Summary
The presence of fiber tissues disturbs the chemical reaction between isocyanate and alcohol or amine. The extraction by the solvent tetrahydrofurane shows that the matrix polyurethane with carbon or aramid tissues contain an abnormally high proportion of soluble macromolecules. The FT-IR analysis shows incomplete reaction with these two fibers, or by-side products present on the glass fiber surface.
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Chakar, A., Lam, T.M. & Pascault, J.P. Analysis of the structure of polyurethane matrix in fiber-composites. Polymer Bulletin 12, 15–22 (1984). https://doi.org/10.1007/BF00258266
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DOI: https://doi.org/10.1007/BF00258266