桐腈橡胶的合成及其对环氧树脂的增韧改性研究

Study on the synthesis of tung oil-based nitrile rubber and its toughening modification of epoxy resin

将桐油皂化水解产物桐油酸与丙烯腈乳液聚合制得桐腈橡胶(CEAA),通过红外和紫外光谱、凝胶色谱及^1H-NMR对其结构进行了表征。以CEAA增韧环氧树脂并经甲基四氢苯酐固化后,对其力学和热力学性能以及断裂面形貌进行了研究。结果表明:桐腈橡胶能够提高环氧树脂的韧性,改性环氧树脂的断裂伸长率和断裂吸收功分别提高了189%和167%,并在SEM图片中观察到明显的韧性断裂特征,但未出现相分离现象。CEAA通过加入的柔性分子诱发塑性形变增韧环氧树脂,但改性环氧树脂的力学和热性能随CEAA含量的增加呈下降趋势。

The tung oil-based nitrile rubber(CEAA)was synthesized by emulsion polymerization of tung oil saponified hydrolysate eleostearic acid and acrylonitrile.The structure was characterized by infrared spectroscopy,ultraviolet spectroscopy,gel chromatography and ^1H-NMR.The mechanical and thermodynamic properties and the fracture surface morphology of the CEAA toughened epoxy resin cured by methyltetrahydrophthalic anhydride were investigated.The results showed that the toughness of the epoxy resin could be improved by the tung oil-based nitrile rubber.The elongation at break and the fracture absorption work of the modified epoxy resin were increased by 189% and 167%,respectively.The obvious ductile fracture characteristics were observed in the SEM image,however,the phase separation was not occurred.The epoxy resin was toughened by plastic deformation induced by adding flexible molecules of CEAA,but the mechanical and thermal properties of modified epoxy resin were decreased with the increasing of CEAA content.