ffect of pressure on the swelling of three different tffoperature-sensitivegels was studied. The gels used were polyp - isopropylacrylamide) (I

NIPA)

pci Y (N-n - propylacrylamide) (PNNPA) and poly (N

N - dirthylacrylamide)(PNDEA). It was found that both PNNPA gel and PNDEA gel are pressure sensi tive

as PNIPA gel is

in a SPedal ration of tffeperature

and that this phenomenon is caused by the variation of their volume phase transition tffeperatllre withpressure.