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Crystallinity morphology and dynamic mechanical characteristics of PBT polymer and glass fiber‐reinforced composites
Author(s) -
Park ChanSeok,
Lee KiJun,
Kim Seong Woo,
Lee Young Kwan,
Nam JaeDo
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11011
Subject(s) - crystallinity , materials science , crystallization , composite material , nucleation , crystallite , composite number , phase (matter) , fiber , crystallization of polymers , amorphous solid , glass fiber , dynamic mechanical analysis , polymer , chemical engineering , crystallography , chemistry , organic chemistry , engineering , metallurgy
The crystalline morphologies of PBT (poly butylene terephthalate) and its glass fiber reinforced composite systems were investigated in a thin‐film form by polarized optical microscopy and wide‐angle X‐ray diffraction. Three different types of PBT morphology were identified in the Maltese cross pattern: 45° cross pattern (usual type) by solvent crystallization, 90° cross pattern (unusual type) by melt crystallization at low crystallization temperature, and mixed type by melt crystallization at crystallization temperatures higher than 160°C. The glass fibers increased the number density of spherulites and decreased the size of crystallites acting as crystallization nucleation sites without exhibiting trans‐crystallinity at the vicinity of the glass fiber surfaces. Finally, the storage modulus was analyzed by using a dual‐phase continuity model describing the modulus by the power‐law sum of the amorphous‐ and crystalline‐phase moduli. The crystalline‐phase modulus was extracted out from the PBT polymer and composite systems containing different amount of crystallinity. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 478–488, 2002