Thermal properties of bismaleimide-triazine/glass fiber composites modified by polyethylene glycol

Abstract

It is an effective method that the toughness of polymer-based glass fiber composites is improved by polyethylene glycol (PEG). However,the soft segments of PEG molecular structure have an influence on the thermal properties of composites. In this work,bismaleimide-triazine/glass fiber composites modified by PEG were prepared. The effects of molecular chain length and mounts of PEG on the thermal properties of composites were investigated. The results showed that adding PEG leads to decreases of glass-transition temperature,temperature for the total mass loss of 5%,and the char yield at 800 ℃. There is the highest value of thermal properties,when the molecular weight reaches 4000. Further,the thermal properties of the composites decreased with the increase of PEG amount. The micro-structure analysis showed that the enhanced interface bonding force among PEG,BT resin,and glass fiber are beneficial to the thermal properties,which relaxes the decreased tendency of thermal properties. These results provide a reference for improving the toughness of polymer-based glass fiber using PEG.