In order to develop temperature-responsive dispersing systems, we have grafted poly(N-isopropylacrylamide) (PNIPA), which is a temperature-responsive polymer having a lower critical solution temperature (LCST) at 32 °C, onto carbon black (CB) by plasmainduced graft polymerization technique. CB was treated with HO and/or 02 plasma, to which aqueous solution of the monomer (NIPA) was introduced, resulted in simultaneous graft polymerization. The dispersibility of the PNIPA-grafted CB in water at 25 and 35 °C was investigated by the measurement of the transmittance of visible light (500 nm). The most of the PNIPA-grafted CB showed better dispersibility at 25 °C (below the LCST) than at 35 °C (above the LCST). In many graft polymerization conditions, CB grafted in 2 wt% of the monomer concentration with ultrasonic irradiation at room temperature showed the most clear temperature response of the dispersibility in water.
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