TEMPERATURE DEPENDENCY OF POLY (VINYLIDENE FLUORIDE) CHAIN DIMENSION IN SOLUTION AND MELT STATE

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SALIMI ALI; YOUSEFI ALI AKBAR; RAZAVI NOURI MOHAMMAD

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Journal Paper

Paper Information

Journal: Iranian Journal of Polymer Science and Technology Year:2012 | Volume:25 | Issue:1 (ISSUE NO. 117) Page(s): 32-41

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Title

TEMPERATURE DEPENDENCY OF POLY (VINYLIDENE FLUORIDE) CHAIN DIMENSION IN SOLUTION AND MELT STATE

Author(s)

SALIMI ALI | YOUSEFI ALI AKBAR | RAZAVI NOURI MOHAMMAD | Issue Writer Certificate

Keywords

POLY (VINYLIDENE FLUORIDE)

CRYSTAL

CHAIN HYDRODYNAMIC VOLUME

RHEOMETRY

VISCOMETRY

Abstract

The final CRYSTALline phase in poly (vinylidene flouride), PVDF, films mainly reflects the polymer structural arrangement or chain conformation during film formation. In this study, the intrinsic viscosity of PVDF solution or even the zero-shear-rate viscosity in polymer melt were used as indications of polymer hydrodynamic chain volume to predict the possible formation of all trans plannar zigzag conformation (b phase CRYSTAL). The studies on intrinsic viscosity of each diluted solution were carried out in Ubbelohde viscometer at temperature range of 25-100oC using two individual solvents with different polarities namely, dimethyl acetamide and cyclohexanone. In contrast to solvent polarity, the solution temperature showed negative effect in the degree of hydrodynamic chain volume. This behaviour maybe attributed to higher thermodynamic stability of gauche state rather than trans state in PVDF chains at higher CRYSTALlization temperatures. In this regard, through a temperature rise from 25oC to 100oC, the PVDF hydrodynamic chain volume experienced a reduction of about 38% and 25% in dimethyl acetamide and cyclohexanone, respectively. The further reduction of PVDF hydrodynamic chain volume in dimethyl acetamide solution may be referred to higher polymer chain mobility and reduced solvent polarity at higher temperatures. Using zero-shear rate viscosity, the increase in melt temperature showed reduction of about 87% in hydrodynamic chain volume. The temperature dependence of PVDF chain dimension in solution and melt state show a similar trend. These findings are in agreement with the previous results about the unhelpful effect of CRYSTALization temperature in favor of b phase CRYSTAL formation in PVDF.

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APA: Copy

SALIMI, ALI, YOUSEFI, ALI AKBAR, & RAZAVI NOURI, MOHAMMAD. (2012). TEMPERATURE DEPENDENCY OF POLY (VINYLIDENE FLUORIDE) CHAIN DIMENSION IN SOLUTION AND MELT STATE. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 25(1 (ISSUE NO. 117)), 32-41. SID. https://sid.ir/paper/644624/en

Vancouver: Copy

SALIMI ALI, YOUSEFI ALI AKBAR, RAZAVI NOURI MOHAMMAD. TEMPERATURE DEPENDENCY OF POLY (VINYLIDENE FLUORIDE) CHAIN DIMENSION IN SOLUTION AND MELT STATE. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2012;25(1 (ISSUE NO. 117)):32-41. Available from: https://sid.ir/paper/644624/en

IEEE: Copy

ALI SALIMI, ALI AKBAR YOUSEFI, and MOHAMMAD RAZAVI NOURI, “TEMPERATURE DEPENDENCY OF POLY (VINYLIDENE FLUORIDE) CHAIN DIMENSION IN SOLUTION AND MELT STATE,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 25, no. 1 (ISSUE NO. 117), pp. 32–41, 2012, [Online]. Available: https://sid.ir/paper/644624/en

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