Effects of Co-Agents on the Properties of Peroxide-Cured Ethylene-Propylene Diene Rubber (EPDM)

天然橡胶 固化(化学) 材料科学 活化能 丙烷 动力学 反应速率常数 硫化 三元乙丙橡胶 二烯 过氧化物 乙丙橡胶 反应级数 治愈率 弹性体 高分子化学 复合材料 化学 共聚物 有机化学 聚合物 外科 物理 医学 量子力学
作者
He Wang,Ying Ding,Shugao Zhao
出处
期刊:Journal of Macromolecular Science, Part B [Taylor & Francis]
卷期号:55 (5): 433-444 被引量:23
标识
DOI:10.1080/00222348.2016.1151630
摘要

The influence of three different co-agents, triallyl isocyanurate (TAIC), trimethylol propane trimethacrylate (TMPTMA) and high vinyl poly(butadiene) (HVPBd), on the curing characteristics, including the cure kinetics, of peroxide-cured EPDM compounds and the mechanical properties of the resulting EPDM vulcanizates were studied. The results showed that the addition of each co-agent could improve the cure extent of the EPDM samples; the hardness and modulus of the EPDM vulcanizates were also improved. In particular, the compound containing TAIC obtained the highest cure extent. However, the addition of TMPTMA negatively affected the scorch safety, especially below 165°C. From the cure kinetics of the EPDM compounds, obtained by using the cure data from a moving die rheometer, it was found that the Deng–Isayev, first-order and Hsich models showed better agreement with experimental data compared to the Kamal–Sourour model. The reaction rate constants were gradually increased with the elevated temperature, and TMPTMA could significantly promote the curing reaction rate, TAIC secondly, while HVPBd showed no effect. In addition, the apparent activation energy of all EPDM compounds, calculated by the Deng–Isayev model, was estimated slightly higher than that of the other three kinetic models. However, due to the addition of the three co-agents, the activation energy of the curing reaction decreased, with the EPDM compound with TAIC showing the lowest activation energy.
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