Abstract
Isothermal crystallization of PVA was studied by differential scanning calorimeter (DSC). Sigmoidal shapes of the isotherms for crystallization of PVA obtained at different temperatures of 205°C to 223°C are very similar to one another and are superposable.
The value of exponent n in Avrami's equation of PVA is 1.75±0.25 irrespective of degree of polymerization and configuration of PVA. The value of n for mixture of PVA and triethylene glycol is 3.82. This value suggests that spherulites are grown. Half time of crystallization is dependent remarkably on the crystallization temperature and degree of polymerization. Multipeaks are observed in DSC thermogram of PVA film which was stepwise annealed.
