Study on phase morphology and mechanical properties of polyethersulfone modified bismaleimide resin
writer：Xiaoyun Liu, Guozhu Zhan, Zhewen Han, Shanjun Li, YingFeng Yu
keywords：mechanical properties，morphology，phase separation，poly(ether sulfones)，thermosets
source：期刊
specific source：Journal of applied polyner science, 2007, 106: 77-83
Issue time：2007年
The polymerization-induced phase-separation behavior of a thermoplastic [poly(ether sulfone) (PES)]- modified thermosetting bismaleimide resin during isothermal curing was investigated with differential scanning calorimetry, time-resolved light scattering, and scanning electron microscopy with various contents and molecular weights of PES. The results suggested that the phase structure changed from a dispersed structure to a bicontinuous structure to phase inversion with an increase in the PES content. Three kinds of PES with different molecular weights were used to study the effects of the molecular weight on the phase structure and mechanical properties of modified systems. With higher molecular weight PES, a phase-inversion morphology could be obtained at lower PES contents. The curing conversion of bismaleimide was affected by the composition of the blend. The curing rate decreased with an increase in the PES content. A blend with 15 wt % PES of a suitable molecular weight had a higher tensile strength and elongation at break than that without PES.