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Title: Shape memory polyurethane with polydopamine-coated nanosheets: Simultaneous enhancement of recovery stress and strain recovery ratio and the underlying mechanisms
Authors: Phua, Si Lei
Yang, Liping
Huang, Shu
Ding, Guoqiang
Zhou, Rui
Lew, Jun Heng
Lau, Soo Khim
Yuan, Xiaowen
Lu, Xuehong
Keywords: polydopamine
shape memory polymer
Issue Date: 2014
Source: Phua, S. L., Yang, L., Huang, S., Ding, G., Zhou, R., Lew, J. H., et al. (2014). Shape memory polyurethane with polydopamine-coated nanosheets: Simultaneous enhancement of recovery stress and strain recovery ratio and the underlying mechanisms. European Polymer Journal, 57, 11-21.
Series/Report no.: European Polymer Journal
Abstract: Two different sizes of polydopamine-coated layered double hydroxides (D-LDHs) are incorporated into polycaprolactone-based polyurethane (PU) to enhance the mechanical and shape memory properties of the PU. The results show that D-LDH interacts strongly with hard segments and hence enhancing phase separation between hard and soft segments. It is found that the tensile moduli of the PU/D-LDH nanocomposites are much higher than that of neat PU at 60 oC. In comparison with neat PU, the nanocomposite with 2 wt% of small D-LDH exhibits a 60% increase in recovery stress while shape fixity and strain recovery ratio are also improved simultaneously. This is because at low filler loading, most small D-LDH nanosheets interact with hard domains and they are not large enough to connect neighbor hard domains. They can hence reinforce the hard domains without sacrificing the elasticity of the system. Two-dimensional X-ray diffraction studies indicate that most small D-LDH nanosheets are able to rotate back from aligned state to original random state in shape recovery process, justifying the improved strain recovery ratio.
ISSN: 0014-3057
DOI: 10.1016/j.eurpolymj.2014.04.019
Schools: School of Materials Science & Engineering 
Organisations: A*STAR SIMTech 
Rights: © 2014 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by European Polymer Journal, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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