Thermo-reversible healing in a crosslinked polymer network containing covalent and thermo-reversible bonds

Khor, Sarah P., Varley, Russell J., Shen, Shirley Z. and Yuan, Qiang 2013, Thermo-reversible healing in a crosslinked polymer network containing covalent and thermo-reversible bonds, Journal of applied polymer science, vol. 128, no. 6, pp. 3743-3750, doi: 10.1002/app.38578.

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Title Thermo-reversible healing in a crosslinked polymer network containing covalent and thermo-reversible bonds
Author(s) Khor, Sarah P.
Varley, Russell J.ORCID iD for Varley, Russell J.
Shen, Shirley Z.
Yuan, Qiang
Journal name Journal of applied polymer science
Volume number 128
Issue number 6
Start page 3743
End page 3750
Total pages 8
Publisher Wiley
Place of publication London, Eng.
Publication date 2013-06-15
ISSN 0021-8995
Summary The self-healing behavior of a modified ureido-amide based thermoplastic hybrid elastomer was investigated by increasing the concentration of non-reversible (covalent) bonds compared to reversible (hydrogen) bonds. A crosslinked polymer network was synthesized using varying amounts of diglycidylether of bisphenol A and reacting with the ureido-amide thermoplastic. Increasing epoxy content produced a more rigid and thermally stable hybrid network, which in turn decreased overall thermo-reversible or healing behavior. Fracture toughness recoveries varied from 25% for the system containing the greatest number of covalent bonds to well over 200% for systems containing higher thermoplastic content. Substantial levels of healing, about 62% recovery, were still achieved despite the crosslinked network having a Tg above room temperature, 31°C as measured by differential scanning calorimetry (DSC). Dynamic mechanical thermal analysis was used to monitor thermo-reversible behavior of the elastic moduli and thus probe molecular mobility within the glassy state. The extent and rate of recovery of the elastic modulus was dominated by the extent of thermal activation above the glass transition temperature. Fourier transform infrared spectroscopic and DSC studies confirmed that reacting the thermoplastic with an epoxy resin produced a covalently bonded crosslinked network and the epoxide groups were completely consumed.
Language eng
DOI 10.1002/app.38578
Field of Research 030199 Analytical Chemistry not elsewhere classified
Socio Economic Objective 0 Not Applicable
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, Wiley Periodicals, Inc.
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