期刊
MACROMOLECULES
卷 55, 期 6, 页码 2160-2170出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.1c02653
关键词
-
资金
- National Natural Science Foundations of China [21873059, 22022501, 21774010, 22073006]
A simple and efficient approach for preparing gamma-PVDF films has been developed using the spontaneous diffusion of ionic liquids into the alpha-PVDF matrix. The alpha-gamma' phase transition was found to be faster and more efficient for high-temperature prepared samples.
In this work, a simple and efficient approach has been developed for preparing gamma-PVDF films with a wide range of thickness based on the spontaneous diffusion of ionic liquids (ILs) into the alpha-PVDF matrix. It involves three steps: (i) preparation of alpha-PVDF films, (ii) surface coating of the resultant alpha-PVDF films with ionic liquids or quaternary ammonium solution, and (iii) annealing the surface modified PVDF thin film at a high temperature. In this way, the original alpha-PVDF film is then transferred into a gamma-rich one through the well-known alpha-gamma' phase transition. The alpha-gamma' transition is found to be much faster and more efficient for high-temperature prepared samples. It has been further confirmed that the alpha-gamma' phase transition includes the induction and slow phase transition stages for low-temperature fabricated samples as well as the rapid and then slow transition stages for the samples prepared at 120 and 150 degrees C.
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