Dynamic Heterogeneity and Phase Separation Kinetics in Miscible Poly(vinyl acetate)/Poly(ethylene oxide) Blends by Local Dielectric Spectroscopy
Dynamic Heterogeneity and Phase Separation Kinetics in Miscible Poly(vinyl acetate)/Poly(ethylene oxide) Blends by Local Dielectric Spectroscopy
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DOI：
10.1021/ma4007158
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发表时间：
2013-09
期刊：
影响因子：
5.5
通讯作者：
T. Corrales;D. Laroze;G. Zardalidis;G. Floudas;H. Butt;M. Kappl
中科院分区：
文献类型：
--
作者：
T. Corrales;D. Laroze;G. Zardalidis;G. Floudas;H. Butt;M. Kappl
采用局域介电谱（LDS）对聚醋酸乙烯酯（PVAc）和聚环氧乙烷（PEO）共混体系进行了研究。这两种均聚物具有非常不同的弛豫时间和玻璃化转变温度。目的是研究薄膜中的动态不均匀性作为薄膜厚度的函数。在纳米尺度下的局部共混组合物的测量表明LDS对动态异质性敏感。在较薄的薄膜中，发生相分离，和相分层的动力学进行了研究，作为探针的局部组成的变化。这些结果打开了新的可能性，研究相互扩散和粘附在聚合物-聚合物界面作为退火温度与LDS的函数。
Local dielectric spectroscopy (LDS) was employed to analyze the miscible blend composed of poly(vinyl acetate) (PVAc) and poly(ethylene oxide) (PEO). The two homopolymers have very different relaxation times and glass transition temperatures. The aim was to study the dynamic heterogeneity in films as a function of the film thickness. Measurements of the local blend composition at the nanoscale have shown that LDS is sensitive to the dynamic heterogeneity. In thinner films, phase segregation occurs, and the kinetics of phase demixing was studied using as a probe the change in local composition. These results open new possibilities for studying interdiffusion and adhesion at polymer–polymer interfaces as a function of annealing temperature with LDS.