Synthesis of Rosin Based Crosslinking Agent and Its Effect on Properties of Cured Silicone Rubber北大核心CSCD

Rosin modified aminopropyltriethoxysilane(RA) was obtained via rosin derivatization reaction. RA was used as crosslinking agent to prepare rosin based room temperature vulcanized silicone rubber and to study its effect on the morphology, mechanical and thermal properties of rubber. It was found that rosin based silicone rubber had better mechanical and thermal properties than those of the traditional silicone rubber. The tensile strength and elongation at break of rosin based silicone rubber were 0.51 MPa and 353% respectively, under the conditions of 11.1 g RA and 30 g hydroxyl terminated polydimethylsiloxane as primary polymers. Compared with the traditional silicone rubber, tensile strength and elongation at break of rosin increased by 11% and 84%, meanwhile the maximum weight loss rate temperature was 592 ℃, rising by 201 ℃. Correspondingly, the residual rate at 800 ℃ increased by 4.17% and the glass transition temperature of the silicone rubber also increased slightly. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Synthesis and Antibacterial Activity of Derivatives of Rhein北大核心CSCD

Based on carboxyl amidation of rhein(1), a series of derivatives of rhein were synthesized by structure modification of C7 of anthraquinone mother nucleus. And the antibacterial activity and structure-activity relationship of the derivatives were preliminary discussed. The derivatives of rhein were respectively rhein piperidine amide(2), 7-hydroxymethyl-rhein piperidine amide(3), 7-bromomethyl-rhein piperidine amide(4), 7-(4-morpholino)methyl-rhein piperidine amide(5a), 7-(pyrrolidin-1-yl)methyl-rhein piperidine amide(5b), 7-(1-methyl-4-piperazinyl)methyl-rhein piperidine amide(5c). The structures of the compounds were characterized by IR, 1H NMR, 13C NMR, MS. The minimal inhibitory concentrations (MIC) of the compounds obtained were tested and the MIC of compounds 5a and 5b against E.coli reached 0.78 and 0.39 mg/L respectively. Their antibacterial activity were stronger than that of rhein(MIC 3.13 mg/L) obviously, even stronger than that of the kanamycin(MIC 1.56 mg/L); and the MIC of compound 5a against S. aureus reached 1.56 mg/L, which was similar to that of rhein. The preliminary analysis of structure effective relationship showed that if none replace heterocyclic groups were introduced into substituent of C7 of the mother nucleus, the antibaterial activity on E.coli would be stronger. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Synthesis Mechanism of Tris(2-hydroxyethyl)isocyanate Modified Melamine Formaldehyde Impregnated Resin北大核心CSCD

The tris(2-hydroxyethyl)isocyanate(THEIC) modified melamine formaldehyde(MFT) impregnated resin was prepared with THEIC, melamine(M) and formaldehyde(F) as raw materials. The MFT resin could achieve the requirements of GB/T 14732-2006. The stability of MFT resin was significantly improved with THEIC, as the n(THEIC)/n(F) was 10 % or 15 %. MFT resin(n(F)/n(M) =1.85 and n(THEIC)/n(F)=15 %) remained highly transparent up to 24 days, and its free formaldehyde was only 0.05 %. Infrared characterization of MFT resin analysis showed that the absorption peaks of carbonyl functional groups of MFT resin changed to 1680.9 cm-1 from 1670.7 cm-1 in THEIC. The C〖FY=,*2〗N absorption peak in melamine ring was 1525.7 cm-1, and split up into two peaks(1545.3 and 1504.0 cm-1) in MFT resin. 13C NMR qualitative and quantitative analysis the reaction process of the MFT resin showed that the hydroxymethyl of amino in melamine was the main reaction and accompanied with the etherification reaction (between hydroxymethyl, hydroxymethyl and THEIC). The main reaction products were oligomers. The joining of the THEIC made the reverse reaction of the condensation of amino and hydroxyl groups, which was hydrolysis reaction,and proved that the resin storage period increased. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Preparation of Rosin-based N-Heterocyclic Carbene Catalyst and Its Catalytic Properties for Addition Reaction of Aryl北大核心CSCD

