Glass‐transition temperature governs the thermal decrosslinking behavior of Diels–Alder crosslinked polymethacrylate networks,Journal of Polymer Science Part A: Polymer Chemistry

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Glass‐transition temperature governs the thermal decrosslinking behavior of Diels–Alder crosslinked polymethacrylate networks
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2019-10-23 , DOI: 10.1002/pola.29524
Daniel J. Dobbins _{1,

2} , Georg M. Scheutz ₁ , Hao Sun ₁ , Christopher A. Crouse ₂ , Brent S. Sumerlin ₁

Affiliation

A series of Diels–Alder (DA) crosslinked polymethacrylate networks covering a broad range of glass‐transition temperatures (T_g) was prepared to establish the relationship between the T_g and the thermal decrosslinking behavior of these networks. A series of permanently crosslinked and uncrosslinked analogues were also prepared to better understand the thermoset‐to‐thermoplastic transition occurring in the DA networks at elevated temperatures. The network series were studied using dynamic mechanical analysis, which established an inverse relationship between T_g and decrosslinking ability. Differential scanning calorimetry confirmed the viability of the DA linkages in all formulations, and a trapping experiment with 9‐anthracenemethanol demonstrated that even the least responsive network was capable of undergoing decrosslinking given appropriate thermal treatment. While polymer chain mobility has long been understood to be a critical factor in healable materials, this work verifies the importance of this parameter in the decrosslinking of DA networks. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019

中文翻译：

玻璃化转变温度决定着Diels–Alder交联的聚甲基丙烯酸酯网络的热解交联行为

准备了一系列涵盖广泛玻璃化转变温度（T _g）的Diels–Alder（DA）交联聚甲基丙烯酸酯网络，以建立T _g与这些网络的热解交联行为之间的关系。还准备了一系列永久交联和未交联的类似物，以更好地理解在高温下DA网络中发生的热固性向热塑性的转变。使用动态力学分析研究了网络序列，建立了T _g与T _g之间的反比关系。和去交联能力。差示扫描量热法证实了所有配方中DA键的可行性，并且用9-蒽甲醇进行的捕集实验表明，即使是反应最差的网络，只要进行适当的热处理，也能够进行去交联。尽管长期以来人们一直将聚合物链的移动性视为可修复材料的关键因素，但这项工作验证了该参数在DA网络解交联中的重要性。©2019 Wiley Periodicals，Inc.J.Polym。科学，A部分：Polym。化学 2019年

更新日期：2019-10-24

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