The relationship between FTIR spectra of PVA film and its heat preservation capability

Polyvinyl alcohol(PVA),polyethylene(PE) and e thylene-vinyl acetate copolymer(EVA) film was prepared.The optic capability, i nfrared transmittance and heat preservation capability of the films were studied respectively.The result indicated that the haze degree of the PVA film decreas ed about 15% and 12% than PE film and EVA film;PVA film transmittance of IR was more or less than other films in the 7～14 μm wavelength range so that the tem p erature of greenhouse could be increased effectively in daylight.It was just 16.2% about 20% less than EVA film,and 50% less than PE film.The PVA film could be used as agricultural film in greenhouse to promote heat preservation perform ance greatly.