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Effect of heating on the structure of carbon fiber polyphenylenesulfide‐matrix composite, as studied by electrical resistance measurement
Author(s) -
Mei Zhen,
Chung D. D. L.
Publication year - 1998
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.10144
Subject(s) - materials science , composite material , composite number , isothermal process , electrical resistance and conductance , crystallinity , annealing (glass) , crystallization , thermal resistance , temperature cycling , fiber , matrix (chemical analysis) , thermal , thermodynamics , physics
Heating and cooling were found to affect the structure of carbon fiber polyphenylenesulfide‐matrix composites, as shown by their effects on the DC electrical resistance of the composite in the fiber direction. Matrix flow during first heating above T g and thermal stress buildup during cooling in any thermal cycle caused the resistance to increase, whereas isothermal crystallization at 180°C caused the resistance to decrease. Thermal stress buildup was reversible upon thermal cycling. Prior annealing at 180°C diminished the matrix flow because of improved fiber‐matrix bond, and it increased the matrix crystallinity. Annealing at 180°C for 15 h or more was sufficient to eliminate the matrix flow.