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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Different Concentrations of Glycidylisobutyl-POSS on the Glass Transition of Cured Epoxy Resin
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Influence of Different Concentrations of Glycidylisobutyl-POSS on the Glass Transition of Cured Epoxy Resin

机译：缩水甘油基异丁基-POSS的不同浓度对固化环氧树脂玻璃化转变的影响

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In this study, polyhedral oligomeric silsesquioxane glycidylisobutyl-POSS was dispersed in epoxy resin by ultrasound, and the parameters of a phantom model, the Williams-Landel-Ferry (WLF) and Vogel-Fulcher-Tammann (VFT) equations were modeled using dynamic mechanical analysis (DMA) to evaluate their influence on the glass transition state. The relaxation and retardation time distributions were estimated using a nonlinear regularization method, and the estimated physical parameters were discussed based on the results obtained from transmission electron microscopy (TEM). The TEM analysis indicated higher POSS dispersion with a spherical shape. The POSS dispersion was associated with the formation of micelles due to their hybrid character. The micelles favored the interconnections of the nodular microstructure of the epoxy thermosetting, which led to an increase in their Tg values. These interconnections increased the structure's percolation, promoted a reduction in the thermal expansion coefficient and resulted in a more homogeneous glass transition, in terms of a cooperative distribution in the relaxation times at the time scale measured. (C) 2014 Wiley Periodicals, Inc.
机译：在这项研究中，通过超声将多面体低聚倍半硅氧烷缩水甘油醚缩水甘油基异丁基-POSS分散在环氧树脂中，并使用动态力学对模型模型，Williams-Landel-Ferry（WLF）和Vogel-Fulcher-Tammann（VFT）方程的参数进行建模。分析（DMA）来评估它们对玻璃化转变状态的影响。使用非线性正则化方法估计了弛豫和延迟时间分布，并基于从透射电子显微镜（TEM）获得的结果讨论了估计的物理参数。 TEM分析表明具有较高球形的POSS分散性。由于POSS的混合特性，其与胶束的形成有关。胶束有利于环氧树脂热固性球状微结构的相互连接，从而导致其Tg值增加。这些互连增加了结构的渗透，促进了热膨胀系数的降低，并导致了在所测量的时间尺度上弛豫时间的协同分布，从而使玻璃化转变更为均匀。 （C）2014威利期刊公司

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