Membranes 2014, 4(1), 113-122; doi:10.3390/membranes4010113
Article

Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation

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Received: 10 January 2014; in revised form: 10 February 2014 / Accepted: 14 February 2014 / Published: 28 February 2014
(This article belongs to the Special Issue Selected Papers from AMS8 Conference (July 2013, Xi’an, China))
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The solidification behavior of poly(vinylidene fluoride) (PVDF) solution during membrane preparation by thermally induced phase separation (TIPS) was investigated. Apparatus newly developed in our laboratory was used to quantitatively measure membrane stiffness during phase separation. In this apparatus, a cooling polymer solution, placed on a stage, is moved upwards and the surface of the polymer solution contacts a sphere attached to the tip of a needle. The displacement of a blade spring attached to the needle is then measured by a laser displacement sensor. Different phase separation modes, such as liquid-liquid (L-L) phase separation and solid-liquid (S-L) phase separation (polymer crystallization) were investigated. In the case of S-L phase separation, the stiffness of the solution surface began to increase significantly just before termination of crystallization. In contrast, L-L phase separation delayed solidification of the solution. This was because mutual contact of the spherulites was obstructed by droplets of polymer-lean phase formed during L-L phase separation. Thus, the solidification rate was slower for the L-L phase separation system than for the S-L phase separation system.
Keywords: solidification rate; membrane preparation process; thermally induced phase separation; poly(vinylidene fluoride)
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MDPI and ACS Style

Ishigami, T.; Nii, Y.; Ohmukai, Y.; Rajabzadeh, S.; Matsuyama, H. Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation. Membranes 2014, 4, 113-122.

AMA Style

Ishigami T, Nii Y, Ohmukai Y, Rajabzadeh S, Matsuyama H. Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation. Membranes. 2014; 4(1):113-122.

Chicago/Turabian Style

Ishigami, Toru; Nii, Yoko; Ohmukai, Yoshikage; Rajabzadeh, Saeid; Matsuyama, Hideto. 2014. "Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation." Membranes 4, no. 1: 113-122.

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