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首页> 外文期刊>Journal of Applied Polymer Science >Effect of segment structure on the thermal stability of CPVC in the Gas-Solid PVC chlorination process
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Effect of segment structure on the thermal stability of CPVC in the Gas-Solid PVC chlorination process

机译：段结构对燃气固体PVC氯化过程中CPVC热稳定性的影响

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摘要

The chlorination of the polyvinyl chloride resin with different ratios of -CH2-, CHCl2, and CCl2 was carried out through a gas-solid process by varying the temperature, reaction time, and chlorine concentration. The rheological properties and thermal stability of the resin were characterized. C-13 NMR was used to characterize the segment structure of the resin. In addition, conjugated diene structure was determined by UV-Visible to study its chlorination process. The results show that -CCl2- units in the structure promote the dehydrochlorination of CPVC, forming a conjugated diene structure and reducing the rheological properties and thermal stability. In contrast, the formation of -CHCl- in the chlorination process increased the thermal stability of the resin. Moreover, a structure-effect relationship between the structure and performance has been established, and a stepwise process of chlorination was obtained by analyzing the changes of the structure segment content at different stages.
机译：通过改变温度，反应时间和氯浓度，通过气体固体方法进行不同比例的聚氯乙烯树脂的聚氯乙烯树脂的氯化。表征树脂的流变性和热稳定性。 C-13 NMR用于表征树脂的区段结构。此外，通过UV可见测定缀合的二烯结构以研究其氯化过程。结果表明，该结构中的-CCL2-单元促进CPVC的脱氯化氯化，形成共轭二烯结构并降低流变性能和热稳定性。相反， - 在氯化过程中的形成增加了树脂的热稳定性。此外，已经建立了结构和性能之间的结构效应关系，并通过分析不同阶段的结构段内容的变化来获得逐步的氯化过程。

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