由特殊相互作用导致的高分子间的络合

采用结合物理老化技术的示差扫描量热法（ＤＳＣ）以及非辐射能量转移荧光光谱法（ＮＲＥＴ）研究了聚（聚乙烯－ｃｏ－４－乙烯基苯酚与聚甲基丙烯酸乙酯（ＰＥＭＡ）共混体系的相容与络合行为。对ＳＴＶＰｈ／ＰＥＭＡ共混体系，当ＳＴＶＰｈ中的ＯＨ基团含量仅为１ｍｏｌ％时，即可实现相容。随ＯＨ基含量继续增加，共混体系的Ｔｇ值上升并逐渐接近和高于Ｆｏｘ方程计算值，玻璃化转变区域逐渐变窄，ＮＲＥＴ能量转移效率远高于普

INTERMACROMOLECULAR COMPLEXATION DUE TO\=SPECIFIC INTERACTIONS\= .MISCIBILITY AND COMPLEXATION BEHAVIOR OF POLY\|\=(STYRENE\|co\|4\|VINYLPHENOL)/POLY(ETHYL METHACRYLATE) IN BULK

Miscibility and intermacromolecular complexation between poly(styrene\|co\|4\|vinylphenol)(STVPh) and poly(ethyl methacrylate)(PEMA) have been studied by means of differential scanning calorimetry (DSC) combined with physical aging and non\|radiative energy transfer (NRET) fluorospectroscopy. Toluene which is inert to hydrogen bonding, was used as the casting solvent. Only 1 mol% hydroxyl content in STVPh was found to be able torender its iscibility with PEMA. When the hydroxyl level of STVPh is progressively increased, Tgs of the blends approach and ven exceed the values calculated from Fox equation, and the transitions become narrower. Besides, in the NRET measurements, the blends show far higher energy transfer efficiency compared with the ordinary miscible blends. All these facts indicated the complex formation between the two polymers. It was also observed that the casting solvent substatially affects the miscibility and complexation. When THF was used as the casting solvent, due to its proton\ |accepting ability, it partially destroied the hydrogen bonding between STVPh and PEMA in solutions and consequently hindered the miscibility in bulk. It was found that for the THF\|cast blend, Tgs are 510K lower than those calculated from Fox equation, and the NRET efficiency is always lower than that of corresponding toluenecast ones.\=