摘要
以热膨胀发泡微球为发泡剂,采用双螺杆挤出机及模压法制备了微发泡三元乙丙橡胶(EPDM)/聚丙烯(PP)复合材料。利用差示扫描量热法(DSC)研究了该热塑性硫化胶(TPV)及其微发泡复合材料的非等温结晶动力学。结果表明:TPV及其发泡复合材料的非等温结晶过程与Ozawa动力学方程不符,但可用Jeziorny和莫志深(Mo)动力学方程描述。微发泡复合材料的起始结晶温度、最大结晶温度在同一降温速率下均比相应的TPV高,这表明发泡微球具有一定的成核作用;另外,表征结晶速率的半结晶时间(t1/2)明显延长,说明发泡微球的加入对TPV结晶有一定的延缓作用,而复合物较大的空间体积结构所导致的位阻效应是延缓TPV结晶的主要原因。
Micro-foamed ethylene-propylene-diene monomer/polypropylene（EPDM/PP） thermoplastic vulcanizate（TPV） material was prepared by twin screw extruder and mold-pressing using foamed microsphere as physical blowing agent.The nonisothermal crystallization kinetics of TPV and micro-foamed TPV were studied by differential scanning calorimetry（DSC）.The results show that： the nonisothermal crystallization processes of TPV and micro-foamed TPV may be described by the kinetic equations of Jeziorny and Mo,but do not agree with Ozawa equation.The initial and maximum crystallization temperatures of micro-foamed TPV are higher than those of pure TPV at the same cooling rate,thus showing the nucleating function of the blowing agent.While the crystallization half time（t1/2） of micro-foamed TPV is apparently longer than that of pure TPV,this means that the blowing agent may retard the crystallization process of TPV,and the steric effect caused by the larger space volume of composites is the main reason for the slower crystallization.
出处
《塑料科技》
CAS
北大核心
2013年第1期47-52,共6页
Plastics Science and Technology
基金
安徽省人社厅中鼎密封件股份有限公司博士后工作站资助项目
安徽省省级自然科学研究项目(KJ2010A017)
安徽省自然科学基金项目(11040606Q03)
关键词
热塑性硫化胶
微发泡
非等温结晶
Thermoplastic vulcanizate
Micro-foamed
Nonisothermal crystallization
