Poly (propylene carbonate)-based in situ nanofibrillar biocomposites with enhanced miscibility, dynamic mechanical properties, rheological behavior and extrusion foaming ability
Poly (propylene carbonate)-based in situ nanofibrillar biocomposites with enhanced miscibility, dynamic mechanical properties, rheological behavior and extrusion foaming ability
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聚（碳酸丙烯酯）基原位纳米纤维生物复合材料，具有增强的混溶性、动态机械性能、流变行为和挤出发泡能力
DOI：
10.1016/j.compositesb.2017.05.015
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发表时间：
2017-08-15
影响因子：
13.1
通讯作者：
Peng, Xiangfang
中科院分区：
文献类型：
--
作者：
Kuang, Tairong;Li, Kaican;Peng, Xiangfang
聚碳酸亚丙酯(PPC)泡沫塑料由于其可生物降解性和固定二氧化碳(CO2)的能力，近年来受到越来越多的关注。尽管PPC具有许多吸引人的特点，但其相对较低的分解温度、较低的玻璃化转变温度(Tg)、较弱的力学性能和较差的熔体强度限制了它们作为传统塑料的可行候选材料的商业应用。在本研究中，我们报道了一种简便、有效、低成本和环保的方法来制备PPC/PBS/PTFE三元原位纳米纤维生物复合材料，以显著提高PPC的强度和发泡能力，而不牺牲其优异的生物降解性。PPC/PBS复合材料中原位生成的纳米纤维网络表明，当PTFE含量较低时，增强效果显著提高了复合材料的强度、动态力学性能和流变性能。与纯PPC相比，Tg提高了15℃，储能模数提高了851%，初始粘度提高了17倍。在连续挤出发泡过程中，PbS结构域和PTFE纳米纤维网络对发泡行为产生了显著的协同作用，使PPC/PBS/PTFE(70/3013)生物复合材料的泡孔密度(两个数量级)、压缩弹性系数(30倍)和压缩强度(20倍)都得到了提高。(C)2017爱思唯尔有限公司。保留所有权利。
Poly (propylene carbonate) (PPC) foams have attracted more attention in recent years because of their biodegradability and the fixation of carbon dioxide (CO2). Despite their many attractive features, a relatively low decomposition temperature, a low glass transition temperature (Tg), weak mechanical properties and poor melt strength of PPC matrix limited their commercial applications as a viable candidate for conventional plastics. In this study, we report a facile, effective, low-cost and eco-friendly approach for the preparation of PPC/PBS/PTFE ternary in situ nano-fibrillar biocomposites to significantly improve the strength and foaming ability of PPC without sacrificing their excellent biodegradability. The in situ nano-fibrillar networks in the PPC/PBS matrix demonstrated that significant reinforcement effects on the matrix strength, dynamic mechanical and rheological properties at low PTFE contents. In contrast to pure PPC, Tg increased by 15 degrees C, 851% higher in storage modulus and 17 times enhancement in the initial viscosity of biocomposites. In continues extrusion foaming process, the PBS domains and PTFE nano-fibrils network generated remarkable synergistic effects on the foaming behavior, resulted in higher cell densities (two orders of magnitude), compressive modulus (30 times) and compressive strength (20 times) of PPC/PBS/PTFE (70/3013) biocomposites. (C) 2017 Elsevier Ltd. All rights reserved.