期刊
RADIATION PHYSICS AND CHEMISTRY
卷 78, 期 1, 页码 1-7出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2008.08.003
关键词
Radiation grafting; Polypropylene (PP); 4-Vinylpyridine (4VP); N-isopropylacrylamide (NIPAAm); LCST; pH critical
资金
- DGAPA-UNAM [IN200208]
Here 4-vinylpyridine (4VP) was grafted onto polypropylene films (PP) by mutual irradiation method to give PP-g-4VP: N-isopropylacrylamide (NIPAAm) was then grafted onto the PP-g-4VP films to give (PP-g-4VP)-g-NIPAAm by pre-irradiation method, using a Co-60 gamma-source. The dependence of grafting percentage on radiation dose, temperature, reaction time, and monomer concentration was studied. (PP-g-4VP)-g-NIPAAm films were characterized by infrared spectroscopy (FTIR-ATR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The critical PH point and lower critical solution temperature (LCST) were determined by swelling and water contact angle measurements. The LCST also was determined by DSC. The binary graft copolymer films are shown to be thermo-pH sensitive. (C) 2008 Elsevier Ltd. All rights reserved.
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