HIPS/HVPBR热塑性硫化胶压缩永久变形可逆回复的模型及机制

采用动态硫化法制备了高抗冲聚苯乙烯(HIPS)/高乙烯基聚丁二烯(HVPBR)热塑性硫化胶(TPV),研究了橡塑比和热处理温度对压缩永久变形可逆回复的影响,探讨了可逆回复机制并构建了数学模型。结果表明,提高橡塑比和热处理温度,压缩永久变形的可逆回复程度和回复速度明显提高;热处理温度接近基体Tg时,体系的压缩永久变形几乎完全可逆;基于可逆回复过程,探讨压缩永久变形的可逆回复机制,并构建了其数学模型,进而探讨了橡塑比和热处理温度对可逆回复各阶段松弛时间的影响。

Mechanism and Model Construction of Compression Set Reversible Rrecovery of HIPS/HVPBR Thermoplastic Vulcanizate

Thermoplastic vulcanizate （TPV） based on high impact polystyrene （HIPS）/high vinyl polybutadiene rubber （HVPBR） blends were prepared by dynamic vulcanization, and the influences of blending ratio and heat-treatment temperature on the reversible recovery of compression set,together with the mechanism and model construction of the reversible recovery of the TPV, were investigated systematically. The results showed that increasing the content of HVPBR in TPV and increasing heat- treatment temperature would lead to the fast recovery of compression set; moreover, the TPV had fully reversible deformation ability when the heat-treatment temperature was close to the Tg of HIPS. The reversible recovery mechanism was discussed based on the characteristics of the reversible recov- ery curves of compression set. A mathematical model to explain the reversible recovery of compression set was established via the fitting of the experimental data, and the influences of blending ratio and heat-treatment temperature on the relaxation time in each stage of the recovery course were discussed.