通过调整共聚单体的组成（St／AN）及聚丁二烯与共聚单体的投料比，合成了一系列具有不同接枝共聚组成和核壳比的ABS接枝共聚物。将其与氯化聚氯乙烯CPVC树脂熔融共混，研究了CPVC／ABS共混物的性能和形态结构。结果表明，SAN共聚物和CPVC树脂为不相容体系，但当SAN共聚物中AN含量为20％～25％时，两者之间表现出较强的相互作用。CPVC／ABS共混物的力学性能和形态结构显著地依赖于接枝SAN共聚物的AN含量和ABS接枝共聚物的核壳比，当AN含量为20％～25％、核壳比为40／60时，ABS橡胶粒子能够均匀地分散在CPVC基体树脂中，共混物表现出良好的冲击韧性。
Acrylonitrile-butadiene-styrene grafting copolymers (ABS) with different St/AN compositious and core/shell ratios were synthesized. Chlorinated polyvinyl chloride(CPVC)/ABS blends were prepared by bleuding of ABS graft copolymer and CPVC resin. The property and morphology of CPVC/ABS blends were studied. The results show that SAN copolymer is immiscible with CPVC resin, but the SAN copolymer and CPVC show a strong interaction wbon the AN content of SAN copolymer is between 20% -25%. The mechanical properly and morphology of ABS/CPVC blends are obviously influenced by the AN content of SAN copolymer and the core/shell ratios of ABS graft copolymer. When the AN content of SAN is 20% -25% and the core/shell ratio is 40/60, polybutene (PB) rubber particles could be dispersed uniformly in the CPVC matrix, and the ABS/CPVC blend has the excellent impact toughness.
参考文献
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