Hu Jingyuan, Zhang Liyue, Chen Mingxuan, Dai Jinyue, Teng Na, Zhao Hongchi, Ba Xinwu, Liu Xiaoqing
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Key Laboratory of Chemical Biology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
Polymers (Basel). 2023 Jan 14;15(2):449. doi: 10.3390/polym15020449.
To overcome the high flammability and brittleness of epoxy resins without sacrificing their glass transition temperature () and mechanical properties, three epoxy-terminated hyperbranched flame retardants (EHBFRs) with a rigid central core and different branches, named EHBFR-HB, EHBFR-HCM, and EHBFR-HBM, were synthesized. After chemical structure characterization, the synthesized EHBFRs were introduced into the diglycidyl ether of bisphenol A (DGEBA) and cured with 4, 4-diaminodiphenylmethane (DDM). The compatibility, thermal stability, mechanical properties, and flame retardancy of the resultant resins were evaluated. Results showed that all three EHBFRs could significantly improve the fire safety of cured resins, and 30 wt. % of EHBFRs (less than 1.0 wt. % phosphorus content) endowed cured DGEBA with a UL-94 V-0 rating. In addition, the increased rigidity of branches in EHBFRs could increase the flexural strength and modulus of cured resins, and the branches with appropriate rigidity were also beneficial for improving their room temperature impact strength and .
为了在不牺牲环氧树脂玻璃化转变温度（）和机械性能的前提下克服其高易燃性和脆性，合成了三种具有刚性中心核和不同支链的环氧封端超支化阻燃剂（EHBFRs），分别命名为EHBFR-HB、EHBFR-HCM和EHBFR-HBM。在进行化学结构表征后，将合成的EHBFRs引入双酚A二缩水甘油醚（DGEBA）中，并用4,4-二氨基二苯甲烷（DDM）进行固化。对所得树脂的相容性、热稳定性、机械性能和阻燃性进行了评估。结果表明，所有三种EHBFRs均可显著提高固化树脂的消防安全性能，30 wt.%的EHBFRs（磷含量低于1.0 wt.%）可使固化后的DGEBA达到UL-94 V-0等级。此外，EHBFRs中支链刚性的增加可提高固化树脂的弯曲强度和模量，具有适当刚性的支链也有利于提高其室温冲击强度和。
