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

Polymers

Senlong Gu¹ 

[1] Department of Polymer Engineering, University of Akron, 250 Forge Street, Akron, OH 44325-0301, USA; E-Mail

关键词: shape memory;    polyurethane;    polybenzoxazine;   

DOI  :  10.3390/polym6041008

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.