杨永清, 马宇翔, 王小龙
（宁夏大学化学化工学院， 宁夏银川750021）
DOI:10.13732/j.issn.1008-5548.2021.02.012
收稿日期： 2020-11-05， 修回日期：2020-11-21，在线出版时间：2020-12-26 15:25。
基金项目：宁夏自然科学基金项目，编号：2019AAC03002。
第一作者简介：杨永清(1978—)，女，博士，副教授，研究方向为功能性复合材料。E-mail：yqyang@nxu.edu.cn。
摘要：将不同牌号的三元乙丙橡胶(EPDM)共混，研究微观结构如门尼黏度、第三单体(ENB)和乙烯基质量含量对其力学、热学和硫化等性能的影响。结果表明:随门尼黏度的增大，EPDM的力学性能、热稳定性和硫化速度提高，但撕裂强度先增大后减小;随乙烯基含量的增加，EPDM的抗拉强度和撕裂强度先增大后减小，硬度增大，热稳定性提高，硫化速率加快。随ENB质量含量的增加，硫化胶的抗拉强度和硬度均增大;扯断伸长率、抗撕裂性能和硬度减小，硫化速度加快。当乙丙橡胶EP35与EP75F以质量比3∶7混合时，胶料的抗拉强度为23.69 MPa，断裂伸长率为886.41%，硬度值为75.30，撕裂强度为43.55 k N/m。
关键词：三元乙丙橡胶；结构参数；力学性能；硫化性能；热稳定性
Abstract：Based on the different structural parameters of EPDM,the effects of the microstructure such as Mooney viscosity,the third monomer ENB content and vinyl content on the mechanical properties,thermal properties and the vulcanization properties were investigated. The results show that with the increasing of the viscosity,the mechanical properties,thermal stability and vulcanization rate of EPDM are increased,but the tear strength is firstly increased and then decreased. With the increasing of vinyl content,the tensile strength and tear strength of EPDM are increased firstly and then decreased. The hardness,thermal stability and the vulcanization rate are increased. With the increasing of ENB content,the tensile strength the vulcanization rate and the hardness are increased,and the tear strength,the elongation at break and the thermal stability are decreased. When EP35 and EP75 F are mixed with mass ratio at 3∶7,EPDM has good properties. The tensile strength is 23. 69 MPa,the elongation at break is 886. 41%,the hardness is 75. 30 MPa and the tear strength is 43. 55 k N/m.
Keywords：ethylene-propylene-diene monomer; microstructure parameter; mechanical property; vulcanization property; thermal property
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