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Study of microstructure of oriented PET fibres exposed to supercritical carbon dioxide

Content Provider	Springer Nature Link
Author	Baseri, Somayeh Karimi, Mohammad Morshed, Mohammad
Copyright Year	2014
Abstract	Samples of partially oriented yarn (POY) PET fibers were uniaxially drawn at temperatures below, near, and above the glass transition temperature at a constant draw ratio before exposure to supercritical carbon dioxide (scCO$_{2}$) in the presence of tension at a temperature of 80 °C and a pressure of 220 bar. The effects of drawing temperature and scCO$_{2}$ exposure on structural changes and on mesomorphic transitions, in particular, were investigated using differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and birefringence and density measurements. A good correlation was obtained among the results obtained from various techniques. Results indicated that the development of a transient mesophase structure depended strongly on process temperature. By drawing PET fibers in the samples at temperatures below the glass transition (cold-drawing), a mesophase structure developed in which the highly extended chains played a key role in structural changes incurred. Meanwhile, exposure to scCO$_{2}$ led to the plasticization of the samples accompanied by their reduced glass transition and cold crystallization temperatures. This process also gave rise to the appearance of a second melting peak at about 135 °C that is related to the melting of imperfect and thin crystals, thereby inducing structural changes in the treated fibers. In the case of samples subjected to cold drawing and to scCO$_{2}$ exposure, the transformation of the mesophase structure into the crystalline phase was found to be strongly affected by scCO$_{2}$ exposure, while this same effect was negligible in the case of hot drawn samples.
Starting Page	161
Ending Page	168
Page Count	8
File Format	PDF
ISSN	12299197
Journal	Fibers and Polymers
Volume Number	15
Issue Number	1
e-ISSN	18750052
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-01-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poly (ethylene therephthalate) Supercritical CO$_{2}$ Drawing temperature Structural changes Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Polymers and Plastics

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