Preparation of Temperature-sensitive Polypropylene Films by Surface Photografting Technique

摘要

In recent years, many kinds of temperature-sensitive Poly(N-isopropylacrylamide) and its copolymer hydrogels with other acrylic monomers have been synthesized. These hydrogels show a unique Lower Critical Solution Temperature (LCST) near 32℃ in aqueous solution. They could be used in various fields such as controlled drug delivery system, biocatalysis and actuators. Besides of being used for hydrogels, N-isopropylacrylamide (NIPAAm) monomer can be grafted to polymer substrates by electron beam, irradiation or UV-initiated graft polymerization to achieve special modification on their surfaces. Some researchers have grafted NIPAAm on porous polymer films such as LDPE, PP or polyamide. But few efforts have been put on photografting of NIPAAm on non-porous PP films. In this article we will report our previous work on this field. NIPAAm has been grafted on PP films by two kinds of methods: pre-dipping photografting and dormant radical photografting. The water absorbency of grafted films was investigated.