1,2-PBR和BR对EPDM硫化和力学性能的影响

考察了过氧化物硫化体系和硫黄硫化体系ＥＰＤＭ／１，２－聚丁二烯橡胶（１，２－ＰＢＲ）和ＥＰＤＭ／ＢＲ并用胶的硫化特性、交联密度和物理性质。结果表明：采用过氧化物硫化体系时，ＥＰＤＭ与１，２－ＰＢＲ和ＢＲ并用后，硫化胶的交联密度、１００％定伸应力、邵尔Ａ型硬度和撕裂强度增大，且前的增幅较大；采用硫黄硫化体系时，１，２－ＰＢＲ和ＢＲ均可提高ＥＰＤＭ的硫化速率，且随着１，２－ＰＢＲ用量的增大，硫化胶的

Influence of 1,2-PBR and BR on curing behavior and physical properties of EPDM

The curing behavior,the crosslinking density and the physical properties of EPDM/1,2 PBR and EPDM/BR blends cured with the peroxide curing system and the sulfur curing system respectively were investigated.The results showed that the crosslinking density,the modulus at 100% elongation,the Shore A hardness and the tear strength of EPDM/1,2 PBR and EPDM/BR cured with the peroxide curing system increased,and those of EPDM/1,2 PBR increased more significantly;the cure rate of EPDM was increased by blending with 1,2 PBR or BR when cured with the sulfur curing system,and the crosslinking density,the modulus at 100% elongation and the Shore A hardness of the vulcanizate decreased slightly as the proportion of 1,2 PBR increased,the modulus at 100% elongation and the tensile strength of the vulcanizate decreased significantly as the proportion of BR increased.It was found by DSC that the better covulcanization of EPDM/1,2 PBR blend was obtained with the peroxide curing system.