Solidification Behavior of Polymer Solution during Membrane Preparation by Thermally Induced Phase Separation
AbstractThe 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. View Full-Text
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
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.
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.