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Nonisothermal crystallization kinetics of peo in ethylene terephthalate‐ethylene oxide segmented copolymers
Author(s) -
Kong Xiaohua,
Yang Xiaoniu,
Zhou Enle,
Ma Dezhu
Publication year - 2001
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10776
Subject(s) - crystallization , materials science , avrami equation , copolymer , differential scanning calorimetry , ethylene oxide , kinetics , ethylene , polymer chemistry , thermodynamics , oxide , chemical engineering , crystallization of polymers , composite material , polymer , chemistry , catalysis , organic chemistry , physics , quantum mechanics , metallurgy , engineering
The nonisothermal crystallization behavior of Ethylene Terephthalate‐Ethylene Oxide (ET‐EO) segmented copolymers has been studied with the use of differential scanning calorimetry (DSC). The kinetics of PEO in ET‐EO segmented copolymer under nonisothermal crystallization conditions has been analyzed with the Ozawa equation. The results show that there is no agreement with Ozawa's theoretical predictions in the whole crystallization process owing to the constraint of ET segments imposed on the EO segments. A distinct two‐crystallization process has been investigated by using the Avrami equation modified by Jeziorny to deal with the nonisothermal crystallization data. The value of the Avrami exponent n is independent of the length of soft segments. However, the crystallization rate is sensitive to the length of soft segments. The longer the soft segments, the faster the crystallization will be.