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Effects of fibers on the glass transition temperature of polyphenylene sulfide composites
Author(s) -
Rebenfeld Ludwig,
Desio Glenn P.,
Wu James C.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070420324
Subject(s) - materials science , aramid , composite material , glass transition , differential scanning calorimetry , fiber , sulfide , glass fiber , synthetic fiber , polymer , physics , metallurgy , thermodynamics
The glass transition temperature ( T g ) of polyphenylene sulfide (PPS), and of several commercial and model PPS prepregs with aramid, carbon, and glass fibers was studied by means of differential scanning calorimetry. The T g of unreinforced PPS was found to range between 83–90°C, depending on source and molecular weight. The T g of the commercial prepregs was depressed by about 3–5°C from that of the corresponding unfilled PPS, an effect that was ascribed to the plasticization of the PPS by one or more components of the fiber finish (size) that was assumed to have diffused into the PPS polymer. In the case of model prepregs prepared with finish‐free reinforcing fibers, an expected increase in T g was observed. In model prepregs prepared with finished (sized) aramid fibers, the T g was depressed as in the case of the commercial prepregs. With sized AS‐4 carbon fibers, the T g was increased, but significantly less so than with unsized AS‐4 fibers. With sized glass fibers, the same slight increase in T g was observed as with unsized glass fibers. The increase or decrease of T g in all cases was a function of the fiber content in the model PPS prepregs.