MICROSTRUCTURE OF POLY (ETHYLENE TEREPHTHALATE) FIBERS BY EXPOSURE TO SUPERCRITICAL CARBON DIOXIDE

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BASERI SOMAYEH; KARIMI MOHAMMAD; MORSHED MOHAMMAD

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Journal: Iranian Journal of Polymer Science and Technology Year:2014 | Volume:26 | Issue:5 (ISSUE NO. 127) Page(s): 365-379

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Title

MICROSTRUCTURE OF POLY (ETHYLENE TEREPHTHALATE) FIBERS BY EXPOSURE TO SUPERCRITICAL CARBON DIOXIDE

Author(s)

BASERI SOMAYEH | KARIMI MOHAMMAD | MORSHED MOHAMMAD | Issue Writer Certificate

Keywords

POLY (ETHYLENE TEREPHTHALATE)Q2

FIBERSQ2

TRANSIENT STRUCTUREQ2

SUPERCRITICAL FLUIDQ3

COLD-DRAWINGQ3

CRYSTALLIZATIONQ3

Abstract

POYPET fiber samples were uniaxially drawn below the glass transition temperature (Tg) at various draw ratios to obtain filaments with different TRANSIENT STRUCTUREs. The TRANSIENT STRUCTURE was composed of polymeric chains with para-crystalline or mesomorphic order and played a key role on the ultimate properties offibers. Therefore, the study of the post-treatment mesomorphic structural changes would be of great interest. Initially the samples were exposed to supercritical CO2 under tension and tension-free conditions to induce morphological changes in their structures. The evolution of micro-structural changes under exposure to supercritical CO2 was investigated by conventional methods such as DSC, FTIR, birefringence and mechanical properties. A good correlation was obtained between the results of various analytical studies. Analyzing the results of DSC and FTIR showed that the amount of extended chains and TRANSIENT STRUCTURE developing during COLD-DRAWING increased with the draw ratio. The results showed that exposure to supercritical CO2 led to the absorption of CO2 molecules into the free volumes of amorphous phase of the samples and increasing the crystalline phase and lowering the TRANSIENT STRUCTUREs in the treated FIBERS. Sample treatment conditions play important role on the structural changes and in transforming the oriented chains of the mesophase into the crystalline or non-crystalline domains, PET FIBERS exposed to supercritical CO2 under tension present higher degree of crystallinity and molecular compactness in the amorphous domains but lower values of TRANSIENT STRUCTUREs than the non-tension exposed samples. Exposure to supercritical CO2 gave rise to such structural changes as CRYSTALLIZATION, orientation, and mesomorphic transitions. Hence, this method is a promising approach for tailoring structural changes in PET samples.

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APA: Copy

BASERI, SOMAYEH, KARIMI, MOHAMMAD, & MORSHED, MOHAMMAD. (2014). MICROSTRUCTURE OF POLY (ETHYLENE TEREPHTHALATE) FIBERS BY EXPOSURE TO SUPERCRITICAL CARBON DIOXIDE. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 26(5 (ISSUE NO. 127)), 365-379. SID. https://sid.ir/paper/392861/en

Vancouver: Copy

BASERI SOMAYEH, KARIMI MOHAMMAD, MORSHED MOHAMMAD. MICROSTRUCTURE OF POLY (ETHYLENE TEREPHTHALATE) FIBERS BY EXPOSURE TO SUPERCRITICAL CARBON DIOXIDE. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2014;26(5 (ISSUE NO. 127)):365-379. Available from: https://sid.ir/paper/392861/en

IEEE: Copy

SOMAYEH BASERI, MOHAMMAD KARIMI, and MOHAMMAD MORSHED, “MICROSTRUCTURE OF POLY (ETHYLENE TEREPHTHALATE) FIBERS BY EXPOSURE TO SUPERCRITICAL CARBON DIOXIDE,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 26, no. 5 (ISSUE NO. 127), pp. 365–379, 2014, [Online]. Available: https://sid.ir/paper/392861/en

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