The result of experiments indicates that the rate releasing F- is moderate for anticaries drug, which is covered with modified microporous polypropylene film.

Surface engineering of microporous polypropylene membranes;

A novel polypropylene based interpenetrating polymer networks(IPN) was prepared via insitu copolymerization of mixed monomers within the pores of a microporous polypropylene membrane.

Microporous polypropylene membrane has many desirable properties including high void volumes, well-controlled porosity, chemical intertness and low cost.

Adhesion of polypropylene film and copper foil;

Due to the technical limitations,polypropylene film could encounter many kinds of uneven mechanical stress when in the producted process like stretching,winging,splitting and convoluting the roll of high-voltage energy storage capacitor,the stress could cause wrinkles,electric weakness and even mechanical damage,in another words,insulative defects.

The influence of low temperature plasma treatment under different conditions on the interfacial bonding of PTFE micro-pore membrane is studied by using X-ray Photoelectron Spectroscopy(XPS) and dynamic contact angle analyzer and SEM etc instruments.