Malleable and Recyclable Poly(urea-urethane) Thermosets bearing Hindered Urea Bonds

Yanfeng Zhang; Hanze Ying; Kevin R Hart; Yuxiao Wu; Aaron J Hsu; Anthony M Coppola; Tae Ann Kim; Ke Yang; Nancy R Sottos; Scott R White; Jianjun Cheng

doi:10.1002/adma.201601242

Malleable and Recyclable Poly(urea-urethane) Thermosets bearing Hindered Urea Bonds

Adv Mater. 2016 Sep;28(35):7646-51. doi: 10.1002/adma.201601242. Epub 2016 Jul 4.

Authors

Yanfeng Zhang^{1

2}, Hanze Ying², Kevin R Hart³, Yuxiao Wu², Aaron J Hsu², Anthony M Coppola³, Tae Ann Kim⁴, Ke Yang⁴, Nancy R Sottos⁴, Scott R White³, Jianjun Cheng⁵

Affiliations

¹ Department of Applied Chemistry, School of Science and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key Laboratory for Mechanical Behaviour of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.
² Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
³ Aerospace Engineering Department, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
⁴ Department of Materials Science and Engineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
⁵ Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. jianjunc@illinois.edu.

PMID: 27374855
DOI: 10.1002/adma.201601242

Abstract

Poly(urea-urethane) thermosets containing the 1-tert-butylethylurea (TBEU) structure feature a reversible dissociation/association process of their covalent linkages under mild conditions. Unlike conventional thermosets, TBEU-based poly(urea-urethane) thermosets maintain their malleability after curing. Under high temperature (100 °C) and applied pressure (300 kPa), ground TBEU thermoset powder can be remolded to bulk after 20 min.

Keywords: dynamic covalent chemistry; hindered urea bonds; malleable; poly(urea-urethane) thermosets; recyclable.