PVC基热塑性弹性体的制备与性能

Preparation and Properties of PVC-Based Thermoplastic Elastomer

采用丙烯酸酯单体与聚氯乙烯(PVC)通用树脂共混,通过原位聚合反应制备PVC基热塑性弹性体。研究了增塑剂邻苯二甲酸二辛酯(DOP)的用量、丙烯酸酯橡胶的种类及用量对PVC基热塑性弹性体力学性能、动态力学性能以及加工流变性能的影响。结果表明,随着DOP用量的增加,材料的断裂伸长率逐渐增加,而拉伸强度呈现下降趋势,每100份PVC树脂中DOP用量为50份左右时,材料的拉伸强度出现最小值。同时,实验所使用的丙烯酸酯橡胶玻璃化转变温度(Tg)越低,所制备的PVC基热塑性弹性体的断裂伸长率越大,加工流变性能越好,而材料的拉伸强度越低。

PVC.-based thermoplastic elastomer （TPVC） was prepared by in-situ polymerization with acrylate monomers and PVC resin. The influences of the plasticizer and acrylic rubbers on the mechanical properties, the dynamic mechanical properties and the processing rheological properties of the PVC-based thermoplastic elastomer were studied. The results show that with the increase of the plasticizer dioctyl phthalate （DOP）, the elongation at break of TPVC materials gradually increases, and its tensile strength shows a decreased trend. While the glass transition temperature （Tg） of the used poly （acrylate） rubber is much lower, the elongation at break and the processing rheological properties of TPVC are much better than pure PVC materials, however the tensile strength of the TPVC is decreased.