The crystallization behaviour of poly (vinyl alcohol) (PfAl)/poly (vinyl pyrrolidone) (PVP) blends was investigated by using DSC

WAXD and SAXS. The crystallinity of PVA1 was decreased with increasing of the content of PVP and there was no any crystallinity when the content of PVA1 was less then 50 wt.%. Comparing with plain PVA1 the difference between Tm

and Tg of blends was low which emerged that PVP could prohibit the crystallization of PVA1 in blends. The kinetic crystallization behaviour could be deseribed by Avrami equ-ation. The rate of crystallization of PVAl in blends was slower than plain PVAl which could be verified by the facts that the supercooling of blends was increased and the growing rate of spherulites and the kinctic constant were decreased. Long spacings

the thicknesses of lamellae and transition layers of annealing samples were higher than unannealing one.The composition had a dramatic influence on long spacings

some extent of influence on the thickness of lamcllae and little on the thicknesr of transition layers.