Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 106, Issue 1, Pages 621-629Publisher
WILEY
DOI: 10.1002/app.26610
Keywords
surfaces; graft copolymers; photopolymerization; photografting; multifunctional monomer
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A surface photografting polymerization (lambda > 300 nm) of a multifunctional monomer which was trimethylolpropane triacrylate (TMPTA), was conducted with benzophenone (BP) as photoinitiator and LDPE as model substrate, in mixed solvents containing tetrahydrofuran (THF) and water. Proved by ATR-IR, highly crosslinked grafted layer was generated rapidly under UV irradiation. Effects on percent conversion of grafting are detailed with, such as feed ratio of BP to TMPTA, mass percent of TMPTA in the reaction system, mass percent of water in the mixed solvents and addition of the second monomer, methyl methacrylate (MMA). As both verified by SEM and AFM, relatively planar grafted layer was produced when photografting was carried out merely in THF; adding water in the reaction system caused the formation of craters in the grafted layer. In addition, effects of mass percent of water in the mixed solvents, UV irradiation time, TMPTA concentration and addition of MMA on the size, shape and quantity of the craters were investigated by SEM. A plausible mechanism for the formation of craters is also proposed. (c) 2007 Wiley Periodicals, Inc.
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