CPE对纳米CaCO_3增韧PVC复合材料界面和性能的影响

Interfacial Structure and Mechanical Properties of Nano-CaCO_3/PVC Composites Affected by CPE

研究了CaCO3/CPE(氯化聚乙烯)/PVC(聚氯乙烯)纳米复合材料的结构和性能,探讨了CPE对纳米CaCO3/PVC复合材料界面作用和力学性能的影响.SEM结果显示,引入CPE可明显改善纳米CaCO3颗粒在PVC基体中的分散性和相容性,提高其界面作用.引入界面作用参数定量表征纳米CaCO3颗粒与基体之间的界面结合作用,证实随着CPE加入量的增大,基体和颗粒之间的界面作用逐渐增大.力学性能研究表明,相对于仅用纳米CaCO3增韧PVC,在CPE加入量为PVC的0～8%(ω)范围内,用CPE和纳米CaCO3协同增韧可以更好地提高复合材料的冲击强度.复合材料的冲击强度在CaCO3/CPE/PVC质量比为25/8/100时达到纯PVC的5.6倍,是纳米CaCO3/PVC(25/100)体系的2倍.

The effect of chlorinated polyethylene （CPE） elastomer on microstructure, mechanical properties and interfacial adhesion of PVC composites filled with nano-CaCO3 particles was investigated. The morphology of the fracture surfaces of the blends was observed by SEM. It was found that the dispersion and interfacial adhesion of nano-CaCO3 particles in PVC matrix were improved with the addition of CPE elastomer. The interfacial adhesion between nano-CaCO3 particles and PVC matrix was characterized by interfacial interaction parameter B quoted from TPT equation. It was found that the more the CPE elastomer added, the higher the interfacial adhesion reached. The effect of CPE on the mechanical properties of PVC filled with nano-CaCO3 particles and CPE was also investigated, and it revealed that compared to the case of only addition of nano-CaCO3 particles the impact strength of PVC composites increased more dramatically with the addition of CPE elastomer and nano-CaCO3 particles. The notched impact strength of nano-CaCO3/CPE/PVC could reach 25.2 kJ/m^2 with the mass ratio of nano-CaCO3/CPE/PVC at 25/8/100, which was 5.6 times as high as that of pure PVC composites and 2 times of nano-CaCO3/PVC （25/100） composites.