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Fiber structure development in high‐speed melt spinning of copolyesters: Poly(ethylene terephthalate‐co‐ 1,4‐cyclohexylene dimethylene terephthalate)
Author(s) -
Kikutani Takeshi,
Morohoshi Katsumi,
Yoo Hee Yeoul,
Umemoto Susumu,
Okui Norimasa
Publication year - 1995
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.760351108
Subject(s) - materials science , crystallization , copolyester , copolymer , ethylene , melt spinning , poly ethylene , amorphous solid , spinning , polymer chemistry , annealing (glass) , composite material , chemical engineering , crystallography , polymer , polyester , organic chemistry , catalysis , chemistry , engineering
High‐speed melt spinning of poly(ethylene terephthalate) (PET), poly(1,4‐cyclohexylene dimethylene terephthalate) (PCT) and ET/CT copolysters were performed and the structure and properties of as‐spun fibers were investigated. Molecular orientation increased with an increase in the take‐up velocity, and orientation‐induced crystallization of PET and PCT started at ∼4.5 and 3.5 km/min. With the addition of CT component to PET, and ET to PCT, the onset of crystallization shifted to higher velocities. In as‐spun fibers of the copolymer of ET/CT = 66/34 mol%, which is known as an amorphous copolyester, the crystallization was not observed even at the attained highest take‐up velocity, 6 km/min. On the other hand, crystallization of these fibers occured on annealing suggesting that although the incorporation of copolymer component suppresses the crystallization, the molecular orientation enhances the crystallization of copolymer systems as in the cases of homopolymers.