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Poly(N-isopropylacrylamide) (variously abbreviated PNIPA, PNIPAAm, PNIPAA or PNIPAm) is a temperature-responsive polymer that was first synthesized in the 1950s.[1]

It forms a three-dimensional hydrogel when crosslinked with N,N¡¯-methylene-bis-acrylamide (MBAm) or N,N¡¯-cystamine-bis-acrylamide (CBAm). When heated in water above 33¡ãC, it undergoes a reversible phase transition from a swollen hydrated state to a shrunken dehydrated state, losing about 90% of its mass. Since PNIPAm expels its liquid contents at a temperature near that of the human body, PNIPAm has been investigated by many researchers for possible applications in controlled drug delivery.[2][3]

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https://en.wikipedia.org/wiki/Poly(N-isopropylacrylamide)

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