Macroscopic frictional properties of poly(1-(2-methacryloyloxy)ethyl-3- butyl imidazolium bis(trifluoromethanesulfonyl)-imide) brush surfaces in an ionic liquid

Tatsuya Ishikawa, Motoyasu Kobayashi, Atsushi Takahara

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Poly(1-(2-methacryloyloxy)ethyl-3-butylimidazolium bis(trifluoromethanesulfonyl)imide) (PMIS) and poly(n-hexyl methacrylate) (PHMA) brushes were prepared on initiator-immobilized silicon wafers by surface-initiated atom transfer radical polymerization. The macroscopic frictional properties of the brushes were determined using a ball-on-flat type tribotester under reciprocating motion in a dry nitrogen atmosphere, water, methanol, and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMImTFSI). When the PMIS and PHMA brushes were exposed to EMImTFSI, the friction coefficient of the former was lower than that of the latter. It is thought that the high affinity of the PMIS brush to EMImTFSI led to a reduction in the interaction between the brush and the friction probe, which resulted in a low friction coefficient. The friction force of the PMIS brush in EMImTFSI was proportional to a normal load in the range of 0.2-0.98 N. The friction coefficient gradually decreased to 0.01 with an increase in the sliding velocity from 1×10-4 to 1×10-1 m s-1. The friction coefficient of the PMIS brush exhibited low magnitude until 800 friction cycles in the dry nitrogen atmosphere, whereas the PHMA brush was abraded away within 150 friction cycles. The XPS spectra of the worn surfaces on the PMIS brush suggested that the brush was gradually abraded by friction.

Original languageEnglish
Pages (from-to)1120-1128
Number of pages9
JournalACS Applied Materials and Interfaces
Volume2
Issue number4
DOIs
Publication statusPublished - Apr 28 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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