[Polymer] Self-toughening of Epoxy Resin through Controlling Topology of Cross-linked Networks
writer：Nan Tian, Rongchang Ning and Jie Kong*
keywords：Epoxy; Toughness; Network topology, Branched
source：期刊
specific source：Polymer, 2016, 99, 376-385
Issue time：2016年
Nan Tian, Rongchang Ning and Jie Kong*, Self-toughening of Epoxy Resin through Controlling Topology of Cross-linked Networks, Polymer, 2016, 99, 376-385
http://www.sciencedirect.com/science/article/pii/S0032386116306048
(1) The toughness of epoxy resin be improved directly by controlling the topological structure of crosslinking network is studied.
(2) Chain transfer can be used to control the topology of epoxy network when crosslinking proceeds through chain-wise polymerization.
(3) In anionic ring-opening polymerization, the active alkoxide anions transforms into inactive hydroxyls after chain transfer, leading to lower crosslinking density.
(4) The enhancement of toughness shows a close relation to the bimodal distribution of crosslinking density.
(5) The free volume fraction from positrons lifetime spectrum keeps nearly constant, even the toughness of epoxy resin is enhanced significantly.