【摘要】 本文研究了聚氯乙烯/丙烯酸酯类共聚物(PVC/ACR)共混物的应力-应变行为和冲击强度对ACR 用量的依赖关系。ACR对 PVC有良好的增韧作用,提高了PVC抗冲击性能。考察了三盐基性硫酸铅和硬脂酸钡-硬脂酸镉稳定剂对共混体系的影响,实验结果说明不同的热稳定体系对ACR改性PVC的效果有差别。动态力学性能测定结果表明PVC/ACR共混物存在两个玻璃化转变温度,证明PVC与ACR不相容性;而两个转变温度随共混物组成改变而变化,说明PVC与ACR之间存在着相互作用,PVC/ACR为部分相容体系。通过透射电子显微镜观察PVC/ACR共混物的微观结构形态表明:PVC与 ACR为两相体系,ACR呈粒状分布在PVC连续相中。但是,采用硬脂酸钡-硬脂酸镉稳定体系时,随着ACR用量增加,ACR的分散形态由粒状分散逐渐形成网络结构形态,与此相对应的共混物具有更好的抗冲击性能。更多还原

【Abstract】 The microstructure-properties of Poly(vinyl chloride)/acrylic copolymer (PVC/ACR) blends have been studied by using dynamic mechanical analysis (DMA), transmission electron microscopy (TEM), stress-strain, and impact testing. Experimental results indicated that the PVC/ACR had a good impact property, and it was evident that the barium-cadmiun stearate-stabilizer was better than the tribasic lead sulfate for PVC/ACR blends. Two transition temperatures of each blend revealed by the DMA spectra showed that they varied as the composition of the blend changed, therefore the PVC/ACR blends were semi-compatible. TEM records illustrated that they exhibited two phase systems with ACR dispersed as a particle in PVC phase. In the barium cadmiun stearate system when the ACR content was high, the ACR was presented as a network structure in PVC phase. The bland having the above coresponding morphology has a high impact strength.更多还原