离子作用对SPS/MMA4VP复合物组成及Tg的影响  

Effect of Ionic Interaction on the Composition and Tg of Sulfonated PS/MMA-co-4VP Complexes

作　　者：邱星屏[1] 

机构地区：[1]厦门大学材料科学系,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2000年第1期84-88,共5页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金

摘　　要：采用粘度，差示扫描量热法研究了磺化聚苯乙烯（ＳＰＳ）与甲基丙烯酸甲酯－４－乙烯基吡啶共聚物（ＭＭＡ４ＶＰ）所形成的离子复合物．探讨了聚合物链上离子作用基团的相对浓度对复合物组成及结构的影响．研究发现，ＳＰＳ／ＭＭＡ４ＶＰ离子复合物的平均组成是由酸碱离子对的静电作用与聚合物链的立体位阻双重因素决定的．当两种高分子链上的离子基团浓度相同时，形成摩尔比为１∶１ 的复合物．当两种高分子链上酸碱离子基团浓度不相同时，离子含量高的链可以复合较多的离子含量低的链．离子作用在共混复合物中可起到物理交联的作用，使共混复合物的玻璃化转变温度升高．The complexation behavior of sulfonated polystyrene (SPS) containing 9.2 mol% acidic units and poly(methyl methacrylate co 4 vinyl pyridine) (MMA4VP) containing 4.1, 9.5 and 20.2 mol% of basic units has been studied by viscometry and differential scanning calorimetry (DSC). The results showed that, as the ratio of basic/acidic units varies from 0.4 to 2.2, the mean stoichiometry of SPS/MMA4VP complexes changes from 0.8 to 1.25, whereas SPS with MMA4VP chains containing the same amount of interacting groups formed 1∶1 stoichiometric complex. DSC measurements revealed that the T g of the complex blends is influenced by the ionic interactions. For SPS9.2/MMA4VP 4.1 complex, the T g is lower than the weight average T g of the two components, while for SPS9.2/MMA4VP 9.5 and SPS9.2/MMA4VP 20.2 complexes, the T gs are higher than the weight average T gs of the corresponding components. The T g enhancement can be attributed to the physical cross linking of ionic interactions between the component polymers.

关 键 词：高分子复合物 磺化聚苯乙烯 粘度 SPS MMA4VP 

分 类 号：O633.3[理学—高分子化学] O632.52[理学—化学]