含不饱和官能团MgAl-LDH/EPDM复合材料的制备及力学性能

Preparation and mechanical properties of MgAl-LDH with unsaturated functional groups/EPDM composites

分别用十二烷基硫酸钠(SDS)、十一烯酸(UA)、油酸(OA)作为插层剂,通过离子交换反应制备有机层状双氢氧化物(OLDHs),并采用熔融共混法制备OLDHs/三元乙丙橡胶(EPDM)复合材料.通过橡胶加工分析仪对复合材料进行表征,研究了其力学性能.结果表明,不饱和官能团碳碳双键的引入,特别是不饱和官能团在插层剂碳链末端时,有利于OLDHs在硫化过程中形成自由基与基体发生化学交联反应,对复合材料的邵氏A硬度、拉伸强度和伸长模量提高更加明显.

The organic layered double hydroxides （ LDH - DS, LDH - UA, LDH - OA） were prepared by ion exchange reaction with sodium dodeeyl sulfate （ SDS）, undecylenic acid （ UA）, oleic acid （OA） as the intercalating agent, respectively. And the OLDHs/EPDM composites were obtained via melt mixing. The composites were characterized by rubber process analyzer, and the mechanical properties of the composites were investigated. The results showed that the presence of carbon - carbon double bond was conducive to the OLDHs to form the radical crosslinking with substrate during the vulcanization process, the unsaturated functional groups in the end of the carbon chain of the intercalating agent especially. Therefore, the Shore A hardess, the tensile strength, elongation modulus of the OLDHs with the unsaturated functional groups/EPDM composites were more improved.