氯乙烯-丙烯酸乙酯共聚物／纳米CaCO3复合母粒改性PVC力学性能的研究

通过对纳米碳酸钙（n—CaCO3）表面改性及其对聚氯乙烯（PVC）、氯乙烯-丙烯酸乙酯共聚物（VC／EA）、n-CaCO3三元复合体系加工工艺的考察，研制了（VC／EA）／n—CaCO3复合母粒改性的PVC材料，并对其力学性能进行了研究。结果表明，利用将VC／EA共聚物与n—CaCO3先制成复合母粒，再与PVC进行共混的二次分散成型工艺，有利于n-CaCO3在基体中的分散；当复合母粒中VC／EA与n—CaCO3的比例为2：3时，材料的力学性能最佳，n-CaCO3对材料具有补强作用，并且n—CaCO3和VC／EA能协同增韧PVC，使材料的冲击强度得到大幅度提高，当PVC和复合母粒比例为100：20（质量比）时，材料的冲击强度达到41．5kJ／m^2，是纯PVC（PVC的冲击强度为4．914／m^2）的8．5倍，拉伸强度仍高达50．8MPa。

Study on Mechanical Properties of PVC Modified by the Masterbatch of (Binyl Chloride/Ethyl Acrylate) Copolymer/(Nanometer Calcium Carbonate)

Vinyl chloride/ethyl acrylate copolymer (VC/EA) was blended with surface modified nanometer calcium carbonate (n-CaCO3) to form a masterbatch which was subsequently introduced into poly(vinyl chloride) (PVC). The n-CaCO3 was well dispersed in the resin matrix. When the weight ratio of VC/EA to n-CaCO3 in the masterbatch was 2:3, optimal mechanical properties were obtained. When the weight ratio of PVC to the masterbatch [ (VC/EA) /n-CaCO3 = 2:3] was 100:20, an impact strength of 41. 5 kJ /m2, which was 8. 5 times that of neat PVC (4.9 kJ /m2) , and a tensile strength of 50. 8 MPa were achieved.