Two kinds of rosin-based N-heterocyclic carbene (NHC) from dehydroabietylamine and acrypimaric amine were designed and synthesized, and their structures were identified by FT-IR, 1H NMR, 13C NMR, MS and elemental analysis. For screening the catalysts and evaluating their activity, the novel rosin-based NHC molecules were used to catalyze the addition reaction of aromatic aldehydes and aryl boronic acids. The results showed that catalytic activity of the acrypimaric-based NHC(Ap-NHC) was better than that of dehydroabietic-based NHC(Da-NHC), and the optimal catalytic effect was presented at reaction conditions of reaction temperature 60 ℃, the reaction time 4 h, the amount of catalyst 2.5 % and potassium tert-butoxide as alkali, and the yield reached to 95 %. Finally, the influence of different substituent groups on the reactant was studied. When the aryl boronic acid reacted with the aromatic aldehyde with electron withdrawing group, the yield was the highest, while the substituent on the boric acid had little effect on the reaction. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Effects of Liquid Crystalline Epoxy Resin on the Properties of Bio-based Cardanol-furfural Resin北大核心CSCD

By using polarized optical microscopy, differential scanning calorimetry, scanning electron microscopy and impact strength measurements,the effects of liquid crystalline on the morphologies, thermal properties and mechanical properties of the composite resins were studied. It was found that the synthesized 4,4-diglycidyloxybiphenyl (BP) and sulfanilamide (SAA) were used to generate novel liquid crystalline (LC) epoxy resins notably. The results revealed that the curing of the cardanol-furfural resins was accelerated and the thermal properties were considerably improved by adding the LC epoxy resins.When the addition of BP-SAA was 50%, the glass transition temperature increased from 60.4 ℃ to 70.2 ℃, and the thermal decomposition temperature increased from 300.3 ℃ to 377.4 ℃, respectively. When the addition of BP-SAA was 30%, the impact strength of the modified resins was 15 kJ/m2 and about three-fold higher than that of the unmodified counterpart. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Thermal Decomposition Characteristics and Kinetics of Tea Stalk北大核心CSCD

In order to provide comprehensive utilization of tea stalk waste by thermochemical conversion, the thermal decomposition process of tea stalk and its kinetics were studied with simultaneous measurements of thermogravimetry (TG)/differential thermal analysis (DTA). The TG-DTG-DTA curves of tea stalk were acquired in a nitrogen atmosphere. The results indicated that the mass loss process of the samples could be divided into five stages. Among the five stages, most of the decomposition occurred in the third and fourth stages. The two main stages were indicated as exothermic processes, with the average weight loss rates of 55.12% and 28.48% at different heating rates of 10, 15, 20, 25 K/min, respectively. At higher heating rate, the fourth stage of the decomposition reaction was shifted to higher temperature range. The thermal decomposition kinetic parameters were calculated by Kissinger, FWO peak maximum evolution and FWO isoconversional methods. The results showed that the Kissinger and FWO peak maximum evolution methods were more suitable for the thermal decomposition kinetic parameters. The apparent activation energies were calculated to be 666.53 and 642.80 kJ/mol by the two methods, respectively. And natural logarithm of the pre-exponential factor (lnA) calculated by Kissinger method was given as 145.83. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Isolation and Identification of Antifungal Ingredients from Artemisia hedinii北大核心CSCD

The extraction of Artemisia hedinii Ostenf. et Pauls(A. hedinii) were rough and further isolated by chromatographic separation technology, and the antifungal activity of the component was evaluated by the the spore germination method. Furthermore, the composition of antimicrobial components was analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS). The results showed that 13 kinds of components(Fr.1-Fr.13) were rough isolated from the extraction of A. hedinii, in which the component Fr.5 showed the best antifungal activity. Four kinds of components (Fr.5.1-Fr.5.4) were obtained by the further separation of the component Fr.5. The EC50 of A. hedinii crude extraction on Alternaria alternate (A.alternate) spores was 5.04 g/L, and that of the component Fr.5.2 was 0.57 g/L. The HPLC-MS results showed that the components of Fr.5.2 mainly contained deoxy double hydroxyl artemether (17 %),deoxy dihydroartemisinin (43.65 %) and deoxyartemisinin (16.15 %). The content of dihydroartemisinin of component Fr.5.2 was calculated as 40.95 % by using dihydroartemisinin as the standard. The EC50 of dihydroartemisinin on A.alternate was 2.70 g/L, indicating that the major antifungal matter in component Fr.5.2 was artemisinin derivatives. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Characterization Methods of Wood Ultrastructure and Its Research Progress北大核心CSCD

