固相氯化法合成氯化聚乙烯的红外光谱研究

本文研究在不同条件固相氯化聚乙烯(CPE)的红外光谱,探讨了一步和两步氯化合成的CPE的结构差别,着重讨论了两步氯化的CPE结构特点。从观察表征结晶结构和—(CH_2)_n—链段氯分布的特征频率变化表明,低温固相氯化主要发生在无定形区,并且在CPE中形成高氯化和低氯化链段(或未氯化)的嵌段结构。在两步固相氯化时,晶区受到较大程度的破坏,氯化作用已不局限在无定形区,其结晶结构的破坏主要同第二步氯化程度有关,即使CPE氯含量相同,若前后两步氯化程度不同,结构有很大差异。

STUDIES ON INFRARED SPECTROSCOPY OF CHLORINATED POLYETHYLENE (CPE) FROM SOLID-PHASE CHLORINATION

This paper reports the IR spectroscopy of CPE synthetized by solid-phase chlorination process under different conditions. We also emphatically discussed the structural characterics of CPE, chlorineted by two steps. It was observed that the modification of a characteristic crystalline structure and chlorine distribution on-(CH2)n-chain segments. The results showed that the solid-phase chlorination mainly occured in amorphous regions under the lower temperature conditions, and also formed a block structure with a high and low (or non-) chlorinated chain segment in CPE. If the solid-phase chlorination was processed in two steps, the crystalline region would be destroyed with a higher degree. The chlorination process is limited any longer the amophous region, and whether the destruction of crystalline structure is related to the degree of chlorination in the second step. Even if its chlorine contents is all the same as to CPE. But only variation with chlorination degree in two steps, therefore the structure will be signif-cantly different.