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- Production and processing of thermoplastic based towpregs for commercial and advanced marketsPublication . Nunes, J.P.; Novo, P.J.; Silva, J.F.; Marques, A.T.In this work continuous fibre reinforced thermoplastic matrix towpregs were produced for commercial markets and advanced markets. The former based on glass fibre reinforced polypropylene matrix (GF/PP) and the latter on carbon fibre Primospire® matrix (CF/P). Primospire® is an amorphous highly aromatic material specifically developed by Solvay Advanced Polymers for application in advanced markets. Both towpregs were processed into composite parts by different technologies. The mechanical properties determined on the final composites were compared with the theoretical predictions and have shown to be acceptable for the targeted markets.
- Optimizing the production and processing of fibre reinforced thermoplastic pre-impregnated materialsPublication . Novo, P.J.; Silva, J. F.; Nunes, J. P.; Marques, A. T.The aim of this work is to optimize the production of new continuous carbon fibres reinforced polypropylene matrix pre-impregnated materials (towpregs) continuously processed by dry deposition of polypropylene (PP) powder. The processing of the produced towpregs by pultrusion using a prototype equipment was also optimized. The method of Taguchi/DOE (Design of Experiments) was used to achieve this goal allowing improved choices of processing windows. Towpregs were characterized by scanning electron microscopy (SEM), visual analysis and their polymer mass contents were also determined. The final pultruded composite profiles were also submitted to tensile, interlaminar, flexural, calcination and optical microscopy tests.