  We develop thin films of blends of polystyrene (PS) with the thermoresponsive
polymer poly(N-isopropylacrylamide) (PNIPAM) (PS/PNIPAM) and its diblock
copolymer polystyrene-b-poly(N-isopropylacrylamide) (PS/PS-b-PNIPAM) in
different blend ratios and we study their surface morphology and
thermoresponsive wetting behaviour. The blends of PS/PNIPAM and PS/PS-b-PNIPAM
are spin-casted on flat silicon surfaces with various drying conditions. The
surface morphology of the films depends on the blend ratio and the drying
conditions. The PS/PS-b-PNIPAM films do not show an increase of their water
contact angles with temperature, as it is expected by the presence of the
PNIPAM block. All PS/PNIPAM films show an increase in the water contact angle
above the lower critical solution temperature of PNIPAM, which depends on the
ratio of PNIPAM in the blend and is insensitive to the drying conditions of the
films. The difference between the wetting behaviour of PS/PS-b-PNIPAM and
PS/PNIPAM films is due to the arrangement of the PNIPAM chains in the film.
