偶联剂对木薯淀粉补强天然胶乳硫化胶膜性能的影响

摘要

采用偶联剂改性木薯淀粉补强天然胶乳,研究偶联剂种类和用量对木薯淀粉/天然胶乳硫化胶膜物理性能和动态力学性能的影响,并对其微观结构进行观察.结果表明,加入偶联剂Si69的硫化胶膜的物理性能较好,当偶联剂Si69用量为0.6份时,硫化胶膜的综合物理性能达到最佳.动态力学性能分析表明,淀粉经偶联剂改性后,硫化胶膜的损耗因子减小,玻璃化温度向低温方向移动,低温使用性能提高.扫描电子显微镜分析显示,偶联剂的加入可以改善淀粉在天然胶乳中的分散效果,提高淀粉与橡胶的界面结合作用.%The cassava starch was modified by coupling agent, and the influence of type and addition level of coupling agent on the properties of cassava starch/NR latex vulcanized film were investigated. The results showed that,the physical properties of vulcanized film were the best when the coupling agent Si69 was used,and the optimum addition level of coupling agent Si69 was 0. 6 phr. It was indicated by DMA that the tan?and glass transition temperature of the modified cassava starch filled vulcanized film were decreased,and the low temperature performance was improved. It was proved by SEM that, the dispersion of starch in NR latex and the bonding behavior between starch and rubber were improved when the coupling agent was used.