Liquid-state transitions (T>T g) of poly(vinyl alcohol)

The two liquid state transitions,T_ll andT_ll, of non-crystalline, uncrosslinked poly(vinyl alcohol) were determined by differential scanning calorimetry.T_ll increased as the molecular weightM_n increased, whileT_ll remained almost constant. Crosslinking and crystallinity lead to disappearance of the transitionT_ll. The transitionT_ll was linked to mobility of whole chains, whereasT_ll was characteristic of segmental mobility.