摘要
本文采用 DSC、DMA 及电镜等方法研究了 CPE、CPE—g—VC 与 PVC 共混体系的熔融、玻璃化转变、动态粘弹性、微观结构和常温抗冲击性能。结果表明:对于氯化度较低的 CPE,及 CPE 投料量较高的 CPE—g—VC,其 DSC 曲线上存在着多个吸热峰。CPE 及 CPE—g—VC 与 PVC 共混时,玻璃化转变区温度升高.CPE 的热分析曲线上观察到 PE 链段的“预熔”,对于 CPE—g—VC/PVC 体系只有当动态粘弹谱中 tanδ低温峰值和高温峰值都变化时,其抗冲击性能才能显著改善.CPE—g—VC 含量的增加,可改善与 PVC 的相容性,提高抗冲击性能.CPE—g—VC/PVC具有微观网络结构。
The melting property,glass transitions,dynamic viscoelasticity,microstructureand impact resistance at normal temperature of chloridnated polyethytenes(CPE),graft copolymer of CPE with vinyl chloride(CPE—g—VC)and their blend systemwith PVC were studied by means of DSC,DMA,and electronmicroscope.The expe-rimental results showed that there were some absobing heat peaks in the DSC curveswhen the degree of chlorination of CPE is low and the loading of CPE is ratherlarge in CPE—g—VC.As blending with PVC,glass transition temperature of CPEand CPE—g—VC increases.The premelting phenomena of PE chain can be foundfrom the heat analysis curves of CPE.Only when the PE peak values of the tanδboth at the low and high temperature changed in dynamic viscoelastical spectrumof CPE—g—VC/PVC system,its impact resistance may be improved remankable-ly.Increasing the CPE—g—VC content will achieve better compatibility withPVC and enhence its impact resistance.There were Micro—net work structuresin CPE-g—VC/PVC blend.
出处
《中国塑料》
CAS
CSCD
1990年第3期23-30,共8页
China Plastics
