writer：Muxuan Li, Zhengguang Heng, Yang Chen*, Huawei Zou*, Mei Liang
keywords：PDMS-PCL diblock copolymer, Epoxy thermosets, Wormlikenanostructure, Fracture toughness
source：期刊
specific source：Industrial & Engineering Chemistry Research, 2018, 57(39): 13036-13047
Issue time：2018年

ABSTRACT: The modification of epoxy composites through the construction of nanostructures via self-organization of block copolymers has become a hot topic. In this research, high toughness epoxy thermoset was prepared through constructing wormlike-nanostructure by incorporating amphiphilic polydimethylsiloxane-block-poly(ε-caprolactone) block copolymer. The fracture toughness of subsequent epoxy thermosets increased nearly 355% comparing with neat epoxy with the addition of 40 wt.% wormlike nanostructure, which was higher than that of thermosets with spherical nanostructure (142%). There was obviously plastic deformation in fractured surfaces of thermosets with wormlike nanostructure, it is believed that a combination of several toughening mechanisms leads to the improvement in fracture toughness. The morphologies transition, dynamic mechanical properties and wetting behavior of the thermoset containing spherical/wormlike nanostructures are also reported.