Preparation and Performance Study of Hygroscopic Film

摘要

PVA hydroscopic films were prepared by solution and tape casting method. PVA 1799 was selected as the best material of hygroscopic film. This work evaluated the effect of PVA concentration, glycerol and methylcellulose (MC) on mechanical property, transmittance and absorbability of the film. The result showed that the transmittance of PVA film was high, and that plasticizer and MC had little effect on it; while the addition of MC affected the haze of PVA film greatly, the haze increased along with the increasing of adding amount of MC. The suitable concentration of PVA, glycerol and MC was 7%, 0.8%, 0.18%, respectively.