A new route to nanostructured thermosets with block ionomer complexes

Wu, Shuying, Peng, Shuhua, Hameed, Nishar, Guo, Qipeng and Mai, Yiu-Wing 2012, A new route to nanostructured thermosets with block ionomer complexes, Soft matter, vol. 8, no. 3, pp. 688-698.

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Title A new route to nanostructured thermosets with block ionomer complexes
Author(s) Wu, Shuying
Peng, Shuhua
Hameed, Nishar
Guo, Qipeng
Mai, Yiu-Wing
Journal name Soft matter
Volume number 8
Issue number 3
Start page 688
End page 698
Total pages 11
Publisher Royal Society of Chemistry
Place of publication Cambridge, U. K.
Publication date 2012-01
ISSN 1744-683X
1744-6848
Keyword(s) block ionomers
caprolactone
cured epoxy
curing agents
diglycidyl ether of bisphenol-A
epoxy thermosets
methylene dianiline
micro-domains
nano-structured
phase forms
side-chains
sulfonated polystyrene
Summary We report a novel approach to prepare nanostructured thermosets using block ionomer complexes. Neither block copolymer polystyrene-block-poly(ethylene-ran- butylene)-block-polystyrene (SEBS) nor block ionomer sulfonated SEBS (SSEBS) is miscible with diglycidyl ether of bisphenol A (DGEBA) type epoxy resin. It is thus surprising that the block ionomer complex of SSEBS with a tertiary amine-terminated poly(3-caprolactone) (PCL), denoted as SSEBS-c-PCL, can be used to prepare nanostructured epoxy thermosets. The block ionomer complex SSEBS-c-PCL is synthesized via neutralization of SSEBS with 3-dimethylamino- propylamine-terminated PCL. Sulfonation of SEBS yields the block ionomer SSEBS which is immiscible with epoxy. But the block ionomer complex SSEBS-c-PCL can be easily mixed with DGEBA. When the curing agent 4,4'-methylenedianiline (MDA) is added and the epoxy cures, the system retains the nanostructure. In cured epoxy thermosets containing up to 30 wt% SSEBS-c-PCL, the exclusion of the poly(ethylene-ran-butylene) (EB) phase forms spherical micro-domains surrounded by separated sulfonated polystyrene phase while the PCL side-chains of SSEBS-c-PCL are dissolved in the cured epoxy matrix. The spherical micro-domains are highly aggregated in the epoxy thermosets containing 40 and 50 wt% SSEBS-c-PCL. The existence of epoxy-miscible PCL side-chains in the block ionomer complex SSEBS-c-PCL avoids macro-phase separation. Hence, the block ionomer complex can act as an efficient modifier to achieve nanostructured epoxy thermosets.
Language eng
Field of Research 091209 Polymers and Plastics
091202 Composite and Hybrid Materials
030304 Physical Chemistry of Materials
Socio Economic Objective 860606 Plastics in Primary Forms
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, The Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044323

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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