具有高效韧性增强的环保型环氧封端聚氨酯改性环氧树脂

Eco-Friendly Epoxy-Terminated Polyurethane-Modified Epoxy Resin with Efficient Enhancement in Toughness.

作者信息

Zhang Kun, Huang Jinrui, Wang Yigang, Li Wenbin, Nie Xiaoan

机构信息

Key Laboratory of Biomass Energy and Material, Jiangsu Province, Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center for Low-Carbon Processing and Utilization of Forest Biomass, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China.

出版信息

Polymers (Basel). 2023 Jun 24;15(13):2803. doi: 10.3390/polym15132803.

DOI:10.3390/polym15132803

PMID:37447449

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10346895/

Abstract

Polyurethane is widely used to toughen epoxy resins due to its excellent comprehensive properties and compatibility. However, some demerits of polyurethanes limit their applications, such as the harsh storage condition of isocyanate-terminated polyurethane (ITPU), the limited amount of ITPU in epoxy resin, and using solvents during the preparation of polyurethane-modified epoxy resins. To address these issues, in this study, we reported a facile and green approach for preparing epoxy-terminated polyurethane (EPU)-modified epoxy resins with different EPU contents. It was found that the toughness of the epoxy resin was significantly improved after the addition of EPU. When the EPU content was 30 wt%, the elongation at break and toughness were improved by 358.36% and 73.56%, respectively. In comparison, the toughening effect of EPU outperformed that of ITPU. Moreover, the high content of EPU did not significantly decrease the glass transition temperature and had little effect on the thermal stability of the epoxy resin.

摘要

聚氨酯因其优异的综合性能和相容性而被广泛用于增韧环氧树脂。然而，聚氨酯的一些缺点限制了它们的应用，例如异氰酸酯封端聚氨酯（ITPU）苛刻的储存条件、环氧树脂中ITPU的用量有限以及在制备聚氨酯改性环氧树脂过程中使用溶剂。为了解决这些问题，在本研究中，我们报道了一种简便、绿色的方法来制备具有不同EPU含量的环氧封端聚氨酯（EPU）改性环氧树脂。研究发现，添加EPU后环氧树脂的韧性显著提高。当EPU含量为30 wt%时，断裂伸长率和韧性分别提高了358.36%和73.56%。相比之下，EPU的增韧效果优于ITPU。此外，高含量的EPU并没有显著降低玻璃化转变温度，并且对环氧树脂的热稳定性影响很小。