Hyperbranched epoxy resins (HERs) has attracted much interesting due to improving homogeneously the ductility and strength of popular diglycidyl ether of bisphenol-A (DGEBA), but the preparation of HERs/DGEBA composites with low-temperature resistance and rapid degradation is still a challenge in the sustainable development of thermoset field. Here we represent self-curable hyperbranched epoxy resins (DSEHP-n, n = 3, 5, 7, 11) to modify DGEBA. DSEHP-n not only increase simultaneously the tensile strength, flexural strength, impact strength, modulus, and elongation by 64.8%, 38.1%, 93.7%, 70.4%, and 50%, respectively, and but also improve remarkably the low-temperature resistance and degradation degree. The improvement of mechanical properties is caused by the combined effect of crosslinking density, free volume, intermolecular cavity, hyperbranched topological structure and good compatibility, account of an in-situ reinforcing and toughening mechanism which substantiated by dynamic light scattering (DLS), SEM, DMA, and free volume analysis. The detailed analysis of degradation products from GC-MS spectra showed that the degradation of the composites was attributed to the cleavage of the C–N and ester bonds. This paper will bring a novel method to prepare highly-efficient degradable thermoset and composites.

超支化环氧树脂（HERs）由于均匀地提高了双酚A（DGEBA）流行的二缩水甘油醚的延展性和强度而备受关注，但是制备耐低温和快速降解的HERs / DGEBA复合材料仍然是一个挑战。在热固性塑料领域的可持续发展。在这里，我们代表了可改性DGEBA的自固化超支化环氧树脂（DSEHP-n，n = 3、5、7、11）。DSEHP-n不仅可以同时使拉伸强度，弯曲强度，冲击强度，模量和伸长率分别提高64.8％，38.1％，93.7％，70.4％和50％，而且还可以显着提高耐低温性和降解程度。机械性能的提高是由于交联密度，自由体积，分子间空腔，超支化的拓扑结构和良好的相容性，这归因于原位增强和增韧机制，该机制通过动态光散射（DLS），SEM，DMA和自由体积分析得到证实。通过GC-MS光谱对降解产物进行的详细分析表明，复合材料的降解归因于CN和酯键的裂解。本文将提出一种制备高效可降解热固性塑料和复合材料的新方法。