In this study, a new type of prepreg technology has been established using a dual curing system consisting of 1,6-hexanediol diacrylate (HDDA) and frontally polymerisable components based on the epoxide resin. The study of the polymerisation of HDDA revealed (tert-butylcyclohexyl)peroxydicarbonate (BCPC) as the most suitable radical thermal initiator. The presence of BCPC resulted in a fast radical polymerisation of HDDA and no cationic ring-opening reaction of the epoxy, which was observed by monitoring the double bond and epoxy group conversion in real time-NIR rheology measurement. The formed prepreg can subsequently be cured by radical-induced cationic frontal polymerisation of the epoxy resin. Effects of HDDA amount on the radical polymerisation, stiffness of the gel, frontal parameters and thermal mechanical properties of final polymers were investigated. With 10 wt% HDDA, the formed prepreg has very good storage stability, which was proved by monitoring the epoxy group conversion during 4 months of storage at 50 °C while still a stable front can be obtained. Furthermore, the RICFP-prepregs with different fibre contents were prepared and polymerised by RICFP. Then, a snowflake composite was successfully produced using RICFP-prepreg.

Graphic abstract

中文翻译：

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自由基诱导的阳离子正面聚合，用于预浸料技术

在这项研究中，已经建立了一种新型的预浸料技术，它使用了一种双固化体系，该体系由1,6-己二醇二丙烯酸酯（HDDA）和基于环氧树脂的正面可聚合组分组成。HDDA聚合的研究显示（叔-丁基环己基）过氧二碳酸酯（BCPC）是最合适的自由基热引发剂。BCPC的存在导致HDDA快速自由基聚合，并且没有环氧树脂的阳离子开环反应，这是通过在实时近红外流变学测量中监测双键和环氧基团的转化来观察的。随后可以通过自由基引发的环氧树脂的阳离子正面聚合来固化形成的预浸料。研究了HDDA量对自由基聚合，凝胶刚度，正面参数和最终聚合物热机械性能的影响。使用10 wt％HDDA，形成的预浸料具有非常好的储存稳定性，这可以通过在50°C下储存4个月期间监测环氧基团转化率来证明，同时仍然可以获得稳定的前沿。此外，制备了不同纤维含量的RICFP预浸料，并通过RICFP进行了聚合。然后，使用RICFP-prepreg成功生产了雪花复合材料。

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