Kinetics of phase separation of Nafion perfluorinated ionomer and poly(vinylidene fluoride) blends
Kinetics of phase separation of Nafion perfluorinated ionomer and poly(vinylidene fluoride) blends
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Nafion 全氟离聚物和聚偏氟乙烯共混物的相分离动力学
DOI：
10.1021/ma00203a032
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发表时间：
1990
期刊：
影响因子：
5.5
通讯作者：
T. Kyu
中科院分区：
文献类型：
--
作者：
J. Yang;T. Kyu
Nafion与聚偏氟乙烯(PVDF)共混物在PVDF晶体熔融温度以上观察到液-液分离现象。用时间分辨小角光散射法研究了Nafion/PVDF共混物的热诱导相分离动力学。在浊点测定的基础上建立了温度-组成相图。相行为为低临界溶解温度(LCST)型，具有可逆性。从室温到220℃和240℃进行了温度跳跃(T-JUMP)实验，相分离以调幅分解的后期阶段为主。在非线性理论和动态标度律的背景下，分析了散射曲线的时间演化。
Liquid-liquid phase separation was observed in the blends of Nafion and poly (vinylidene fluoride)(PVDF) above thecrystal melting temperature of PVDF crystals. The kinetics of thermally induced phase separation in Nafion/PVDF blends was investigated by means of time-resolved small-angle light scattering. A temperature-composition phase diagram was established on the basis of cloud point mea-surements. The phase behavior is a lower critical solution temperature (LCST) type and reversible in character. Temperature-jump (T-jump) experiments were undertaken from room temperature to 220 and 240 C. Phase separation was dominated by the late stages of spinodal decomposition. The time evolu-tion of scattering curves was analyzed in thecontext of nonlinear theoriesand dynamic scaling laws.