTs composite membranes with enhanced properties. 相似文献
9.
Ching-Wen Lou 《Fibers and Polymers》2008,9(3):286-292
A double-layer nonwoven fabric containing Tencel, cotton, and chitosan was prepared by the immersion-precipitation phase-inversion
method and evaluated as a wound covering. Macroporous structure of the chitosan membrane could control evaporative water loss,
promote fluid drainage, and inhibit exogenous micro-organisms invasion due to inherent antimicrobial property of the chitosan.
The chitosan membrane was hemostatic and could accelerate the healing of the wound. Histological examination showed that epithelialization
rate was increased and the deposition of collagen in the dermis was well organized by covering the wound with the membrane.
These results indicate that the chitosan-coated Tencel/cotton nonwoven fabric can be a potential material employed as a wound
dressing. 相似文献
10.
Carboxymethyl cellulose (CMC) is a cellulose derivative having water-soluble property, biodegradability, and biocompatibility. It has been used in various medical applications as forms of gel, film, membrane, or powder. In this study, composite CMC nonwovens were produced, by a wet-laid nonwoven process, to improve the wet strength of carboxymethyl cellulose nonwovens. Followed by preparing the CMC fibers from cotton fiber, the composite CMC nonwovens composed of CMC fibers and PE/PP bicomponent fibers were manufactured by using 85/15 % v/v of ethanol/water solution as a dispersion medium. Structural analyses of CMC fibers, such as XRD, TGA, FT-IR, and degree of substitution indicated that CMC fibers were successfully produced. The wet strength of CMC nonwoven was dramatically increased by blending with the PE/PP fibers without sacrificing the key properties for wound dressing materials such as liquid absorption, gel blocking and liquid retention. It is expected that the composite CMC nonwovens will be a good candidate for wound dressing materials for mild exudate condition. 相似文献
11.
Layered fabric systems with electrospun polyurethane fiber web layered on spunbonded nonwoven were developed to examine the
feasibility of developing protective textile materials as barriers to liquid penetration using electrospinning. Barrier performance
was evaluated for layered fabric systems, using pesticide mixtures that represent a range of surface tension and viscosity.
Air permeability and water vapor transmission were assessed as indications of thermal comfort performance. Protection performance
and air/moisture vapor transport properties were compared for layered fabric systems and existing materials for personal protective
equipment (PPE). Layered fabric systems with electrospun nanofiber web showed barrier performance in the range between microporous
materials and nonwovens used for protective clothing. Layered fabric structures with the web area density of 1.0 and 2.0 g/m2 exhibited air permeability higher than most PPE materials currently in use; moisture vapor transport was in a range comparable
to nonwovens and typical woven work clothing fabrics. Comparisons of layered fabric systems and currently available PPE materials
indicate that barrier/transport properties that may not be attainable with existing PPE materials could be achieved from layered
fabric systems with electrospun nanofibrous web. 相似文献
12.
The Allyl-heptaisobutyl-polyhedral Oligomeric Silsesquioxane (AHO-POSS) grafted polypropylene (PP) nanocomposite monofilaments were prepared by γ-ray irradiation induced grafting. The structure and properties of physically blended and γ-ray irradiated AHO-POSS/PP nanocomposite filaments were investigated by FTIR, wide-angle X-ray diffraction (WAXD), Thermo-gravimetric Analysis and mechanical property studies. Chemical bonding of AHO-POSS with PP after γ-ray irradiation was confirmed by FT-IR spectroscopy. Grafting resulted in change in mechanical and thermal properties and the extent of change was critically dependent on loading of AHO-POSS in PP and radiation dose level. In general, tensile strength decreased almost continuously with increase in radiation dose whereas thermal stability increased upto a radiation dose of 5 kGy and then decreased. The loss in tensile strength was caused due to chain scission, cross linking and loss in orientation. 相似文献
13.
