氯化聚氯乙烯分子结构-亚微相态-加工性能之间关系的研究

Relationship of Molecular Structure, Morphology and Processing Properties of Chlorinated Poly （ vinyl chloride）

利用凝胶渗透色谱仪、核磁共振谱仪和扫描电子显微镜对6种氯化聚氯乙烯（PVC-C）的相对分子质量及其分布、氯含量、分子链中3种基本结构（-CH2-、-CHCl-、-CCl2-）的摩尔分数、PVC-C粒子的亚微相态进行了研究，并用Brabender转矩流变仪研究了各种PVC-C的加工性能。结果表明，PVC-C在相同氯含量时，分子链中含有较少的—CCl2-结构时有利于提高树脂的热稳定性；PVC-C的加工流动性随着相对分子质量和氯含量的增加而下降，较宽的相对分子质量分布有利于改善树脂的加工流动性；树脂颗粒皮层较薄或者被破坏，内部亚颗粒子堆积均匀时为理想的亚微相态，树脂有较好的加工性能。

GPC, NMR and SEM were used to study the molecular weight and distribution, chlorine percentage, the molar fraction of three basic structures （-CH2-,-CHCl-,-CCl2-）, micro-morphology of chlorinated poly（vinyl chloride） （PVC-C） particle. Processing property of 6 kinds of PVC-C resins was investigated using torsion rheometer. It showed that low contents of the group -CCl2- in the molecule of PVC-C favored the thermal stability. Processability of PVC-C became worse with increasing molecular weight and chlorine content. The wider the molecular distribution, the better the processing properties. When the cortex of granule is flimsy and the inner micro-granules were even, PVC-C has better processing property.