ORCID Profile
0000-0002-4515-7701
Current Organisations
CSIRO Australian Manufacturing and Materials Precinct
,
CSIRO
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Publisher: Elsevier BV
Date: 2017
Publisher: IOP Publishing
Date: 04-05-2007
Publisher: Wiley
Date: 24-01-2014
DOI: 10.1002/APP.40416
Publisher: Elsevier BV
Date: 11-2005
Publisher: American Chemical Society (ACS)
Date: 24-01-2020
DOI: 10.1021/ACS.BIOMAC.9B01743
Abstract: We report here the synthesis of a series of ethylene glycol-based triblock copolymers containing a hydrophilic middle segment of poly(ethylene glycol) methyl ether methacrylate (PEGMA) and two temperature-responsive segments of diethylene glycol methyl ether methacrylate (DEGMA) at both ends via the reversible addition-fragmentation chain-transfer (RAFT) polymerization. While the corresponding temperature-responsive homopolymer (PDEGMA) and the diblock copolymer (PDEGMA-
Publisher: American Chemical Society (ACS)
Date: 20-06-2017
Publisher: American Chemical Society (ACS)
Date: 13-07-2016
Publisher: American Chemical Society (ACS)
Date: 21-01-2015
DOI: 10.1021/JP510603Q
Publisher: Wiley
Date: 22-11-2004
DOI: 10.1002/PI.1324
Publisher: Wiley
Date: 11-04-2007
Publisher: SAGE Publications
Date: 23-01-2014
Abstract: The position of sulphur within a cured epoxy amine network and its impact upon the thermal, mechanical, chemical and physical properties has been investigated in this study. Sulphur-containing epoxy resins, diglycidyl thioether of bisphenol A (DGTEBA) and diglycidyl ether of dithio diphenyl (DGTED) have been synthesised, cured and characterised and then compared with the benchmark epoxy resin, diglycidyl ether of bisphenol A (DGEBA). DGTEBA has two sulphur atoms located terminally to the epoxide groups, whilst DGTED has a sulphur atom located centrally between two phenyl groups. Evaluation of the properties and cure mechanism using 4,4′-diamino diphenyl sulphone (4,4′-DDS) as the hardener showed that when the sulphur was terminally located, the glass transition temperature, cure conversion, thermal stability, yield strain and stress decrease substantially, whilst the rate of cure and methyl ethyl ketone (MEK) ingress was comparatively higher. Near-infrared spectroscopy revealed that a competing hydrogen abstraction reaction mechanism deactivated the epoxide ring to nucleophilic attack to produce a heterogeneous network and poorer properties. In contrast, the properties and network structure of the DGTED-cured network, which had sulphur placed centrally between the diphenyl groups were similar to DGEBA except that MEK fluid ingress was reduced. The DGTEBA epoxy was also cured with other amines of varying reactivity to reveal that the hydrogen abstraction mechanism was dependent upon the reactivity of the hardener. Less reactive hardeners were dominated by the hydrogen abstraction mechanism, whilst the more reactive amines displayed a step-growth mechanism more typically associated with epoxy amine cure.
Location: Australia
Location: Australia
No related grants have been discovered for Wendy Tian.