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采用KMnO_4、H_2O_2和浓H_2SO_4等氧化剂,在水介质中对聚苯硫醚(PPS)进行处理,结果表明,KMnO_4能将PPS表面层的S大部分氧化为砜基—SO_2—,但使PPS分子量增大的效果较差;H_2O_2能将PPS表面层的S氧化成亚砜基—SO—或砜基—SO_2—,以哪一种为主取决于H_2O_2的用量与反应时间。同时,氧化过程能使PPS的分子量增大,96％的H_2SO_4可使PPS表面层部分磺化而具有一定的H~+交换能力。然而,这些异相氧化反应对PPS的T_s无明显影响,它未能完全破坏粉末PPS的结晶相,但影响了PPS熔融后再结晶的能力。
KMnO_4, H_2O_2 and H_2SO_4 and other oxidants were used to treat polyphenylene sulfide (PPS) in aqueous media. The results showed that KMnO_4 can oxidize most of S in the surface of PPS to sulfone-SO_2-, but the PPS molecular weight H 2 O 2 can oxidize S of PPS to sulfoxide-SO- or sulfone-SO 2 2-, which depends mainly on the amount of H 2 O 2 and the reaction time. At the same time, the oxidation process can make the molecular weight of PPS increase, 96% H 2 SO 4 can partially sulfonate PPS surface layer and have some H ~ + exchange ability. However, these heterogeneous oxidation reactions had no significant effect on the T_s of PPS, which failed to completely destroy the crystalline phase of PPS, but affected the ability of PPS to recrystallize after melting.