The effects of nitrogen (N2) pressure on amphiphilic di-block copolymer, PEO114-b-PMA(Az)40, were investigated by scanning transitiometry. The isotropic transition temperature increased with the increase of pressure
above 20 MPa. The hydrostatic pressure effects evaluated with the Clapeyron equation were smaller than the value obtained
by mercury as a pressurizing medium because the amount of absorbed gas decreases the volume change at the isotropic transition.