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经过共聚改性的含羟基聚苯乙烯PS(OH)可以和许多含质子接受基团的聚合物形成氢键而成为互溶体系,本文着重研究这类含氢键共混体系的相分离动力学以及它们的相图。PS(OH)是由苯乙烯与对-六氟异丙醇-α-甲基苯乙烯共聚得到。它与聚甲基丙烯酸丁酯PBMA组成的共混物用温度跃变光散射法研究分相动力学行为。分相初期,符合Cahn-Hilliard-Cook线性理论,共混物具有LCST性质。由于PS(OH)中只含有1.5mol%OH基团,使得共聚物的组成不均匀,以及PS(OH)和PBMA的分子量多分散性,导致共混物的临界共溶点不在亚稳单相极限线(Spinodal curve)和稳定单相极限线(Binodal Curve)的最低点。对于临界组成的共混物在分相后期相区的增长按Siggia模型进行。而非临界组成的共混物按Lifshitz-Slyozov模型进行而且散射光强I(q,t)随散射矢量q的变化出现与q无关的峰,这与金属氧化物的共混物有类似的情况。
The copolymerization-modified polystyrene-containing PS (OH) can form hydrogen bond with many proton-accepting polymers to form a mutual solubility system. This thesis focuses on the phase separation kinetics of such hydrogen-containing bond systems and Their phase diagram. PS (OH) is derived from the copolymerization of styrene with p-hexafluoroisopropanol-α-methylstyrene. Its blend with polybutylmethacrylate PBMA was used to study the kinetics of phase separation by temperature-jump light scattering. In the early phase, Cahn-Hilliard-Cook linear theory was followed and the blend had LCST properties. Because PS (OH) contains only 1.5mol% OH groups, the composition of the copolymer is not uniform, and the molecular weight polydispersity of PS (OH) and PBMA results in that the critical co-melt point of the blend is not in the metastable single phase The lowest point of the Spinodal curve and the stable Binodal Curve. The growth of the critical phase blend in the late phase phase was performed according to the Siggia model. The noncritical blends were performed according to the Lifshitz-Slyozov model and the change of the scattered light intensity I (q, t) with respect to the scattering vector q showed peaks unrelated to q, similar to the case of metal oxide blends .