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標題: Facile, One-Pot Synthesis of Aromatic Diamine-Based Benzoxazines and Their Advantages Over Diamines as Epoxy Hardeners
作者: Chang, S.L.
Lin, C.H.
關鍵字: crosslinking;ring-opening polymerization;thermosets;high-performance thermosets;main-chain;mechanical characterization;thermal polymerization;click chemistry;cross-linking;polybenzoxazines;monomers;polymers;phthalonitrile
Project: Journal of Polymer Science Part a-Polymer Chemistry
期刊/報告no:: Journal of Polymer Science Part a-Polymer Chemistry, Volume 48, Issue 11, Page(s) 2430-2437.
Three aromatic diamine-based benzoxazines were successfully prepared by a facile, clean, one-pot procedure from 1,4-phenylenediamine (1), 4,4'-diaminodiphenyl ether (2), and 4,4'-diaminodiphenyl methane (3), respectively. Their structures were confirmed by NMR spectra and single crystal diffractogram. The effect of the reactivity of diamines on the purity of the resultant benzoxazines was discussed. The resultant benzoxazines were applied as hardeners for cresol novolac epoxy (CNE). The processing window, the latent curing characteristic, and the miscibility of benzoxazine/CNE systems were discussed. Compared with diamines (1 and 3), (1 and 3)-based benzoxazines show latent curing characteristic as epoxy hardeners, and wide processing windows can be obtained. Compared with diamine (2) which is immiscible with CNE in the molten state, (2)-based benzoxazine shows good miscibility with CNE. Dynamic mechanical analysis shows the T(g)s of the benzoxazine/CNE thermosets are as high as 242-243 degrees C. Thermogravimetric analysis shows the outstanding thermal stability of the resultant thermosets. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2430-2437, 2010
ISSN: 0887-624X
DOI: 10.1002/pola.24013
Appears in Collections:化學工程學系所

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