Photopolymerization of (meth)acrylates into highly crosslinked networks is in general accompanied by volumetric shrinkage, often leading to premature material failure. In this work, thermoreversible Diels–Alder groups are investigated to explore their effect on material lifetime. A difunctional acrylic monomer containing Diels–Alder moieties is synthesized and successfully incorporated in a polymer network by photopolymerization. It is demonstrated that upon heating above 150 °C, the Diels–Alder bonds open, yielding topological rearrangements of the network. The mechanical properties of the material after opening of the Diels–Alder moieties are investigated by tensile testing, showing a high strain‐rate dependence of the yield stress which is indicative of a longer lifetime at the higher strain rates that are prevalent in load‐bearing applications.

中文翻译：

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热可逆Diels-Alder键含丙烯酸酯网络使用寿命更长

（甲基）丙烯酸酯光聚合成高度交联的网络通常伴随着体积收缩，通常导致材料过早失效。在这项工作中，对热可逆Diels–Alder组进行了研究，以探讨它们对材料寿命的影响。合成了一种含有Diels-Alder部分的双官能丙烯酸单体，并通过光聚合成功地掺入了聚合物网络中。结果表明，加热到150°C以上时，狄尔斯-阿尔德键打开，从而产生网络的拓扑重排。通过拉伸试验研究了在Diels–Alder部分打开后材料的机械性能，显示了屈服应力的高应变率依赖性，这表明在较高的应变率下寿命更长，这在承载中很普遍应用程序。