Shape memory polybenzoxazines based on a siloxane‐containing diphenol. Issue 13 (12th March 2016)

• Record Type: Journal Article
• Authors: Liu, Yanfang; Li, Yuehong; Zhang, Chunhui; Wang, Rongrong; Run, Mingtao; Song, Hongzan
• Is Part Of: Journal of polymer science. Volume 54:Issue 13(2016)
• Page Start: 1255
• Page End: 1266
• Publication Date: 2016-03-12
• Subjects: benzoxazine -- crosslinking -- glass transition -- ring‐opening polymerization -- shape memory effect -- shape memory polymer -- siloxane -- stimuli‐sensitive polymers -- thermosets; 547
• DOI: 10.1002/polb.24033
• Languages: English
• ISSNs: 0887-6266

Abstract

ABSTRACT: A siloxane‐containing diphenol is synthesized from 1, 1, 3, 3‐tetramethyldisiloxane and o ‐allylphenol, followed by the Mannich condensation with aniline, methylamine, and formaldehyde yielding two siloxane‐containing benzoxazines. The onset polymerization temperature of aniline‐based benzoxazine is higher than that of the methylamine counterpart. The dynamic mechanical properties of the polybenzoxazines depend on the structure of the starting primary amines. Both polybenzoxazines exhibit one‐way dual‐shape memory behavior in response to changes in temperature, and they show excellent shape fixity ratios in bending, tension, and tensile stress–strain tests, high shape recovery ratios in bending and tension tests, but relatively low shape recovery ratios in tensile stress–strain test. The network chain segments including the alkylsiloxane units serve as a thermal control switch based on the glass transition temperatures (39 and 53 °C) for the polybenzoxazines. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2016, 54, 1255–1266 Abstract : Two benzoxazines are synthesized from a siloxane‐containing diphenol, and the resultant polybenzoxazines exhibit one‐way dual‐shape memory behavior in response to changes in temperature. In the thermally induced shape memory process, the network chain segments including the alkylsiloxane unit serve as a thermal control switch based on the glass transition temperatures for the polybenzoxazines. The shape memory effects of the polybenzoxazines are characterized by both bending and tensile stress–strain tests.