超支化聚苯醚对双酚A型环氧树脂的低介电改性

自制了一种反应型端环氧基超支化聚苯醚(EHPPO)，将其添加到双酚A型环氧树脂中进行改性并用酸酐固化剂固化，表征了固化样品的热性能、力学性能和介电性能。此外还使用分子主链结构相同、端基为非反应型苄基的超支化聚苯醚(CHPPO)进行了对比改性研究。结果表明，两种不同的改性剂对双酚A型环氧树脂的改性效果各有优势，其中，使用EHPPO改性得到的环氧树脂具有更加优异的热性能和拉伸强度，而由CHPPO改性的环氧树脂介电常数相对更低。

Low dielectric constant modification of bisphenol A diglycidyl ether with hyperbranched poly (phenylene oxide)

A reactive epoxidized hyperbranched poly(phenylene oxide) (EHPPO) was added to the diglycidyl ether of bisphenol A (DGEBA) to form a hybrid which was cured with methyl-5-norbornene-2,3-dicarboxylic anhydride (methyl nadic anhydride) in order to improve its thermal and dielectric properties. The thermal and dielectric properties of the cured hybrid were investigated. In addition, as a non-reactive modifier, benzyl-capped hyperbranched poly(phenylene oxide) (CHPPO) was prepared and added to DGEBA for comparison. The results showed that addition of EHPPO and CHPPO can improve both thermal and dielectric properties of DGEBA. Hybrids with EHPPO have much higher glass transition temperature and better thermal stability than those with CHPPO, whereas, DGEBA/CHPPO hybrids have lower dielectric constants than DGEBA/EHPPO hybrids.