ASIA unversity:Item 310904400/8631
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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/8631


    Title: Synthesis and characterization of amorphous poly(ethylene terephthalate) copolymers containing
    Authors: Tsai, Yuhsin;Fan, Cheng-Hsing;Hung, Chi-Yuan;Tsai, Fuu-Jen
    Contributors: Department of Biotechnology
    Keywords: Copolymers;Differential scanning calorimetry;Ethylene;Ethylene glycol;Glass transition;Glycols;Gravimetric analysis;Laser interferometry;Magnetic resonance;Microstructure;Nuclear magnetic resonance;Nuclear magnetic resonance spectroscopy;Plastic products;Polyethylene terephthalates;Polymers;Thermogravimetric analysis;Amorphous;Amorphous polies;Co polyesters;Copolymer compositions;Differential scanning calorimeters;Dimethyl terephthalates;Elongation at breaks;Intrinsic viscosities;NMR;Optical characteristics;Optical transmissions;Phenyl sulfones;Poly(ethylene terephthalate) copolymer;Random microstructures;Ray analyses;Synthesis and characterizations;Tensile modulus;Thermal behaviors;Transition temperatures
    Date: 2009-01
    Issue Date: 2010-04-07 13:17:57 (UTC+0)
    Publisher: Asia University
    Abstract: Poly(ethylene terephthalate) copolymers (abbreviated as PETS) that contain bis[4-(2-hydroxyethoxy)phenyl]sulfone (BHEPS) were prepared from dimethyl terephthalate (DMT), ethylene glycol (EG) (5-95%) and BHEPS (5-95%). The compositions and microstructures of the copolyesters were determined by <sup>1</sup>H and <sup>13</sup>C nuclear magnetic resonance (NMR) spectroscopy, respectively. The thermal behaviors were studied over the entire range of copolymer compositions, using X-ray analysis, differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). The molecular weights, optical characteristics and tensile properties of these polymers were also determined. Experimental results indicated that the copolymers had a random microstructure. The intrinsic viscosities of the copolymers ranged from 0.65 to 0.69 dL/g. The copolyesters with BHEPS of <10 mol% were crystallizable, whereas the copolyesters with BHEPS of ≥10 mol% were amorphous. Incorporating BHEPS affected the glass-transition temperature (T<inf>g</inf>) values of those polymers, from about 81 °C for PETS<inf>5</inf> to 126 °C for PETS<inf>95</inf>. The optical transmissions exceeded 86% for λ = 400 nm for all of the amorphous polyesters. The tensile modulus and strength of the copolyesters increased with BHEPS. However, they also became brittle and their elongation at break decreased. © 2008 Elsevier Ltd. All rights reserved.
    Relation: European Polymer Journal 45(1):115-122
    Appears in Collections:[Department of Biotechnology] Journal Article

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