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Molecular dynamic in binary mixtures and polymer blends with large difference in glass transition temperatures of the two components: A critical review
Journal of Non-Crystalline Solids ( IF 3.5 ) Pub Date : 2019-09-11 , DOI: 10.1016/j.jnoncrysol.2019.119573
K.L. Ngai , Sofia Valenti , S. Capaccioli

The dynamics in highly asymmetric mixtures with large difference in Tg of the two components are complex. At low values of the lower-Tg2 component only the α1-relaxation and its Tgα1 were found together with a fast relaxation. Three different interpretations of the fast relaxation were given. The first one interpreted the fast relaxation as the JG β-relaxation, and the α2-relaxation is present but not resolved. The second one interpreted it as localized and noncooperative α′-relaxation of the low-Tg2 component totally confined by the frozen high-Tg1 component. The third one interpreted it also as the confined α2-relaxation, but it is liquid-like and cooperative. We review exhaustively the experimental data of many highly asymmetric mixtures and polymer blends to show unequivocally that the observed fast relaxation is the JG β-relaxation. Notwithstanding, the confined-but-cooperative α2-relaxation exists, albeit not resolved. Experimental data are exclusively considered and objectively utilized to arrive at the conclusions.



中文翻译:

二元混合物和聚合物共混物中的分子动力学,且两种组分的玻璃化转变温度差异很大:严格审查

两种组分的T g差异很大的高度不对称混合物的动力学很复杂。在较低的低值Ť G2只有α1-松弛及其组成Ťα 1用快速弛豫一起发现的。给出了快速松弛的三种不同解释。第一个将快速弛豫解释为JGβ松弛,并且存在α2松弛,但没有解决。第二个解释是低T g 2成分的局限性和非合作性α'松弛完全受冷冻的高T g 1限制零件。第三者也将其解释为有限的α2松弛,但是它是液体状的并且是协作的。我们详尽地回顾了许多高度不对称混合物和聚合物共混物的实验数据,以明确表明观察到的快速弛豫是JGβ-松弛。尽管如此,尽管无法解决,但存在有限但合作的α2-松弛。专门考虑并客观地利用实验数据得出结论。

更新日期:2020-04-22
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