title: Effect of the graft chain length and density on the morphology of radiation-modified polysilane monolayers at the air/water interface.
abstract: The variation in the morphology of monolayers at the air/water interface is investigated for two kinds of radiation-modified polysilanes with different structures: poly(diethyl fumarate)-grafted poly(methyl-n-propylsilane) (PMPrS-g-PDEF) and maleic anhydride-grafted PMPrS (PMPrS-g-MAH). PMPrS-g-PDEF has long but sparsely-attached PDEF graft chains, while PMPrS-g-MAH has short but densely-attached MAH graft units. Surface pressure-area measurements indicate that PMPrS-g-PDEF monolayers extensively spread at the air/water interface though PMPrS homopolymer hardly spreads. AFM observation reveals that PMPrS-g-PDEF monolayers have an inhomogeneous structure containing string-like microstructures. This result suggests that PMPrS main chains are detached from the water surface to aggregate together and only PDEF chains spread over the water surface. In contrast, PMPrS-g-MAH forms uniform monolayers with a smooth surface. PMPrS main chains of PMPrS-g-MAH are anchored to the water surface by densely grafted MAH units. It is also demonstrated that only the PMPrS-g-MAH monolayers are successfully deposited layer-by-layer on a solid substrate by the Y-type deposition.
authors.affiliation: Research Reactor Institute, Kyoto University, Sennan-gun, Osaka, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Tanaka
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Kunai
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Sato
authors.forename: Tomochika
authors.initials: T
authors.lastname: Matsuyama
mesh_terms: D000388:Air; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D011108:Polymers; D012821:Silanes; D014867:Water