A novel chain-extended urea containing hyperbranched polymer used as toughening modifier for epoxy resin
(1.Department of Material and Chemical Engineering, Guilin University of Technology,Guilin 541004, China2.Key Laboratory of Nonferrous Metal Materials and New Processing Technology Ministry of Education, Guilin University of Technology, Guilin 541004, China)
Abstract: A new kind of reactive toughening accelerator for epoxy resin, amine-teminated hyperbranched polymer (H2O？NMe2) was synthesized and characterized by FT-IR spectroscopy. Dynamic mechanical analysis (DMA) was used to study the glass transition temperature (Tg), loss factor (tanδ) and activation energy (Ea) by using multiplexing frequency. The results show that the Ea at glassy relaxation process of modified system is about 70-80 kJ/mol higher than that of unmodified system, and the high modulus and good thermal properties are still maintained.
Key words: epoxy resin; hyperbranched polymer; multiplexing frequency mode; toughening; chain-extended urea