Structural analysis of transferred monolayers of high-molecular-weight polyvinyloctadecyl ether

Lovelock, Brendan.; Grieser, Franz; Sanders, J. V.

doi:10.1016/0021-9797(85)90268-1

Cited by 8 publications

(8 citation statements)

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“…40 Calculating the area per monomeric unit that a 10/1 double helix of isotactic PMMA would occupy, on the basis of the crystal parameters reported in literature (helix diameter 12.5 A, pitch 21.1 A), yields a value of 13.2 A2/ monomeric unit. 42 When we extrapolate the posttransition region (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) mN/m) of an isotherm that was recorded stepwise with the film being allowed to stabilize at each pressure to eliminate kinetic effects, we find, upon extrapolation to zero pressure, a specific area of 14.5 A2/ monomeric unit, which approaches the calculated value for the double-helical structure. A deviation to the high area side of this extrapolated value can easily be caused by the presence of a small fraction of "¡amorphous" material with a high surface compressibility.…”

Section: Resultsmentioning

confidence: 64%

Thin-film behavior of poly(methyl methacrylates). 1. Monolayers at the air-water interface

Brinkhuis¹,

Schouten²

1991

Macromolecules

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The monolayer behavior of PMMA of varying tacticities at the air-water interface was studied. A difference in lateral cohesive energy is argued to be responsible for the fact that the pressure area isotherms of isotactic PMMA deviate strongly from those of syndiotactic PMMA. At low surface pressures the isotactic PMMA monolayer can be characterized as an expanded type monolayer, whereas syndiotactic PMMA forms a condensed type monolayer. At areas of about 20 AZ/monomeric unit a transition can be observed in the pressure-area isotherm of isotactic PMMA. This transition was studied as a function of molecular weight, temperature, and compression speed. From the results it is deduced that the transition corresponds to a two-dimensional pseudocrystallization process in which the isotactic PMMA assumes a double-helix conformation in the monolayer, similar to the three-dimensional crystal structure. From an Avrami analysis it is inferred that the kinetics of this crystallization can be described by an activated nucleation, followed by a one-dimensional growth.

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Section: Resultsmentioning

confidence: 64%

Thin-film behavior of poly(methyl methacrylates). 1. Monolayers at the air-water interface

Brinkhuis¹,

Schouten²

1991

Macromolecules

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Section: Introductionmentioning

confidence: 99%

“…[5][6][7] For the fabrication of polymeric LB films, comb-like polymers with well-defined hydrophilic groups and hydrophobic hydrocarbon side chains are mostly studied. [8][9][10][11][12][13][14] Monolayer formation and LB film preparation in these polymers are determined by the balance of hydrophilic and hydrophobic interactions.Langmuir-Blodgett films of comb-like polymers with fluorocarbon side chains are attracting much recent attention due to their characteristic properties such as low friction, excellent insulation, excellent durability, and so on. 15,16 The fluorocarbon chains are also hydrophobic and have rigid character (stiffness of the C-F bond), which are suitable factors for stable monolayer formation.…”

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confidence: 99%

Preparation and Characterization of Poly(N-1H,1H- pentadecafluorooctylmethacrylamide) Langmuir-Blodgett Film

