According to gas and water vapor permeability of thin polymer film made from polyolefin material,gas and water va-por permeability mechanism and law of homogeneous membrane and non-homogeneous membrane for modified atmosphere packaging of fruits and vegetables was studied.

The influences of crystalline grains and crystalline boundaries inside the P(VDF/TrFE) polymer films obtained on the optical properties were improved.

A new method has been developed to measure electro-optic coefficients of poled polymer film based on the combination of transmission spectum and absorption spectrum.

Model of effective refractive indices of nanoporous polymer films;

The common methods and their principles for determination of the electro optic coefficients of NLO polymer thin films are summarized,and the typical experimental arrangements are presented.