Abstract
New cooling paints were developed by exploiting the vaporization heat of water. These systems were prepared using various ratios of three copolymer components N-isopropylacrylamide (NIPAAm), butyl acrylate (BA), and N,N-dimethylacrylamide (DMAAm). The homopolymer of NIPAAm dissolves in water below about 32°C (hydrophi lic) and becomes insoluble above this temperature (hydrophobic). On the basis of the hydrophobic/hydrophilic switch of NIPAAm polymers, cooling paints consisting of copolymers of NIPAAm with coating materials were investigated. Copolymers of NIPAAm with BA (NIPAAm-co-BA) showed cooling effects; however, the hydrophobic/hydrophilic switch temperature decreased with the BA ratio. Copolymerization of NIPAAm-co-BA and DMAAm allowed us to adjust the switch temperature to about 30°C. In
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