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首页> 外文期刊>Journal of Applied Polymer Science >Photocuring of Cycloaliphatic Epoxy Formulations Using Polyesters with Multiarm Star Topology as Additives
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Photocuring of Cycloaliphatic Epoxy Formulations Using Polyesters with Multiarm Star Topology as Additives

机译：使用具有多臂星形拓扑结构的聚酯作为添加剂的脂环族环氧配方的光固化

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摘要

Multiam star polyesters were synthesized by growing poly(e-caprolactone) (PCL) arms from hyperbranched polyesters cores of different molecular weight and used as polymeric modifiers in UV-curable cationic formulations based on a biscycloaliphatic epoxy resin. The effect of the multiarm stars on the curing kinetics has been investigated by real-time FTIR. The thermal-mechanical properties of the photocured thermosets have been studied with calorimetry and dynamomechanical and thermogravimetric analysis. Impact strength tests have been performed to assess their effect on the toughness of the cured materials. An accelerative effect of these modifiers has been observed as a consequence of the participation of the hydroxyl groups of the modifiers in the cationic curing of the epoxy resin. A modest increase in toughness accompanied by a decrease in the glass transition are observed, as a consequence of the incorporation of the modifiers into the network structure, leading to homogeneous, in situ reinforced materials.
机译：通过从不同分子量的超支化聚酯核中生长聚（ε-己内酯）（PCL）臂来合成Multiam星型聚酯，并将其用作基于双环脂族环氧树脂的可紫外光固化的阳离子配方中的聚合物改性剂。实时FTIR研究了多臂恒星对固化动力学的影响。已通过量热法，动力力学和热重分析法研究了光固化热固性塑料的热机械性能。已经进行了冲击强度测试以评估其对固化材料的韧性的影响。由于改性剂的羟基参与环氧树脂的阳离子固化，已经观察到这些改性剂的促进作用。由于将改性剂掺入到网状结构中，导致韧性适度增加，同时玻璃化转变降低，从而导致均匀的原位增强材料。

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