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KMID : 1059519870310060582
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Journal of the Korean Chemical Society
1987 Volume.31 No. 6 p.582 ~ p.589
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Copolyester Studies (6) Thermal Properties of Poly(Ethylene Terephthalate) Modified by 5-Sulfoisophthalic Acid Sodium Salt
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Ahn Tae-Oan
Jeong Han-Mo
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Abstract
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The thermal properties of poly (ethylene terephthalate) (PET) modified by 5-sulfoisophthalic acid sodium salt(SIAS) were studied. The glass transition temperature was increased, and the melting temperature and the crystallization rate were decreased as the content of SIAS unit was increased. The decrease of crystallization rate is thought to be due to the polar, bulky sulfonic acid sodium salt group which greatly retards the crystallization on to the growing crystal surface of the diffused polymer chain. The crystallization mechanism of copolyester is dependent on the content of SIAS unit and the three dimensional growth of crystal is hindered by the added SIAS unit.
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