Calorimetric Studies of Poly(Ethylene Terephthalate) (PET) Fibers. Cold Crystallization Kinetics
V. Velev1, H. Hristov2, A. Popov3, Betchev4

1Valentin Velev, Assoc. Prof., Faculty of Natural Sciences, Konstantin Preslavsky University, Shumen, Bulgaria.
2Hristo Y. Hristov, Assoc. Prof.,Faculty of Natural Sciences, Konstantin Preslavsky University, Shumen, Bulgaria.
3Anton N. Popov, Assoc. Prof., Central Scientific Research Laboratory, University, Burgas, Burgas, Bulgaria.
4Christo Betchev, Assoc. Prof., University of Chemical Technology and Metallurgy, Sofia, Bulgaria.

Manuscript received on 23 March 2015 | Revised Manuscript received on 30 March 2015 | Manuscript published on 30 March 2015 | PP: 32-36 | Volume-4 Issue-1, March 2015 | Retrieval Number: A1345034115©BEIESP
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Abstract: Using Tian – Calvet differential calorimetry the cold crystallization kinetics at isothermal conditions of amorphous as-spun poly (ethylene terephthalate) (PET) filaments has been investigated. The Avrami’s equation was applied for analysis of the obtained experimental data. It has been shown that the mechanical impact significantly influences the process of the samples crystallization. Has been studied and the influence of linear density on the objects crystallization kinetics. It was suggested that poly (ethylene terephthalate) fibers crystallizes one-, and two-dimensionally from preexisting nuclei. These results are in accordance with the assumption of the quasi-crystallization centers existing in the amorphous PET, formed during the fibers spinning.
Keywords: Poly (Ethylene Terephthalate), Filaments, Tian – Calvet calorimetry, Crystallization kinetics, Avrami’s equation.

Scope of the Article: Mechanical Design