The characterization methods of wood cell wall ultrastructure were generally reviewed in the context.In particular,four approaches including the X-ray diffraction, nuclear magnetic resonance, atomic force microscopy and confocal Raman microscopy, were detailed in their application and research status, which could provide the methods and ideas for future exploration of the microphase structure of wood. Additionally,the advantages and limitations of each technology were also summarized.Moreover,the existing drawbacks and future direction of cell wall structure research were clearly pointed out. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Technology of Microwave-assisted Extraction of Sapindus Peel Polysaccharide and Its Antioxidant Activity北大核心CSCD

The microwave extraction technology and in vitro antioxidant capacity of polysaccharides from Sapindus peel were studied in this work, and the primary structure of the polysaccharide was also characterized. The effects of microwave extraction temperature, extraction time and liquid-solid ratio on the yield of polysaccharides were investigated. The microwave extraction process was optimized by response surface analysis. The results showed that the optimum extraction process conditions were as follows: extraction temperature 92 ℃, extraction time 26 min, liquid-solid ratio 25:1(mL:g). The maximal yield of polysaccharides reached 3.47%. Sapindus peel polysaccharide is mainly composed of glucose, xylose, galactose, arabinose and fructose, with typical polysaccharide IR characteristics. In addition, the anti-oxidative activity of polysaccharides was evaluated by the scavenging ability on hydroxyl radicals and DPPH free radicals. Sapindus peel polysaccharides showed strong antioxidant activity in a concentration-dependent manner, and the antioxidant activity of the crude polysaccharides was significantly higher than that of purified polysaccharides. The antioxidant activity of polysaccharides has a certain correlation with the glycoprotein structure. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Comparation on UV curing reactivity of Allyl abietate and allyl isopimarate北大核心CSCD

The UV curing reaction of the difference between allyl abietate(AA) and allyl isopimarate(AI) was studied. The conversion rate of the vinyl double bond was characterized and detected by FT-IR analysis. Results showed that conversion of double bonds are firstly increased then decreased with the increases of the dosage of initiators. Conversion of double bonds firstly increased and then leveling off with the increases of the illumination time, and AA is higher before the 200 s. AA is higher then AI under the same illumination intensity. Surface drying time of AA is shorter than AI, and relative curing speed become faster at the same conditions. Under the conditions of 2-hydroxy-2-methylpropiophenone(Darocure-1173)as photo initiator and dosage 6%, illumination time 200 s, illumination distance 4.5 cm and illumination intensity 100%, number average molecular weight of cure products of AA and AI are 4 176 and 9 407 with polymerisation degrees of 12 and 28, respectively. The obtained UV cured coating all have smooth and transparent appearance. It represented some superior properties in flexibility, mechanical impact strength, adhesive power, hardness, acid resistance, alkali resistance, salt resistance, water resistance, etc.. The hardness of AA and AI cured products are H and HB, respectively.     

Preparation of 1,8-p-Menthane Diacetamide from p-Menthadienes北大核心CSCD

Using p-menthadienes and acetonitrile as raw materials, 1,8-p-menthane diacetamide was prepared in sulfuric acid solution via Ritter reaction. The effects of the mass fraction of sulfuric acid solution, the molar ratio of p-menthadienes to sulfuric acid solution and acetonitrile, reaction temperature, reaction time and the type of p-menthadienes on the yield of 1,8-p-menthane diacetamide were optimized. The results showed that when c(H2SO4)=60%, n(H2SO4):n(p-menthadienes)= 2.2:1, n(acetonitrile):n(p-menthadienes)=2.4:1, T= 55 ℃, t=6 h, the yield of 1,8-p-methane diacetamide is the highest. Among different pure component compounds in p-menthadienes, limonene is the most efficient starting material and got the highest yiled of 61.6%. The structure of the product was identified and characterized by FI-IR,ESI+-MS and 1H NMR. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Self-assembly,Mixed System and Drug-loading Research of Rosin-based Tertiary Amine Salt北大核心CSCD

