Title: CO[POLY(ETHYLENE TEREPHTHALATE-P-OXYBENZOATE)] THERMOTROPIC COPOLYESTER .2. X-RAY-DIFFRACTION ANALYSIS
Authors: SHINN, TH
LIN, CC
應用化學系
Department of Applied Chemistry
Issue Date: 10-Feb-1993
Abstract: A series of co [poly (ethylene terephthalate-p-oxybenzoate)] thermotropic copolyester with different compositions were prepared by the copolymerization of either poly(ethylene terephthalate) (PET) polymer or its oligomer with p-acetoxy-benzoic acid. The polymeric products were subjected to solid-state polymerization for various time intervals. Effects of composition ratio and solid-state polymerization time on X-ray diffraction behavior were investigated. It is found that the effect of transesterification induced by solid-state polymerization causes an increase in crystallinity with the copolyesters having high mol % of p-oxybenzoic acid (POB) moiety and causes a decrease in crystallinity with the copolyesters having high mol % of PET moiety. In general, the crystallinity of copolyesters is first increased and then decreased as solid-state polymerization time proceeds. However, the crystallinity of copolyester having POB/PET = 80/20 composition is increased generally at 4-h solid-state polymerization. It is also found that the crystallinity of copolyesters is decreased by quenching. The copolyester based upon either PET oligomer with 4-h solid-state polymerization or PET polymer with 8-h solid-state polymerization shows the most similar X-ray diffraction pattern with that of Eastman 10109.
URI: http://dx.doi.org/10.1002/app.1993.070470618
http://hdl.handle.net/11536/3121
ISSN: 0021-8995
DOI: 10.1002/app.1993.070470618
Journal: JOURNAL OF APPLIED POLYMER SCIENCE
Volume: 47
Issue: 6
Begin Page: 1105
End Page: 1113
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