Increasing solvent polarity and addition of salts promote β-phase poly(vinylidene fluoride) formation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)2902-2910
Journal / PublicationJournal of Applied Polymer Science
Volume128
Issue number5
Online published1 Sept 2012
Publication statusPublished - 5 Jun 2013
Externally publishedYes

Abstract

This article investigates the effects of solvent polarity and salt addition on β-phase poly(vinylidene fluoride) (PVDF) formation. Films were solvent cast in aprotic solvents of varying polarities with or without salt addition. Characterization was done by Fourier transformed infra-red spectroscopy, differential scanning calorimetry, and scanning electron microscopy. Decreasing fractions of β-phase PVDF was observed with increasing drying temperature when less polar solvents were used. The most polar solvent (hexamethylphosphoramide) consistently produced films with at least 90.0% β-phase PVDF within the crystalline regions. Melting temperatures increased in correlation to absolute proportions of β-phase PVDF. Salt addition increased the formation of β-phase PVDF by 30%, with salts of higher valencies and smaller ionic radii resulting in more significant increases. Taken collectively, using solvents of higher polarities and addition of salts with high cationic valencies and small ionic radii will maximize β-phase formation in solvent cast PVDF films. © 2012 Wiley Periodicals, Inc.

Research Area(s)

  • biomaterials, films, morphology

Citation Format(s)

Increasing solvent polarity and addition of salts promote β-phase poly(vinylidene fluoride) formation. / Low, Yuen Kei Adarina; Tan, Li Yi; Tan, Lay Poh et al.
In: Journal of Applied Polymer Science, Vol. 128, No. 5, 05.06.2013, p. 2902-2910.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review