Poly(ethylene terephthalate-co-isophthalate) copolyesters obtained from ethylene terephthalate and isophthalate oligomers
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hdl:2117/6282
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Data publicació2010-02-05
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Abstract
A series of poly(ethylene terephthalate-co-isophthalate) copolyesters
containing up to 50%-mole of isophthalic units were prepared by polycondensation
from ethylene terephthalate and ethylene isophthalate fractions of linear oligomers
containing from 5 to 6 repeating units in average. The polyesters were obtained in good
yields and with high molecular weights. The microstructure of the copolyesters was
studied as a function of reaction time by 13C-NMR showing that a random distribution of
the comonomers was achieved since the earlier stages of polycondensation. The
melting temperature and enthalpy of the copolyesters decreased with the content of
isophthalic units so that copolyesters containing more than 25% of these units were
amorphous. Isothermal crystallization studies made on crystalline copolyesters
revealed that the crystallization rate of copolyesters decreased with the content in
isophthalic units.
CitacióUbach, J. [et al.]. Poly(ethylene terephthalate-co-isophthalate) copolyesters obtained from ethylene terephthalate and isophthalate oligomers. "Journal of applied polymer science", 05 Febrer 2010, vol. 115, núm. 3, p. 1823-1830.
ISSN0021-8995
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