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首页> 外文期刊>Journal of Applied Polymer Science >A New Strategy for Controlling Shrinkage of DGEBA Resins Cured by Cationic Copolymerization with Hydroxyl-Terminated Hyperbranched Polymers and Ytterbium Triflate as an Initiator
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A New Strategy for Controlling Shrinkage of DGEBA Resins Cured by Cationic Copolymerization with Hydroxyl-Terminated Hyperbranched Polymers and Ytterbium Triflate as an Initiator

机译：控制以羟基封端的超支化聚合物和三氟乙磺酸Y为引发剂的阳离子共聚固化的DGEBA树脂收缩率的新策略

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摘要

We report a novel strategy for preparing epoxy thermosetting systems with low shrinkage and improved flexibility an degradability. Diglycidyl ether of bisphenol A (DGEBA) resin was cured with different proportions of hydroxyl-terminated hyperbranched polymer (HBP), using ytterbium triflate as a cationic initiator. The curing process was studied using differential scanning calorimetry and thermomechanical analysis. Characterization of the resulting materials was evaluated using DSC, thermogravimetric analysis, and dynamic mechanical thermal analysis, and the fracture surface was studied using scanning electron microscopy (SEM). When DGEBA is modified with HBP, it shows a homogeneous morphology and the HBP is incorporated chemically into the network, because hydroxyl groups can react with epoxides under cationic conditions. Higher proportions of HBP reduce the glass transition temperature (T-g) and thermal stability and increase the flexibility. When the proportion of HBP in the curing mixture is increased, the degree of shrinkage is reduced significantly and expansion can be observed. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2822-2829, 2009
机译：我们报告了一种制备低收缩率，改进的柔韧性和降解性的环氧热固性体系的新策略。使用三氟甲磺酸作为阳离子引发剂，用不同比例的羟基封端的超支化聚合物（HBP）固化双酚A（DGEBA）树脂的二缩水甘油醚。使用差示扫描量热法和热力学分析研究了固化过程。使用DSC，热重分析和动态机械热分析评估所得材料的特性，并使用扫描电子显微镜（SEM）研究断裂表面。当DGEBA用HBP改性时，它显示出均一的形态，并且HBP化学结合到网络中，因为羟基可以在阳离子条件下与环氧化物反应。较高比例的HBP会降低玻璃化转变温度（T-g）和热稳定性，并增加柔韧性。当HBP在固化混合物中的比例增加时，收缩程度显着降低并且可以观察到膨胀。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2822-2829，2009

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