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首页> 外文期刊>Polymers for advanced technologies >Photoinduced synthesis of polyester networks from methacrylate functionalized precursors: analysis of side reactions
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Photoinduced synthesis of polyester networks from methacrylate functionalized precursors: analysis of side reactions

机译：从甲基丙烯酸酯官能化的前体光诱导合成聚酯网络：副反应分析

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摘要

Polyester networks can be prepared by ultraviolet (UV)-light-induced radical polymerization of methacrylate functionalized oligo(ε-caprolactone)s. The properties and functions of the obtained materials depend on defined network structures and may be altered, if crosslinking would occur by side reactions in other positions than the methacrylate endgroups. In order to explore whether and to which extent such side reactions occur, network synthesis as well as related model reactions were performed in the absence of photoinitiator. Hereby precursor structures (linear and four-arm star-shaped) and reaction conditions (in solution and in the melt) were varied. Unspecific side reactions were found only upon extensive UV irradiation for 60 min (26 mW cm~(-2)) with minor but detectable alterations of physicochemical properties of the networks. The analysis of model reactions suggested minor photolytic cleavage of ester bonds during polymer network synthesis. However, the effect of these side reactions on network properties and functions appeared to be less relevant than an incomplete precursor integration because of a too short UV irradiation for crosslinking.
机译：可以通过紫外线（UV）-光诱导的甲基丙烯酸酯官能化的低聚（ε-己内酯）自由基聚合反应制备聚酯网络。如果交联将在除甲基丙烯酸酯端基以外的其他位置发生副反应，则所得材料的性质和功能取决于定义的网络结构，并且可以更改。为了探讨这种副反应是否发生以及在多大程度上发生，在没有光引发剂的情况下进行了网络合成以及相关的模型反应。从而改变了前体结构（线性和四臂星形）和反应条件（在溶液中和在熔体中）。仅在广泛的紫外线照射60分钟（26 mW cm〜（-2））时发现非特异性副反应，网络的理化性质发生微小但可检测的变化。对模型反应的分析表明，在聚合物网络合成过程中，酯键发生了轻微的光解。然而，由于交联的紫外线照射时间太短，这些副反应对网络性质和功能的影响似乎比不完全的前体整合更不重要。

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