Dynamic Heterogeneity and Phase Separation Kinetics in Miscible Poly(vinyl acetate)/Poly(ethylene oxide) Blends by Local Dielectric Spectroscopy
作者： Tomas P. Corrales , David Laroze , George Zardalidis , George Floudas , Hans-Jürgen Butt
DOI: 10.1021/MA4007158
关键词: Dielectric spectroscopy 、 Ethylene oxide 、 Polymer chemistry 、 Oxide 、 Vinyl acetate 、 Kinetics 、 Chemical engineering 、 Annealing (metallurgy) 、 Materials science 、 Glass transition 、 Phase (matter)
摘要: 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 glass transition temperatures. aim study dynamic heterogeneity in films as a function film thickness. Measurements local composition at nanoscale shown that LDS is sensitive heterogeneity. In thinner films, phase segregation occurs, kinetics demixing studied using probe change composition. These results open new possibilities for studying interdiffusion adhesion polymer–polymer interfaces annealing temperature with LDS.
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