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Title: Properties of poly(butylene terephthatlate) polymerized from cyclic oligomers and its composites
Authors: Parton, Hilde ×
Baets, Joris
Lipnik, P.
Goderis, Bart
Devaux, Jacques
Verpoest, Ignace #
Issue Date: Jan-2005
Publisher: Elsevier sci ltd
Series Title: Polymer vol:46 issue:23 pages:9871-9880
Abstract: The high viscosity of thermoplastic matrices hampers fiber impregnation. This problem can be overcome by using low viscous polymeric precursors such as cyclic butylene terephthalate (CBT (R) resins), which polymerize to form a thermoplastic matrix. This allows thermoset production techniques, like resin transfer molding (RTM), to be used for the production of textile reinforced thermoplastics. Due to the processing route and more specifically the time-temperature profile, inherent to the RTM process, the crystallites of the matrix consist out of well-defined, thick and well-oriented crystal lamellae. Together with a high overall degree of crystallinity and a low density of tie molecules, these large and perfect crystals cause polymer brittleness. Matrix brittleness lowers the transverse strength of unidirectional composites to below the matrix strength, but leaves the mechanical properties in the fiber direction unaffected. Although not a valid option for the RTM production route, crystallization from a truly random melt and at a sufficiently high cooling rate would substantially improve the ductility. (c) 2005 Elsevier Ltd. All rights reserved.
ISSN: 0032-3861
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Molecular Imaging and Photonics
Mechanical Metallurgy Section (-)
Polymer Chemistry and Materials
× corresponding author
# (joint) last author

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