Effect of GO modification and curing on formation of ordered structures in epoxy composites

0547346 - ÚMCH 2023 RIV NL eng J - Journal Article
Kelnar, Ivan - Kaprálková, Ludmila - Krejčíková, Sabina - Zhigunov, Alexander - Janata, Miroslav
Effect of GO modification and curing on formation of ordered structures in epoxy composites.
Materials Letters. Roč. 308, Part A (2022), č. článku 131094. ISSN 0167-577X. E-ISSN 1873-4979
R&D Projects: GA ČR(CZ) GA19-06065S
Institutional support: RVO:61389013
Keywords : graphene oxide * bimodal grafting * epoxy
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impact factor: 3, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0167577X21017924?via%3Dihub

Modifications of GO by polymer chains may promote, in addition to exfoliation, also formation of ordered structures in epoxy. However, the contribution of self- assembly in the uncured matrix and reaction-induced phase separation to this process is not clear. SAXS study of analogous liquid and cured epoxy reveals that single grafted GO forms ordered structures only due to RIPS of grafted rubber. The marked self-assembly of bimodally grafted GO (BGO) before curing indicates that such modification changes its ordering performance substantially. Moreover, formation of ordered lamellar structures in liquid epoxy accompanied by easy migration of BGO may lead to formation of these arrays at the interface in carbon fibre composites. As a result, in-situ formation of effective nacre-like structures on the surface of CF, increasing delamination resistance, can be achieved.
Permanent Link: http://hdl.handle.net/11104/0323590