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Thermal and mechanical properties of injection molded blends of a liquid crystalline polymer and poly(butylene terephthalate)
Author(s) -
Engberg K.,
Ekblad M.,
Werner P.E.,
Gedde U. W.
Publication year - 1994
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760341707
Subject(s) - materials science , differential scanning calorimetry , composite material , crystallization , polymer , composite number , thermal expansion , phase (matter) , thermal , chemical engineering , thermodynamics , chemistry , physics , organic chemistry , engineering
The microstructure and the thermal and mechanical properties of injection molded samples of different blends of Vectra (LCP) and poly(butylene terephthalate) (PBT) have been studied. Differential scanning calorimetry and hot‐stage polarized light microscopy showed that the crystallization of PBT was unaffected by the presence of LCP. X‐ray diffraction showed that the PBT component was always unoriented in the injection molded samples. Blends with less than 28 vol% LCP exhibited the same stiffness and the same coefficient of linear thermal expansion as PBT. Blends containing more than 38 vol% LCP contained an oriented LCP phase and had a stiffness in accordance with the upper‐bound composite equation. The coefficients of linear thermal expansion for these blends were close to that of pure LCP.