1School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
2TOSOH Analysis and Research Center Co., 1-8 Kasumi, Yokkaichi, Mie 510-8540, Japan
Adv. Mater. Lett., 2018, 9 (12), pp 872-875
DOI: 10.5185/amlett.2018.2128
Publication Date (Web): Sep 14, 2018
Copyright © IAAM-VBRI Press
E-mail: m_yama@jaist.ac.jp
We evaluated the effect of adding a small amount of poly(N-isopropylacrylamide) (PNIPAM), which is a temperature-sensitive polymer, on the glass transition temperature (Tg) of poly(vinyl acetate) (PVAc). The Tg of a blend comprising 5wt.% PNIPAM was affected by the ambient temperature; the Tg was low when the blend was stored at low temperatures and high when it was stored at high temperatures. This phenomenon can be attributed to the hydrophilic–hydrophobic transition of the PNIPAM. At low temperatures, the moisture content of the blend increased, resulting in a low Tg because of the plasticizing effect of water molecules on the PVAc. Because the material becomes soft at low temperatures, this unique property can be exploited in the design of smart materials.
Poly(N-isopropylacrylamide), poly(vinyl acetate), smart polymer, polymer blend.
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