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Title: Synthesis and Properties of Novel Phosphorus-Containing Bismaleimide/Epoxy Resins
Authors: 疏偉傑
Shu, Wei-Jye
Yang, Bo-Yi
Chin, Wei-Kuo
Perng, Li-Hsiang
Keywords: bismaleimide
flame retardance
curing of epoxy
Date: 2001-04
Issue Date: 2014-12-29 15:01:37 (UTC+8)
Abstract: A novel soluble phosphorus-containing bismaleimide (BMI) monomer,bis(3-maleimidophenyl)phenylphosphine oxide (BMIPO), was synthesized by the imidization of bis(3-aminophenyl) phenylphosphine oxide, in which its structural characterization was identified with 1H-NMR, 13C-NMR, and Fourier transform infrared spectra. The BMIPO resin, with five-membered imide rings and high phenyl density,was an excellent flame retardant with a high glass-transition temperature (Tg), onset decomposition temperature, and limited oxygen index. In phosphorus-containing BMI/epoxy/4,4-methylene dianiline (DDM)-cured resins,homogeneous products were obtained from all proportions without phase separation. Because of the higher reactivity
of BMIPO/DDM relative to that of 4,4-bismaleimidodiphenylmethane (BMIM)/DDM,the increase in the BMIPO/BMIMratio in this blending resin increased the recrosslinking hazards of the postcuring stage and so lowered the Tg value and thermal stability.
The thermal stability of the BMI/epoxy-cured system was lower than that of the epoxy-cured system because of the introduction of a phosphide group into BMIPO,whereas for the Tg value and flame retardancy, the former was significantly higher than the latter: the higher the BMIPO content in the blend, the higher the flame retardancy.
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