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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1374

Title: Effect of molecular orientation on the crystallization and melting behavior in poly(ethylene terephthalate)
Authors: Gowd, E Bhoje
Ramesh, C
Byrne, Mark S
Murthy, N Sanjeeva
Radhakrishnan, J
Keywords: Amorphous orientation
Crystallite orientation
Crystallization
Issue Date: 2004
Citation: Polymer, 45(19), 6707-6712
Abstract: Amorphous poly(ethylene terephthalate) fibers in which the skin was removed were studied to expressly study the effect of amorphous molecular orientation on crystallization behavior. Thermal analysis was carried out on fibers with a wide range of molecular orientation using differential scanning calorimetry (DSC) under constrained and unconstrained conditions. The thermal behavior was correlated with structural characteristics such as amorphous orientation determined using wide-angle X-ray diffraction. We show for the first time a quantitative inverse linear relationship between the degree of amorphous orientation and the cold crystallization temperatures and heat of crystallization. Crystallization begins at a critical amorphous orientation of 0.18, and extrapolation shows that even at modest amorphous orientation of 0.27, the cold crystallization can start spontaneously at Tg and with no change in free energy.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1374
Appears in Collections:Textile Technology

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