Direct modification of polyolefin films by surface-initiated polymerization of a phosphobetaine monomer

Autor:	Atsushi Takahara, Junji Saito, Norio Kashiwa, Jun Ichi Imuta, Tomoaki Matsugi, Motoyasu Kobayashi
Rok vydání:	2013
Předmět:	Polypropylene Materials science Polymers and Plastics Organic Chemistry Radical polymerization Bioengineering Polyethylene Biochemistry Polyolefin Contact angle chemistry.chemical_compound Monomer chemistry Polymerization Polymer chemistry Wetting Composite material
Zdroj:	Polym. Chem.. 4:731-739
ISSN:	1759-9962 1759-9954
DOI:	10.1039/c2py20712e
Popis:	The surfaces of polyethylene and polypropylene sheets were modified by grafting with polymeric brushes formed from a phosphobetaine monomer. Pressed sheets of bromo-functionalized polyethylene or polypropylene macroinitiators (PE-MIs and PP-MIs, respectively) were used to initiate the atom-transfer radical polymerization of 2-(methacryloyloxy)ethyl phosphorylcholine (MPC) under mild conditions to form a superhydrophilic grafted surface layer. The grafted polyolefin sheets showed excellent wettability and oil-detachment behaviour in water. Even three years after surface grafting had been performed, the PMPC-g-PP sheet retained a water contact angle of less than 10°. Furthermore, the water contact angle of the PMPC-g-PP sheet remained as low as 12° after it had been annealed at 373 K for 60 min under reduced pressure. Dynamic friction tests performed on the PMPC-g-PE sheet by sliding it against a glass ball revealed a marked reduction in the friction coefficient in water at sliding velocities in the range of 10−5 to 10−1 m s−1, possibly as a result of lubrication by water.
Databáze:	OpenAIRE
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