Journal
MACROMOLECULES
Volume 50, Issue 15, Pages 5739-5747Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.7b01085
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Funding
- Ministry of Science and Technology, Taiwan [MOST103-2221-E-110-079-MY3, MOST105-2221-E-110-092-MY3]
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In this study a new type of bifunctional phenolic compound based on a double-decker silsesquioxane (DDSQ-BP) was synthesized from phenyltrimethylsilane and then reacted (Mannich condensation) with allylamine and CH2O to form a bis-allyl benzoxazine DDSQ derivative (DDSQ-BZ). The structures of these DDSQ derivatives were confirmed using Fourier transform infrared and nuclear magnetic resonance spectroscopy and MALDI-TQF mass spectrometry. Highly thermally stable, transparent, and flexible polybenzoxaiine prepolymers were obtained after hydrosilylation of DDSQ-BZ with polydimethylsiloxane (PDMS) as the flexible segment; these materials were characterized using differential scanning calorimetry thermogravimetric analysis, Microtensile testing, and UV-vis spectroscopy. The char yield of DDSQ-BZ-PDMS was 73 wt%, significantly higher than that of a typical polybenzoxazine; in addition, DDSQ-BZ-PDMS displayed high flexibility and transparency after thermal curing.
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