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以甲基丙烯酸锌(ZDMA)为补强剂填充丁腈橡胶(NBR),采用动态硫化法制备了系列乙烯-醋酸乙烯共聚物(EVA)/NBR/ZDMA热塑性硫化胶(TPV),研究了ZDMA用量及热处理温度对压缩永久变形可逆回复程度的影响,探讨了可逆回复机制并拟合出数学模型。结果表明,提高TPV热处理温度,其压缩永久变形的回复速度和回复程度显著提高,热处理温度为75℃时,TPV的压缩永久变形可逆回复程度最大;增大TPV中ZDMA用量,压缩永久变形的可逆回复减慢;基于TPV的微观相态结构和变形可逆回复特征,探讨了其压缩永久变形的可逆回复机制。
A series of ethylene vinyl acetate (EVA) / NBR / ZDMA thermoplastic vulcanizates (TPV) were prepared by the dynamic vulcanization process with ZDMA as reinforcing agent. The effects of ZDMA Dosage and heat treatment temperature on the degree of reversible restoration of compression set, discussed the reversible recovery mechanism and fitted the mathematical model. The results show that the recovery rate and recovery of compression set of TPV increase significantly when the heat treatment temperature of TPV is increased. When the heat treatment temperature is 75 ℃, the reversible recovery of compression set of TPV is the largest. Increasing the amount of ZDMA in TPV and reversible compression set The response was slowed down. Based on the microscopic phase structure of TPV and the reversible recovery of deformation, the reversible recovery mechanism of compression set was discussed.