Mechanical properties of woven glass fabric reinforced in situ polymerized poly(butylene terephthalate) composites

Z. A. Mohd Ishak, Y. W. Leong, M. Steeg, J. Karger-Kocsis

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Cyclic butylene terephthalate (CBT) has been polymerized in situ at T = 190 °C in the presence and absence of woven glass fabric (WGF). The thermal properties of the in situ polymerized poly(butylene terephthalate) (ISP-PBT) were compared with those of a commercial injection molded PBT (IM-PBT). It was found that the crystallinity of IM-PBT is markedly lower than that of ISP-PBT rendering the latter more brittle. WGF-reinforced (ca. 50 vol.%) ISP-PBT composites were fabricated by compression molding at T = 190 °C using displacement and pressure-controls. Effects of the molding condition were investigated in tensile, three-point bending, short beam shear and dynamic mechanical thermal analysis tests. Both tensile and flexural properties (stiffness and strength), as well as inter-laminar shear strength, were enhanced when the molding occurred under pressure-controlled instead of displacement-controlled conditions. Scanning electron microscopic (SEM) inspection revealed excellent wet-out of the fibers and good interfacial bonding between the fibers and ISP-PBT.

Original languageEnglish
Pages (from-to)390-398
Number of pages9
JournalComposites Science and Technology
Volume67
Issue number3-4
DOIs
Publication statusPublished - Mar 1 2007

Keywords

  • Continuous fiber polymer composites
  • Cyclic butylene terephthalate
  • Cyclic oligomers
  • Poly(butylene terephthalate)
  • Thermoplastic composites

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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