正丁酸封端的超支化聚酯改性环氧树脂的性能研究

Properties study on epoxy resin modified by hyperbranched polyester of butyric acid blocking

设计并合成了一种以正丁酸为柔性链封端的超支化聚酯树脂(flexible chain blocking hyperbranched polyester,FCBHBP),并用其改性环氧酸酐树脂,结果表明,FCBHBP对环氧树脂具有增韧、降低介电常数和介电损耗的作用。通过核磁谱图(NMR)和傅里叶红外光谱图(FT-IR)表征FCBHBP分子的超支化结构;通过力学性能测试发现FCBHBP对环氧酸酐固化物有明显的增韧作用,当FCBHBP用量为环氧树脂的20%(质量分数)时,改性的环氧酸酐固化物的冲击和弯曲强度分别为未改性环氧酸酐固化物的160%和117%;通过介电性能测试发现,FCBHBP可以利用自由体积降低环氧树脂介电常数,同时可以利用柔性链与环氧树脂中极性官能团的相互作用在一定频率内降低介电损耗。

Flexible chain blocking hyperbranched polyester（FCBHBP）was designed and synthesized by butyric acidterminated and used to modify epoxy anhydride resin.The molecular structure of FCBHBP was characterized by NMR and FT-IR.And the influences of the amount of FCBHBP on the performances of epoxy resin werestudied.According to the test of mechanical properties,FCBHBP could improve the toughness of epoxy resin by increasing the free volume and chain winding double effects.When the dosage was 20wt%of epoxy resin,the impact strength and bending strength were 160%and 117%as unmodified sample.The FCBHBP could reduce the dielectric constant of the epoxy resin by using free volume as shown in dielectric performance testing and the dielectric loss in a certain frequency withthe interaction between polar groups from the epoxy resin and flexible chains from FHBP.