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Effects of crystalline morphologies on the mechanical properties of carbon fiber reinforcing polymerized cyclic butylene terephthalate composites

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Author(s): C. M. Wu | C. Y. Chang | C. Y. Wang | T. Yu | S. P. Rwei

Journal: eXPRESS Polymer Letters
ISSN 1788-618X

Volume: 6;
Issue: 4;
Start page: 318;
Date: 2012;
Original page

Keywords: Mechanical properties | processing technologies | polymer composites | cyclic butylenes terephthalate | spherulite boundary

ABSTRACT
Carbon/polymerized cyclic butylene terephthalate (pCBT) composites were prepared through a modified film stacking technique. Three crystalline morphologies of carbon/pCBT composites were obtained at different crystallization temperatures. Tensile, flexural, short beam shear and impact tests were conducted. The low crystallinity carbon/pCBT samples were crystallized at 185°C with spherulitic structure which leads to form the large area spherulite/transcrystalline boundary regions. Consequently, the crack initiated and propagated along with ‘weak’ spherulite/transcrystalline boundary regions, which were resulted low mechanical properties. Carbon/pCBT sample crystallized at 210°C with high crystallinity and highly disordered spherulitic crystallites without spherulite/transcrystalline boundary lines or boundary crystals exhibits the highest mechanical properties.
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