Carsi Marta, Sanchis Maria J, Gómez Clara M, Rodriguez Sol, G Torres Fernando
Department of Applied Thermodynamics, Instituto de Automática e Informática Industrial, Universitat Politècnica de Valencia, 46022 Valencia, Spain.
Department of Applied Thermodynamics, Instituto de Tecnología Eléctrica, Universitat Politècnica de València, 46022 Valencia, Spain.
Polymers (Basel). 2019 Jun 25;11(6):1083. doi: 10.3390/polym11061083.
Films of carrageenan (KC) and glycerol (g) with different contents of chitin nanowhiskers (CHW) were prepared by a solution casting process. The molecular dynamics of pure carrageenan (KC), carrageenan/glycerol (KCg) and KCg with different quantities of CHWs as a filler was studied using dielectric relaxation spectroscopy. The analysis of the CHW effect on the molecular mobility at the glass transition, , indicates that non-attractive intermolecular interactions between KCg and CHW occur. The fragility index increased upon CHW incorporation, due to a reduction in the polymer chains mobility produced by the CHW confinement of the KCg network. The apparent activation energy associated with the relaxation dynamics of the chains at slightly increased with the CHW content. The filler nature effect, CHW or montmorillonite (MMT), on the dynamic mobility of the composites was analyzed by comparing the dynamic behavior of both carrageenan-based composites (KCg/CHW, KCg/MMT).
通过溶液浇铸法制备了含有不同含量甲壳素纳米晶须（CHW）的角叉菜胶（KC）和甘油（g）薄膜。使用介电弛豫光谱研究了纯角叉菜胶（KC）、角叉菜胶/甘油（KCg）以及添加不同量CHW作为填料的KCg的分子动力学。对CHW在玻璃化转变温度下对分子流动性的影响进行分析，结果表明KCg与CHW之间存在非吸引性分子间相互作用。由于CHW对角叉菜胶网络的限制导致聚合物链流动性降低，加入CHW后脆性指数增加。与链在玻璃化转变温度下的弛豫动力学相关的表观活化能随CHW含量略有增加。通过比较两种基于角叉菜胶的复合材料（KCg/CHW、KCg/蒙脱石（MMT））的动态行为，分析了填料性质（CHW或蒙脱石（MMT））对复合材料动态流动性的影响。