Aminuzzaman

Kado

Mitsuishi

et al. 2003

Polym J

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ABSTRACT:The monolayer behavior of poly(N-1H,1H-pentadecafluorooctylmethacrylamide (pC7F15MAA) spread on the air-water interface was investigated by measurement of surface pressure-area isotherm at different subphase temperatures. The monolayer of pC7F15MAA was transferred onto solid substrates as Y-type Langmuir-Blodgett (LB) film and the monolayer thickness was calculated by X-Ray diffraction techniques and surface plasmon measurements. Wettability and the surface structure of the LB film were investigated by measuring the static contact angle (cos θ) of water on the surface. The wettability varied slightly with increasing temperature. The critical surface tension measurement suggests that the surface of pC7F15MAA LB film covered mainly with CF 3 groups.KEY WORDS Langmuir-Blodgett Film / Fluorinated Polymer / Surface Plasmon Resonance / Wettability / The Langmuir-Blodgett (LB) technique is an excellent method for preparation of ultrathin films with controlled thickness at a molecular size and well-defined molecular orientation. 1 Recently, polymeric LB films have received much attention due to their superior mechanical and thermal stability than those of low molecular weight LB films 2 and the applications especially in the fields of coatings, optics, and electronics have been discussed. 3,4 The simplest method to fabricate the polymeric LB film is by deposition of preformed polymer monolayers. [5][6][7] For the fabrication of polymeric LB films, comb-like polymers with well-defined hydrophilic groups and hydrophobic hydrocarbon side chains are mostly studied. [8][9][10][11][12][13][14] Monolayer formation and LB film preparation in these polymers are determined by the balance of hydrophilic and hydrophobic interactions.Langmuir-Blodgett films of comb-like polymers with fluorocarbon side chains are attracting much recent attention due to their characteristic properties such as low friction, excellent insulation, excellent durability, and so on. 15,16 The fluorocarbon chains are also hydrophobic and have rigid character (stiffness of the C-F bond), which are suitable factors for stable monolayer formation. However, the deposition of the monolayer on solid substrates is difficult because of the weak interactions among the monolayer due to the low surface energy of fluorinated materials. Nonetheless, a few papers have been reported about monolayers and the fabrication of LB films from comb-like polymers with fluorocarbon side chains. [17][18][19][20][21] In previous works, we have found that polyacrylamide struc- ture is suitable for stable LB film formation due to the self-assembly property based on hydrogen bonding of amide group. 14,22,23 Using this excellent property of the acrylamide backbone, we have demonstrated that poly(N-fluoroalkylacrylamide)s form stable monolayers at the air-water interface and fairly uniform polymer LB films can be easily prepared. 24 In this work, we investigated the spreading behavior of poly(N-1H,1H-pentadecafluorooctylmethacrylamide) (Figure 1) on the water surface to prepare st...

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“…If this is not the case, when a Langmuir film is formed any blocks of hydrophilic groups will coil up in the aqueous subphase and any blocks of lipophilic groups will coil up above the water surface, lb multilayers prepared from such films would be most unlikely to be highly ordered. Polymers that appear to meet this requirement and that have been studied as Langmuir films include (see table 1 and diagrams below) poly(acrylate)s 3 (Crisp 1958;Winter et al 1985), poly (methacrylate) s 4 (Crisp 1958;Puggelli & Gabrielli 1977;Winter et al 1985), poly(vinyl esters) 5 (Puggelli & Gabrielli 1977), and poly(vinyl ethers) 6 (Lovelock et al 1985). However, in all these polymers the hydrophilic groups (ester or ether) are relatively weakly hydrophilic.…”

Section: Some Examples Of Polymerizable Amphiphilesmentioning

confidence: 99%

Preformed polymers for Langmuir—Blodgett films

Hodge

Davis

Tredgold

1990

Phil. Trans. R. Soc. Lond. A

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Langmuir-Blodgett (LB) films of simple molecules are usually fragile and this has prompted the study of polymeric lb films. Films have been prepared successfully from preformed polymers that are derivatives of various vinyl-maleic anhydride alternating copolymers. By using a computer-controlled trough polymeric films containing several hundred layers have been prepared. Low-angle X-ray scattering studies indicate that the films have a regular layer structure. By using a specially constructed trough, multilayers have been prepared in which alternate layers are polymeric, LB films prepared from polymers containing appropriate vinyl groups can be crosslinked by ultraviolet light or an electron beam (EB). This not only further stabilizes the films and renders them insoluble, but also allows patterns to be ‘ drawn ’ in the films. Films of these polymers have been used as submicrometre EB resists. Films suitable for second harmonic generation and electro-optic modulation have been prepared. Some further applications of polymeric LB films are outlined.

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Structural analysis of transferred monolayers of high-molecular-weight polyvinyloctadecyl ether

Cited by 8 publications

References 4 publications

Thin-film behavior of poly(methyl methacrylates). 1. Monolayers at the air-water interface

Thin-film behavior of poly(methyl methacrylates). 1. Monolayers at the air-water interface

Preparation and Characterization of Poly(N-1H,1H- pentadecafluorooctylmethacrylamide) Langmuir-Blodgett Film

Preformed polymers for Langmuir—Blodgett films

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