原位聚合法制备吸水膨胀NR及其性能研究

采用原位聚合法制备聚丙烯酸钠并接枝到天然胶乳分子上，制备吸水膨胀NR（WSNR），并对其热稳定性、物理性能和吸水性能进行研究。结果表明，WSNR耐热性能较NR大幅提高；添加改性剂后，WSNR硫化胶的定伸应力增大，拉伸强度和拉断伸长率减小；添加苯乙烯、甲基丙烯酸甲酯、乙酸乙烯酯和丙烯酸乙酯改性剂使WSNR硫化胶的最大吸水膨胀倍数由8.7分别增大至54.6，29.6，19.3和10.5。;Polyacrylate sodium was prepared by in-situ polymerization and grafted to natural rubber latex to prepare water swelling natural rubber(WSNR)，and the thermal stability，physical properties and water absorption were investigated.The results showed that the thermal stability of WSNR improved greatly compared with NR；the modulus of WSNR vulcanizate increased，and tensile strength and elongation at break decreased by adding modifiers；when modifier styrene，methyl methacrylate，vinyl acetate and ethyl acrylate were used，the swelling ratio of WSNR vulcanizate rubber increased from 870% to 5 460%，2 960%，1 930% and 1 050%，respectively