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Polymers 2014, 6(4), 1008-1025;

Effects of Polybenzoxazine on Shape Memory Properties of Polyurethanes with Amorphous and Crystalline Soft Segments

Department of Polymer Engineering, University of Akron, 250 Forge Street, Akron, OH 44325-0301, USA
Author to whom correspondence should be addressed.
Received: 27 February 2014 / Revised: 13 March 2014 / Accepted: 24 March 2014 / Published: 1 April 2014
(This article belongs to the Special Issue Shape-Memory Polymers)
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This paper evaluates the role of minor component polybenzoxazine (PB) on shape-memory properties of polyurethanes (PU) with glassy and crystalline soft segments. The polymer compounds were prepared in two steps. In the first step, benzoxazine, polyurethane pre-polymer, and chain extender butanediol (BD) were mixed into a solution followed by chain-extension of the pre-polymer with BD. In the second step, benzoxazine was polymerized at 180 °C for 3 h to obtain shape memory polymer compounds. The atomic force microscopy images revealed that the PB-phase formed uniform dispersions in PU. The presence of PB-phase induced shape-memory behavior in non-shape memory PU with amorphous soft segment and significantly improved the values of shape fixity, recovery ratio, and recovery stress in shape memory polyurethane with crystalline soft segment. View Full-Text
Keywords: shape memory; polyurethane; polybenzoxazine shape memory; polyurethane; polybenzoxazine

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Gu, S.; Jana, S. Effects of Polybenzoxazine on Shape Memory Properties of Polyurethanes with Amorphous and Crystalline Soft Segments. Polymers 2014, 6, 1008-1025.

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