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Development and characterization of high‐performance polybenzoxazine composites
Author(s) -
Shen Shyan Bob,
Ishida Hatsuo
Publication year - 1996
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10663
Subject(s) - materials science , composite material , dynamic mechanical analysis , glass transition , thermogravimetric analysis , flexural strength , differential scanning calorimetry , flexural modulus , polymer , chemistry , physics , organic chemistry , thermodynamics
To develop high‐performance composites with high temperature resistance, two newly synthesized polybenzoxazines were successfully cured with carbon fiber to obtain composites with 60 vol% fiber. Results from differential scanning calorimetry studies were used to modify the benzoxazine monomers to improve processability in terms of melting point and solubility. The density and void content of these composites were measured. Dynamic mechanical tests were performed to determine the glass transition temperature ( T g ) and the activation enthalpy of the glass transition process for these two composites. The effect of cure temperature on the T g of the composites was investigated. Thermal characteristics were studied by means of dynamic mechanical analysis in terms of isothermal aging, decomposition temperature from thermogravimetric analysis, and storage moduli change at high temperatures. Mechanical evaluations of these composites were conducted by flexural and interlaminar shear tests. The mechanical and thermal properties of these two composites exceed bismaleimide composites and compete with polyimide composites, while exhibiting easier processability than polyimides.