A novel maleic rosin-based ester tertiary amine salt surfactant (RETAS) with three hydrophilic groups was synthesized through D-A addition reaction, acyl chlorination, esterification reaction and salt forming reaction with rosin acid as raw material. The critical micelle concentration (CCMC) of RETAS was 0.73 mmol/L (0.50 g /L), and the corresponding surface tension at CMC (γCMC) was 38.58 mN/m. The RETAS was mixed with natural soapnut saponin. The best compound proportion of mixed system was obtained by determining the surface tension, emulsification property and foam property to study the synergistic effect. And the self-assembly behavior and micelle morphology of the composite system was characterized by transmission electron microscopy (TEM) and the micelle formation mechanism was speculated in detail. The results showed that the γCMC and CCMC of mixtures were 37.57 mN/m and 0.40 g/L when the optimum mass ratio of RETAS/soapnut saponin was 5:5. The emulsifying properties of RETAS and saponin were only 292 s and 310 s respectively, but the emulsifying properties increased to 373 s in the optimum mass ratio. Finally, the cytotoxicity of RETAS on human colon adenocarcinoma cells (Caco-2) was investigated and it was found that it had non-toxic or low toxicity and was applied to study the drug loading properties of anticancer drug doxorubicin (DOX). The release rates of DOX on RETAS were 67 % and close to 100 % in pH value 7.4 and 5.0, respectively. While the release rates of DOX on the mixture were 68 % and close to 90 % in pH value 7.4 and 5.0. The results showed that both RETAS and mixed product could be used as the target carrier of DOX. Under simulated tumor conditions, DOX was still slowly released after 24 hours in pH=5.0. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Preparation of Core-shell Magnetic Rosin-based Polymer Microspheres and Their Adsorption Kinetics and Thermodynamics of Mn2+北大核心CSCD

The core-shell magnetic rosin-based polymer microspheres Fe3O4@RPM were synthesized by chemical precipitation and suspension polymerization with maleic rosin ethylene glycol acrylate as cross-linking agent, methacrylic acid and methyl methacrylate as monomers, and Fe3O4 as a magnetic core. The preparation conditions were optimized. The structure of Fe3O4@RPM was characterized by Fourier transform infrared spectrometer(FT-IR), field emission scanning electron microscope (FESEM), X-ray diffraction instrument(XRD), and thermogravimetric analysis(TGA), and so on. The adsorption kinetics and thermodynamics for adsorbing Mn2+ were studied through static adsorption experiments. The results showed that the preparation conditions of the polymeric magnetic microspheres with phenanthrene framework were shaking at the speed of 400 r/min,adding 1 g azodiisobutyronitrile as initiator and reacting for 4 h at 70 ℃. The second-order kinetics model could well describe the adsorption process of Mn2+ in the experimental range of concentration and temperature, the adsorption thermodynamic studies showed that ΔH >0,ΔG <0,ΔS >0,which indicated that the adsorption was a spontaneous endothermic process. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Ultrasonic-assisted Radical Process for Directed Degradation of Arabinogalactan北大核心CSCD

Arabinogalactan (AG) was extracted from the sawdust of larch (Larix gmelinii(Rupr.) Kuzen). The arabinogalactan obtained was physically degraded by ultrasound-assisted free radicals. The free radical scavenging ability of decomposed AG was selected as an indicator on the evaluation of the antioxidant activity. On the basis of single-factor test, response surface optimization was used to determine the optimal degradation conditions, and the optimum conditions are found as follows: the dpolysaccharide concentration was 10 g/L; ultrasonic temperature was 60℃; the H2O2 volume fraction was 6%; and the ultrasonic time was 60 min. Under this optimum degradation condition, the ·OH scavenging rate of arabinogalactan was 89.6%, and Mr of AG was degraded from 52 ku to around 25 ku, and the cumulative weight fraction of this molecular weight reached 60%.Compared with AG, the antioxidant activity of arabinogalactan oligosaccharide(AG-O) obtained in the anti-oxidative activity was significantly enhanced, and its IC50 value decreased from 2.058 g/L to 0.497g/L. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Application Progress of Nano-cellulose in Paper-based Functional Materials北大核心CSCD

The classification and properties of nano-cellulose were introduced. The nano-cellulose was divided into nano-cellulose crystal(NCC), microfibrillated cellulose(MFC) and bacterial nano-cellulose(BNC). NCC has a rod-like whisker structure with high crystallinity and high mechanical properties. MFC is filamentous, with wide size range and larger aspect ratio, large specific surface area and strong hydrogen bonding ability. BNC has ultrafine network structure with high degree of chemical purity and polymerization, and strong water retention ability. The application status of nano-cellulose in paper-based reinforced materials, paper-based antimicrobial materials, paper-based filter materials, paper-based conductive materials, paper-based luminescent materials, paper-based insulating materials, paper-based hydrophobic materials and paper-based sensor materials was reviewed. The future development of nano-cellulose in paper-based functional materials was also prospected. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Preparation of Aspergillus niger Mycelium-chitosan Biosorbent and Its Cu2+ Adsorption Mechanism北大核心CSCD

