1，2-PBR和BR对EPDM硫化和力学性能的影响

杨军　 陈朝晖　 吕晓静　 王迪珍　

摘　要：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、交联密度和物理性能。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，且前者的增幅较大；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，硫化胶的交联密度、100％定伸应力和邵尔A型硬度略有减小，拉伸强度和撕裂强度增大，而随着BR用量的增大，硫化胶的100％定伸应力和拉伸强度明显减小。通过差示扫描量热分析发现：过氧化物硫化体系中，EPDM／1，2-PBR并用胶中EPDM和1，2-PBR的共硫化程度较大。
关键词：EPDM；BR；1，2-聚丁二烯橡胶；并用
分类号：TQ333，4　文献标识码：A
文章编号：1000-890X(2000)12-0707-05

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

YANG Jun ,CHEN Zhao-hui ,LU Xiao-jing ,WANG Di-zhen
(South China University of Technology, Guangzhou 510640, China)

Abstract：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 96 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.
Keywords：EPDM; BR; 1,2-PBR; blend