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Curing kinetics of acrylate-based and 3D printable IPNs
Thermochimica Acta ( IF 3.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.tca.2020.178754
Osman Konuray , José M. Salla , José M. Morancho , Xavier Fernández-Francos , Montserrat García-Alvarez , Xavier Ramis

Abstract In this work, the kinetics of curing of a new family of interpenetrating polymer networks (IPNs) obtained by co-formulation of a photocurable acrylic resin with a thermocurable epoxy/anhydride mixture is studied. The first curing stage is an acrylate free-radical photopolymerization at ambient temperature, and the second curing stage is an epoxy-anhydride copolymerization initiated with a nucleophilic tertiary amine at higher temperatures. The presence of a diperoxyketal thermal radical initiator added to the liquid formulation facilitates uniform and complete acrylate conversion during thermal second curing stage and opens the possibility of curing the same materials by thermal curing only. The thermal curing kinetics was studied by integral isoconversional and model fitting procedures, whereas photocuring kinetics was satisfactorily fitted to a first order expression. Thermal curing and storage stability at room temperature were successfully simulated by using the isoconversional kinetic parameters. These ternary formulations have potential as 3D printable thermosets.

中文翻译:

丙烯酸酯基和 3D 可打印 IPN 的固化动力学

摘要 在这项工作中,研究了通过共同配制光固化丙烯酸树脂与热固化环氧树脂/酸酐混合物获得的新型互穿聚合物网络 (IPN) 家族的固化动力学。第一固化阶段是在环境温度下丙烯酸酯自由基光聚合,第二固化阶段是在较高温度下用亲核叔胺引发的环氧-酸酐共聚。添加到液体配方中的双过氧缩酮热自由基引发剂的存在促进了在第二次热固化阶段丙烯酸酯的均匀和完全转化,并开启了仅通过热固化固化相同材料的可能性。通过积分等转化和模型拟合程序研究了热固化动力学,而光固化动力学令人满意地符合一级表达式。通过使用等转化动力学参数成功地模拟了室温下的热固化和储存稳定性。这些三元配方具有作为 3D 可打印热固性材料的潜力。
更新日期:2020-10-01
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