强界面PVC-U/nano-CaCO_3的制备与力学性能研究

Preparation and Mechanical Properties of UPVC/nano-CaCO_3 in Strong Interface Adhesion

使用自主合成的端羧基聚酯和端叔胺基羧酸分别对水乳液中的nano CaCO3进行表面处理,制备了可与PVC形成界面分子物理纠缠或热可逆交联的强界面结合能力的nano CaCO3。研究了PVC U/nano CaCO3的力学性能与CaCO3的表面性质、填充量及表面处理剂分子量等因素的关系。研究结果表明,提高界面结合强度可改善CaCO3在基材中的分散状况并提高PVC U/nano CaCO3的屈服强度,却对于提高PVC的冲击能力无明显效果。

The relationships between the mechanical properties of UPVC/nano-CaCO_3 and the content of nano-CaCO_3 particles, the surface quality and the molecular weight of the surface treatment agents were studied.The used nano-CaCO_3 particles were coated in its water emulsion,with the liquid linear polyester possessing one end-carboxylic group which could tangle PVC chain,or with aliphatic tertiary amine possessing one end-carboxylic group which could crosslink PVC chain thermally rever-sibly.The results showed that increasing of the interfacial adhesion between inorganic particles and polymer contributed to improving the dispersal of nano-CaCO_3 particles in the polymer matrix, and to increasing the yield stress obviously but a little increasing the toughness of UPVC.