Formation of polyketone particle structure by hexafluoroisopropanol solvent evaporation and effects of plasticizer addition |
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| Authors: | Hong Xia Yoshio Hashimoto Toru Morita Toshihiro Hirai |
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| Institution: | 1. Smart Materials Engineering, Faculty of Textiles and Technology, Shinshu University, , Ueda, Nagano, 386‐8567 Japan;2. Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, , Nagano, Nagano, 380‐8553 Japan;3. R & D Laboratory for Fiber & Textiles Technology, Asahi Kasei Fibers Corporation, , Nobeoka, Miyazaki, 882‐0031 Japan |
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| Abstract: | Few solvents are capable of dissolving polyketones (PKs). 1,1,1,3,3,3‐Hexafluoro‐2‐propanol (hexafluoroisopropanol, HFIP) is a better solvent than trifluoroethanol and m‐cresol. When HFIP was evaporated from a PK/HFIP solution, a porous cast‐film with a microparticle structure was formed because the isotactic PKs adopted a helical conformation, and convection during evaporation of the high polarity and low‐boiling‐point HFIP caused aggregation and rolling of the polymer molecules. The addition of plasticizer suppressed particle formation, improving the surface structure and mechanical properties of the film. In particular, the dielectric properties of the film improved significantly. This will enable PKs, which are rigid insulating materials, to be used as dielectric materials, broadening their range of applications. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014 , 52, 887–892 |
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| Keywords: | films FTIR helical conformation HFIP particle size distribution particle structure phase behavior plasticizer DBA poly(ether ketones) polyketone |
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