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《Acta Polymerica Sinica》 2002-06
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PREPARATION AND SURFACE MORPHOLOGY OF PNIPAAm-GRAFTED LAYERS ON POLYPROPYLENE FILMS

LI Bin, CHEN Wenguang, WANG Xiaogong, ZHOU Qixiang (Department of Chemical Engineering,Tsinghua University,Beijing 100084)  
N-Isopropylacrylamide (NIPAAm) was introduced onto the surface of polypropylene (PP) films to form a layer of poly(N-isopropylacrylamide) (PNIPAAm) by UV-induced surface photograft polymerization reaction.Improvement on UV intensity and reaction temperature favored the increase of the grafting yield,yet it went through a maximum as monomer concentration was increased.Two photograft techniques,the xanthen-9-one pre-dipping method and dormant radical method,were tried and higher grafting yields were achieved by the latter.The existence of PNIPAAm grafted polymer layer was confirmed by FTIR,ESCA and SEM measurements.The acrylamide band I and II in FTIR spectra of the grafted polymer shifted as the temperature changed,which revealed the temperature sensitivity of the grafted films.Moreover,a special sphere-like surface morphology of the NIPAAm layers due to the temperature-responsive behaviors was observed by SEM.
【Fund】: 国家自然科学基金资助项目 (基金号 5 992 5 30 9)
【CateGory Index】: TQ316.3
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