Jung Tae Lee Myung Wook Kim Young Seok Song Tae Jin Kang Jae Ryoun Youn 《Fibers and Polymers》2010,11(1):60-66
Denim, a twilled cotton fabric, was used to enhance the mechanical and thermal properties of poly(lactic acid) (PLA). The
denim fabric reinforced composites with different numbers of denim layers were fabricated by using a hand layup method. The
impact, tensile, and dynamic mechanical properties of the composites were observed with increasing denim layers to examine
the reinforcing effect of denim fabrics. Numerical analysis was carried out to model the elastic modulus of the composite
by using a commercial software. Three-dimensional geometry of the denim fabric reinforced PLA composite was generated through
a CAD program, and the elastic modulus was calculated by applying uniform deformation on one surface. The impact strength,
tensile strength, and thermal properties of the composites were improved by piling denim fabrics. The denim fabric reinforced
composites exhibited outstanding impact strength due to the retarded crack propagation as well as large energy dissipation.
The 3 layer denim reinforced composite showed best results among all specimens, and its impact strength, tensile strength,
and tensile modulus were measured to be 82 J/m, 75.76 MPa, and 4.65 GPa, respectively. The PLA/denim composites have good
mechanical properties and can substitute traditional composites such as glass fiber or carbon fiber reinforced composites. 相似文献
14.
Mohammad Farsi 《Fibers and Polymers》2012,13(4):515-521
The objective of this investigation was to evaluate the mechanical, thermal stability and viscoelastic behaviors of experimental
PP composites made from wheat straw and PP-g-MA coupling agent. Four levels of wheat straw, 10, 20, 25 and 30 wt % and two
levels of coupling agent, 0 and 3 % wt were mixed with PP in rotary type mixer and injection molding process, respectively.
Tensile characteristics and impact strength, thermal gravity and dynamic mechanical and thermal analysis of the samples were
evaluated. Based on the results, it was observed that the tensile properties increased and impact strength decreased with
the increase in the fiber loading from 10 % to 30 %. Further, the composites treated with PP-g-MA exhibited improved mechanical
properties which confirmed efficient fiber-matrix adhesion. DMT analysis showed that the PP composites made of 30 % wheat
straw containing 3 % PP-g-MA showed the highest E’ and lowest tan δ than the untreated ones. Also, the thermal stability of
wheat straw was lower than PP and as filler content in the composites increased, the thermal stability decreased and the ash
content increased. 相似文献
15.
Octamethyl-POSS and Octaphenyl-POSS reinforced polypropylene nanocomposite monofilaments were prepared by melt blending route.
It was observed that incorporation of Octamethyl-POSS and Octaphenyl-POSS in polypropylene show improvement in mechanical
as well as thermal properties. Octaphenyl POSS/PP nanocomposites show significant increase in thermal stability even at very
low concentration as compared to neat polymer matrix. An increase of 100 and 140 °C was observed in thermal degradation temperature
at 5 wt% loss and maximum degradation over neat PP filaments respectively at low OP-POSS loadings (<5 wt%). Both Octamethyl-POSS
and Octaphenyl-POSS act as lubricating agents facilitating drawing which results in improvement in orientation as well as
mechanical properties. 相似文献
16.
The Allyl-heptaisobutyl-polyhedral oligomeric silsesquioxane (AHO-POSS) grafted polypropylene (PP) was prepared by reactive extrusion and by physical blending routes. The structure and properties of physically blended and reactively blended POSS/PP nanocomposites were investigated by FTIR, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analysis, SEM, spherutlic growth and mechanical properties studies. Chemical bonding of POSS with PP in reactive extrusion was confirmed by FT-IR spectroscopy. DSC and TGA studies showed that the thermal stability of AHO-POSS/PP nanocomposite prepared by reactive extrusion improved significantly as compared to only physically blended nanocomposites. WAXD studies showed decrease in crystallinity of the AHO-POSS/PP nanocomposites prepared by reactive extrusion. SEM studies showed aggregation tendency in case of physically blended AHO-POSS/PP nanocomposites. Spherulite growth studies show reactive blending retards spherulite growth in PP polymer. 相似文献
17.
The mechanical and thermal behavior of compression molded jute/polypropylene (PP) composites were studied by evaluating tensile strength (TS), bending strength (BS), tensile modulus (TM), bending modulus (BM), impact strength (IS), thermogravimetric (TG/DTG) and differential thermal analysis (DTA). A chemical modification was made to jute fabrics using N,N-Dimethylaniline (DMA) in order to improve the interfacial adhesion between the fabrics and matrix. It was found that jute fabrics on treatment with N,N-Dimethylaniline (DMA) significantly improved the mechanical properties of the composites. Thermal analytical data of PP, both treated and untreated jute fabrics as well as composites revealed that DMA treatment increased the thermal stability of the fabrics and composite. DMA treatment also reduced the hydrophilic nature of the composite. DMA treated jute composite was found less degradable than control composite under water, soil and simulated weathering conditions. 相似文献
18.