The waste Aspergillus niger mycelium and chitosan were cross-linked by epichlorohydrin and then solidified sodium tripolyphosphate to prepare the Aspergillus niger mycelium-chitosan biosorbent for Cu2+. The effects of adsorption time, pH value, temperature, the initial concentration of Cu2+ and the amount of biosorbent on the adsorption efficiency were investigated. Kinetics, intragranular diffusion model, adsorption isotherm equation, thermodynamic model were used to fit the experimental data. The results showed that the adsorption rate increased by increasing the adsorption temperature, adsorption time and pH value. The adsorption rate of Cu2+ reached 99.42% at the adsorption conditions of 0.4 g Aspergillus niger mycelium-chitosan biosorbent, adsorption time 180 min, adsorption temperature 50 ℃, mass concentration of Cu2+ 20 mg/L. The adsorption process conformed to the Freundlich isotherm model. The adsorbed Gibbs free energy became negative, and ΔHθ were ΔSθ are 6.104 2 kJ/mol and 45.258 1 J/(mol·K), respectively, ie the adsorption was a spontaneous endothermic process. Kinetic data analysis showed that the adsorption of Cu2+ by Aspergillus niger mycelia-chitosan biosorbents fitted quasi-second-order kinetic model. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

Process Conditions and Performance of Polyacrylate-based Super Absorbent Resin Prepared with Lignin-related Compounds北大核心CSCD

Lignin including alkali lignin (AL), lignosulfonate (LS), lignocresol (LC), lignoresorcinol (LR) and lignopyrogallol (LP) were grafted by acrylic acid (AA) to synthesized water-absorbent resin under aqueous solution with potassium persulfate (KPS) as initiator and N,N'-methylene-bis-acrylamide (MBA) as crosslinking agent. The morphological characteristic water-absorbing capacity and salt tolerance of different resins were compared. The effects of different lignins on the pore structure and specific surface area were studied. The swelling behaviors of the resins were fitted by the swelling kinetics model. The results indicated that the water absorption capacities of resins were according to the order of lignopyrogallol grafted polyacrylic acid resin(LP-g-PAA, 2 137 g/g) >lignosulfonate grafted polyacrylic acid resin (LS-g-PAA, 1 348 g/g) >lignoresorcinol grafted polyacrylic acid resin (LR-g-PAA, 1 344 g/g)>lignocresol grafted polyacrylic acid resin (LC-g-PAA, 1 262 g/g) > Alkaline lignin grafted polyacrylic acid resin (AL-g-PAA, 518 g/g)>polyacrylic acid resin (PAA, 439 g/g). The FE-SEM and BET specific surface area analyses showed that the addition of different lignins could change the pore structure and specific surface area to different degree, shich would affect the absorption. And the swelling behaviors of the resins were proved to according with Schott swelling kinetics model(R2>0.98). Salt tolerance of LP-PAA resin were affected by the valence of ion,radius of hydrated ion and concentration of ion and the results were as follows: KCl>KNO3≈LiCl>K2SO4> K2CO3> CaCl2>FeCl3. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

中国林业科学研究院林产化学工业研究所北大核心CSCD

中国林业科学研究院林产化学工业研究所(简称林化所)成立1960年,为副司局级单位,是专业从事木质和非木质林产品化学加工与利用,集基础研究、应用研究、产品开发及工程设计为一体的综合性同家科研院所。拥有中国工程院     

松香色度标准块北大核心CSCD

计量标准器具竭诚欢迎使用检定本产品具有国内行业中质量检验的权威性长期、周到的售后服务让客户无后顾之忧松香色度标准装置(又名《松香颜色分级标准》玻璃比色块),是符合我国松香光学特性具有完整体系的松香颜色分级标准。1982年荣获林业部科技成果二等奖。1987年至今,被《脂松香》、《松香试验方法》国家标准所采用,并多次经国家质量监督检验检疫总局     

西南林业大学材料工程学院北大核心CSCD

材料工程学院是西南林业大学最早成立的院系之一,是西南林业大学区域高水平大学建设中一所以工科为主的重要教学科研学院。学院具有"林业工程"一级学科博士、硕士授予权,拥有云南省重点学科"木材科学与技术"和校级重点学科"林产化