马来海松基环氧纳米复合材料的制备及性能研究

以松香为原料,通过Diels-Alder加成制备了马来海松酸酐(MPA),再经过酯化、闭环反应得到了马来海松基环氧树脂(MPA-ER),并用FT-IR和1 H NMR对MPA和MPA-ER的结构进行了表征.进一步将多壁碳纳米管(MWCNTs)与MPA-ER共混制备了一系列的MPA-ER/MWCNTs复合材料,对其力学性...

Preparation and Properties of Maleopimaric-based Epoxy Nanocomposite

Maleopimaric anhydride(MPA)was prepared from rosin by Diels-Alder addition,and then maleopimaric epoxy resin(MPA-ER)was prepared by esterification and closed-loop reaction.The structures of MPA and MPA-ER were characterized by FT-IR and 1 H NMR.A series of MPA-ER/MWCNTs composites were prepared by blending multi-wall carbon nanotubes(MWCNTs)with MPA-ER,the mechanical and thermal properties of the composites were characterized,and the effects of MWCNTs addition on the mechanical and thermal properties of maleopimaric epoxy nanocomposites were investigated.The results of FT-IR and 1 H NMR showed that MPA and MPA-ER were successfully prepared.MWCNTs were well dispersed in MPA-ER,and the cross-section had river-shaped texture features.The mechanical properties of MPA-ER/MWCNTs were significantly improved by adding MWCNTs.When the addition of MWCNTs was 1.2%(calculated by the mass of MPA-ER,similarly hereinafter),the mechanical properties of the composite MPA-ER/MWCNTs(1.2)were optimized.Its impact toughness,tensile strength,bending strength and elongation at break were 15.11 kJ/m 2,40.42 MPa,105.45 MPa and 14.80%,which increased by 159%,160%,102%and 135%compared with those of MPA-ER,respectively.At the same time,in cone calorimeter test,the peak heat release rate and carbon residue rate of MPA-ER/MWCNTs(1.2)composite were 324 kW/m^2 and 9.18%,respectively.Compared with MPA-ER,the peak heat release rate decreased by 14%,and the carbon residue rate increased by 68%,which indicated that the addition of MWCNTs also improved the thermal stability and flame retardancy of MPA-ER/MWCNTs.The improvement of flame retardancy of MPA-ER/MWCNTs(1.2)composites was mainly attributed to the effective increase of crosslinking density of epoxy resin by adding MWCNTs,and forming a relatively dense carbon layer in the interior of epoxy resin,and then the flame retardant effect was achieved by partially isolating the external heat and air.