Dual effects of mesoscopic fllers on the polyethersulfone modified cyanate ester: enhanced viscoelastic effect and mechanical properties
作者：Zhongnan Hu, Jie Zhang, Huiping Wang, Tian Li, Zhuoyu Liu and Yingfeng Yu*
關鍵字：Cyanate ester, mesoscopic ?llers, phase separation, viscoelasticity
論文來源：期刊
具體來源：RSC ADVANCES, 2014, 4(66): 34927-37
發表時間：2014年
Phase separation and viscoelastic effect play
important roles in the properties of mesoscopic fillers reinforced
polyethersulfone/cyanate ester composites. In this article, the effects of size
and content of mesoscopic fillers on the polymerization induced viscoelastic
phase separation of thermoplastic modified thermosets have been studied by
using optical
microscopy (OM), time-resolved light scattering (TRLS) and rheological instrument. The results of OM and TRLS
showed that the characteristic length scale of phase structure of fillers added
systems tended to shrink; while the relaxation time of phase separation increased with the decrease of
filler size and enlargement of filler content. Rheological behaviours of blends filled with
various types and contents of mesoscopic fillers are consistent with the phase
separation process. The
change of morphology and phase separation process was attributed to the significant enhanced viscoelastic effect of mesoscopic fillers. Both the tensile
properties and toughness of cyanate ester blends have been improved due to the “enhanced
viscoelastic effect” through addition of mesoscopic fillers. However, the “enhanced
viscoelastic effect” of fillers almost disappeared with the diminishing of
viscoelastic effect during phase separation.