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Morphology and properties of poly(benzoxazine‐ co ‐urethane)s based on bisphenol‐S/aniline benzoxazine
Author(s) -
Li Zhihong,
Liu Yanfang,
Zhang Jie,
Zhao Shasha,
Luo Shanshan,
Yue Zaiqin,
Run Mingtao
Publication year - 2013
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23520
Subject(s) - materials science , prepolymer , thermal stability , dynamic mechanical analysis , polyurethane , glass transition , polymer chemistry , scanning electron microscope , copolymer , fourier transform infrared spectroscopy , chemical engineering , composite material , polymer , engineering
Poly(benzoxazine‐ co ‐urethane) was prepared by melt‐blending bisphenol‐S/aniline‐type benzoxazine (BS‐a) with isocyanate‐terminated polyurethane (PU) prepolymer based on 2,4‐toluene diisocyanate and poly(ethylene glycol), followed by thermally activated polymerization of the blend. The copolymerization reaction between BS‐a and PU prepolymer was monitored using Fourier transform infrared spectroscopy. The morphology, dynamic mechanical properties, and thermal stability of the poly(benzoxazine‐ co ‐urethane) were studied using scanning electron microscopy, dynamic mechanical analysis, and thermogravimetry. Homogeneous morphology is shown in scanning electron micrographs of the fracture surfaces of poly(benzoxazine‐ co ‐urethane)s with different urethane weight fractions, and the roughness of the surface increases with urethane content increasing. Correspondingly, a single glass transition temperature ( T g ) is shown on the dynamic mechanical analysis curves of the poly(benzoxazine‐ co ‐urethane)s, and the T g is higher than that of the polybenzoxazine. With increase in the urethane content, the T g and water absorption of poly(benzoxazine‐ co ‐urethane) increase, whereas the storage modulus and thermal stability decrease. POLYM. ENG. SCI., 53:2633–2639, 2013. © 2013 Society of Plastics Engineers