CELLULOSE POLYVINYL-ALCOHOL) BLENDS PREPARED FROM SOLUTIONS IN N,N-DIMETHYLACETAMIDE LITHIUM-CHLORIDE

Blend films of cellulose with poly(vinyl alcohol) (PVA) were prepared from mixed solutions in N,N-dimethylacetamide (DMAc)-lithium chloride (LiCl) by coagulation in a nonsolvent. The state of miscibility of the clear films obtained over the entire composition range was characterized by wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and dynamic mechanical measurements. The WAXD and DSC results indicate that the crystallinity of PVA decreased drastically with increasing cellulose content and it exhibited no tendency to crystallize in the blends containing more than 70 wt% cellulose.