【摘要】 采用不同相对分子质量的含端羟基超支化聚酯(H20、H30)以及端羧基改性超支化聚酯(H20-COOH)增韧邻甲酚醛环氧树脂,并考察了其含量对环氧树脂透光性、耐热性等的影响。结果表明,这3种超支化聚酯的加入均能提高环氧树脂的冲击强度和弯曲强度,并且基本不降低材料的弯曲模量;其中,加入2.5份H30的环氧树脂的冲击强度提高了90%,而H20-COOH含量为2.5份时材料的弯曲强度提高了约60%;此外,各种超支化聚酯的加入均可以保持材料的玻璃化转变温度,并可提高材料的初始分解温度。更多还原

【Abstract】 Hydroxyl-terminated hyperbranched polyester H20and H30 with different molecular weights,as well as carboxyl-terminated hyperbranched polyester H20-COOH were used for the toughening of o-cresol formaldehyde epoxy resin.It was found that all the hyperbranched polyesters could improve impact toughness and flexural strengths,and remain flexural modulus of the epoxy resin.The addition of 2.5phr H30could bring about 90%increase of impact strength, while flexural strength of epoxy resin could be raised by 60 % with 2.5phr incorporation of H20-COOH.In addition,various hyperbranched polyesters could increase the initial decomposition temperature of the material.更多还原