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Abstract
Responsive polymers have been explored for both fundamental and applied studies due to their ability to undergo conformational and chemical changes upon receiving an external stimulus. In this work, we report the wetting behavior of thermoresponsive poly(N-isopropylacrylamide-block-styrene) diblock copolymer films, below and above the lower critical solution temperature of poly(N-isopropylacrylamide) studied using contact angle measurements. The water contact angle determined for the 2 wt% films at 27°C is found to be 24° and 57° at 40°C. Though the water contact angle showed a systematic increase with increasing temperature, it never crossed to the hydrophobic domain. This infers that the PNIPAM chains lie in the corona of the poly(N-isopropylacrylamide-block-styrene) micelles. Here, we show that a temperature tunable surface can be obtained by coating a surface with poly(N-isopropylacrylamide-block-styrene) block copolymer; however, the response lies within the limits of hydrophilicity.
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