P 4447 (OTTO) Poly(N-isopropylacrylamide) average Mn 30000 Cas 25189-55-3 - used in the formation of a smart hydrogel, which finds potential usage in sensors, fuel cells, supercapacitors, and lithium-ion batteries. P 2823 (OTTO) Poly(N-isopropylacrylamide) average Mn 85,000 Cas 25189-55-3 - used in the fabrication of molecular nanothermometer.