超声波辐照下PVC的降解及与丙烯酸丁酯共聚反应的研究

研究了在超声波辐照下，聚氯乙烯（ＰＶＣ）在环己酮溶液中的降解及与丙烯酸丁酯（ＢＡ）的共聚反应。结果表明，ＰＶＣ在超声波辐照下可降解成低分子量产物，其分子结构与玻璃化温度基本未变。ＰＶＣ的超声降解符合一般力降解规律，降解动力学方程为（２１．５ｋＨｚ，３８０Ｗ，２５℃１．０％ＰＶＣ）ｌｎ＝１．５６×１０~（－４）ｔ。经ＩＲ、ＸＰＳ、ＮＭＲ等分析表明，ＰＶＣ与ＢＡ的超声共聚产物主要为嵌段共聚物。所得共聚物可以明显提高ＰＶＣ的冲击强度。

ULTRASONIC DEGRADATION AND COPOLYMERIZATION OF POLY(VINYL CHLORIDE)WITH BUTYL ACRYLATE

The ultrasonic degradation and copolymerization of poly (vinyl chloride)(PVC)with butyl acrylate (BA) in cyclohexanone were studied.The results show that the molecular structure and glass transition temperature of PVC unchanged after degradation.The degradation reaction follows the mechanodegradation kinetic equation suggested by Ovenall.The structure of the copolymer was identified by IR, XPS and NMR.It is mainly a block one.The impact strength of PVC is obviously improved after blending it with a small amout of the copolymer.