標題: | STUDIES ON CO[POLY(ETHYLENE TEREPHTHALATE-P-OXYBENZOATE)] THERMOTROPIC COPOLYESTER - THERMOMECHANICAL AND THERMODYNAMIC PROPERTIES |
作者: | SHINN, TH LIN, CC 材料科學與工程學系 Department of Materials Science and Engineering |
公開日期: | 12-Dec-1995 |
摘要: | A series of co[poly(ethylene terephthalate-p-oxybenzoate)] thermotropic copolyesters were prepared by the copolymerization of poly(ethylene terephthalate) (PET) as moiety (II) and p-acetoxybenzoic acid (POB) as moiety (I). The polymeric products obtained were subjected to solid-state polymerization. Characterization of the copolyesters by thermomechanical analysis shows that properties such as the coefficient of thermal expansion, transition temperature, and maximum softening rate temperature varied directly as a function of composition as well as did solid-state polymerization time. All thermomechanical data were found to increase with the solid-state polymerization time due to the increase in the degree of polymerization and the effect of annealing. The coefficient of thermal expansion behaves in a manner that is interpretable by the crystalline state of the copolyester. The relationship between the free-volume fraction and thermodynamic properties is further correlated for a more comprehensive discussion on its molecular arrangements. (C) 1995 John Wiley & Sons. Inc. |
URI: | http://dx.doi.org/10.1002/app.1995.070581108 http://hdl.handle.net/11536/1599 |
ISSN: | 0021-8995 |
DOI: | 10.1002/app.1995.070581108 |
期刊: | JOURNAL OF APPLIED POLYMER SCIENCE |
Volume: | 58 |
Issue: | 11 |
起始頁: | 1981 |
結束頁: | 1989 |
Appears in Collections: | Articles |
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