Marine collagen is an ideal material for tissue engineering due to its excellent biological properties. However, the limited mechanical properties and poor stability of marine collagen limit its application in tissue engineering. Here, collagen was extracted from the skin of tilapia (Oreochromis nilotica). Collagen-thermoplastic polyurethane (Col-TPU) fibrous membranes were prepared using tilapia collagen as a foundational material, and their physicochemical and biocompatibility were investigated. Fourier transform infrared spectroscopy results showed that thermoplastic polyurethane was successfully combined with collagen, and the triple helix structure of collagen was retained. X-ray diffraction and differential scanning calorimetry results showed relatively good compatibility between collagen and TPU.SEM results showed that the average diameter of the composite nanofiber membrane decreased with increasing thermoplastic polyurethane proportion. The mechanical evaluation and thermogravimetric analysis showed that the thermal stability and tensile properties of Col-TPU fibrous membranes were significantly improved with increasing TPU. Cytotoxicity experiments confirmed that fibrous membranes with different ratios of thermoplastic polyurethane content showed no significant toxicity to fibroblasts; Col-TPU fibrous membranes were conducive to the migration and adhesion of cells. Thus, these Col-TPU composite nanofiber membranes might be used as a potential biomaterial in tissue regeneration. 相似文献
19.
Alessandra Boschi Cristina Arosio Ilaria Cucchi Fabio Bertini Marinella Catellani Giuliano Freddi 《Fibers and Polymers》2008,9(6):698-707
Different silk substrates in form of spun silk tops, nonwoven web, yarn, and fabric were coated with electrically conducting
doped polypyrrole (PPy) by in situ oxidative polymerization from an aqueous solution of pyrrole (Py) at room temperature using FeCl3 as catalyst. PPy-coated silk materials were characterized by optical (OM) and scanning electron (SEM) microscopy, FT-IR spectroscopy,
and thermal analysis (DSC, TG). OM and SEM showed that PPy completely coated the surface of individual silk fibers and that
the polymerization process occurred only at the fiber surface and not in the bulk. Dendrite-like aggregates of PPy adhered
to the fiber surface, with the exception of the sample first polymerized in the form of tops and then spun into yarn using
conventional industrial machines. FT-IR (ATR mode) showed a mixed spectral pattern with bands typical of silk and PPy overlapping
over the entire wavenumbers range. DSC and TG showed that PPy-coated silk fibers attained a significantly higher thermal stability
owing to the protective effect of the PPy layer against thermal degradation. The mechanical properties of silk fibers remained
unchanged upon polymerization of Py. The different PPy-coated silk materials displayed excellent electrical properties. After
exposition to atmospheric oxygen for two years a residual conductivity of 10–20 % was recorded. The conductivity decreased
sharply under the conditions of domestic washing with water, while it remained essentially unchanged upon dry cleaning. Abrasion
tests caused a limited increase of resistance. PPy-coated silk tops were successfully spun into yarn either pure or in blend
with untreated silk fibers. The resulting yarns maintained good electrical properties. 相似文献
20.
Bidirectional PP/jute yarn eco-composites were fabricated via environment friendly commingling technique and its long term durability/life time was monitored as an effect of accelerated solar ageing on its mechanical properties (tensile & flexural). Accelerated solar ageing promoted the thermal oxidation of PP thus resulting in deterioration of its properties, however; MAPP and KMnO4 treated commingled composites showed much better stability towards thermal oxidation brought about by the solar concentrator, compared to untreated sample and neat polypropylene. This increased resistivity of treated composites (especially MAPP and KMnO4) towards thermal oxidation brought about by the solar concentrator is due to the increased interfacial adhesion between the matrix and jute yarn owing to chemical modifications. The significance of effective stress transfer between the PP matrix and reinforcing jute yarns is evident from the increased tear resistance of PP/jute yarn commingled composites with increasing fibre content and also with different chemical treatments. 相似文献