Micropatterning of semicrystalline poly(vinylidene fluoride) (PVDF) solutions

Youn Jung Park, Yong Soo Kang, Cheolmin Park

Research output: Contribution to journalArticle

138 Citations (Scopus)

Abstract

Micropatterning of a semicrystalline poly(vinylidene fluoride) (PVDF) solution was performed by a temperature controlled capillary micromolding where the rate of solvent evaporation was controlled by substrate temperature. In order to choose proper solvents for micropatterning, we have investigated the solubility of PVDF in various organic solvents and crystal structures of the PVDF bulk films cast from the solvents. The films prepared from the polar solvents such as dimethylformamide (DMF), dimethyl sulfoxide (DMSO) dominantly showed γ type crystals regardless of preparation temperature, while the films from tetrahydrofuran (THF) exhibit α type crystals and the ones from acetone and methyl ethyl ketone (MEK) show the characteristics of both α- and γ-PVDF. The quality of micropatterns and shapes of the PVDF crystals in the patterns significantly depend on solvent evaporation rates. Micropatterns of PVDF formed in DMF at 120 °C showed the best uniformity in shape. Crystals of the PVDF nucleated at the center regions of microchannels tended to be elongated with the b-axis of γ-PVDF crystals along the channels as the concentration of the solution decreased. In contrast, crystals nucleated at the corner regions of the channels had their b-axis oriented perpendicular to the channels. In line patterns with the width of 2 μm, the corner nucleated crystals were dominant and a resulting bamboo-like crystalline microstructure was observed in which the b-axis of γ-PVDF crystals, fast growth direction, is oriented normal to the microchannels. The crystal structures of the bulk films and the micropatterns were characterized by X-ray diffractometer, Fourier transform infrared spectroscope in Attenuated Total Reflection mode, Polarized Optical and Scanning Electron Microscope.

Original languageEnglish
Pages (from-to)1002-1012
Number of pages11
JournalEuropean Polymer Journal
Volume41
Issue number5
DOIs
Publication statusPublished - 2005 May 1

Fingerprint

vinylidene
fluorides
Crystals
crystals
Dimethylformamide
Microchannels
microchannels
Evaporation
Crystal structure
Bamboo
Dimethyl sulfoxide
polyvinylidene fluoride
Diffractometers
crystal structure
evaporation rate
Ketones
Acetone
Organic solvents
Temperature
tetrahydrofuran

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Polymers and Plastics
  • Organic Chemistry

Cite this

Park, Youn Jung ; Kang, Yong Soo ; Park, Cheolmin. / Micropatterning of semicrystalline poly(vinylidene fluoride) (PVDF) solutions. In: European Polymer Journal. 2005 ; Vol. 41, No. 5. pp. 1002-1012.
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Micropatterning of semicrystalline poly(vinylidene fluoride) (PVDF) solutions. / Park, Youn Jung; Kang, Yong Soo; Park, Cheolmin.

In: European Polymer Journal, Vol. 41, No. 5, 01.05.2005, p. 1002-1012.

Research output: Contribution to journalArticle

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