| Summary: | 博士 === 國立臺北科技大學 === 有機高分子研究所 === 105 === There are two series of copolyesters were synthesized individually in this study. One series of aliphatic/aromatic copolyester was that contained different amounts of aliphatic segments, constructed from adipic acid (AA, 0~0.117 mole ratios), and fixed amount of poly(ethylene oxide) (PEO) segments. The other series was aliphatic/aromatic copolyester that contained different amounts of PEO segments, constructed from polyethylene glycol (PEG, 0.003~0.019 mole ratios, 4~20wt%). The structures of each series of copolymers were confirmed by 1H nuclear magnetic resonance (1H-NMR). The molecular weights were determined directly by gel permeation chromatography (GPC) and indirectly by the intrinsic viscosity (IV). The results of thermal tests revealed that both melting temperature (Tm) and crystallization temperature (Tc) decreased as the aliphatic segment and PEO segment contents increased. The glass transition temperatures (Tg) that were determined by DMA followed the same trend as did Tm. Moreover, the thermal stability, determined from TGA declined as AA and PEG were incorporated into the PET main-chains. All of the copolymers that were synthesized herein were spun into fibers and then physically characterized. The tenacity of the fibers decreased as the aliphatic segment and PEO segment contents increased. The crystalline structures, revealed by wide-angle X-ray scattering (WAXS), indicated that the crystallinity decreased with increasing AA and PEG contents because of the reduction of regularity of the PET chains. Most importantly, the tests that were carried out on the knitted fabric demonstrated that the Moisture absorptivity and cool feeling (Qmax) of the copolymer fabrics were better than those of fabrics that comprised neat PET chains owing to the incorporation of PEO segments. Finally, the copolymer fabric exhibited better hydrolysis and enzymatic degradation than did neat PET fabric.
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