Structural studies of polymers with hydrophilic spacer groups. 2. Infrared spectroscopy of Langmuir-Blodgett multilayers of polymers with fluorocarbon side chains at ambient and elevated temperatures

Schneider, J.; Erdelen, Christian H.; Ringsdorf, Helmut; Rabolt, John F.

doi:10.1021/ma00198a045

Cited by 78 publications

(41 citation statements)

References 9 publications

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“…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 strucn 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.…”

mentioning

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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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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“…Therefore, several sets of copolymers of fluorocarbon monomers with hydrophilic comonomers were prepared (Table I). The spreading behaviour of the resulting fluorocarbon spacer polymers corresponds qualitatively to their hydrocarbon analogues as discussed in detail elsewhere 20 . Figure 6 illustrates the monolayer behaviour of fluorocarbon amphiphiles 7a-7c, representative of this class of polymers.…”

Section: Langmuir-blodgett Multilayers From Ftuorocarbon Spacer Polymersmentioning

confidence: 70%

Thermal behaviour of polymeric Langmuir-Blodgett multilayers

Erdelen¹,

Laschewsky²,

Ringsdorf³

et al. 1989

Thin Solid Films

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Langmuir-Blodgett multilayers of hydrocarbon and fluorocarbon polymers with hydrophilic spacer, lipid-polyelectrolyte complexes and mesogenic polymers have been prepared. The thermal behaviour of the multilayers was studied by small angle X-ray scattering, IR and UV-visible spectroscopy. Good thermal stabilities were found for the various classes of polymers. In addition, for both complexed multilayers and mesogenic polymer films, reorientation processes were observed.

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“…Therefore, they suffer inevitably from thermal relaxation after deposition on solid substrates. In the last few decades, the thermal stability of Langmuir-Blodgett films has been examined by polarized infrared spectroscopy, 3,4 the optical second-harmonic generation method, 5 small-angle X-ray scattering, 6,7 X-ray reflectivity 8,9 and the energy transfer technique. 10,11 Several research groups reported the structural relaxation of polymer LangmuirBlodgett films in nanometer dimensions by thermal treatment and suggested that chain conformation was rearranged from a twodimensionally restricted form to a three-dimensional equilibrium conformation by the local motion of polymer segments.…”

Section: Introductionmentioning

confidence: 99%

Conformational relaxation of single polymer chains confined in a two-dimensional plane studied by scanning near-field optical microscopy

Aoki

Sekine

Iwamoto

et al. 2009

Polym J

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The conformational rearrangement of poly(methyl methacrylate) (PMMA) chains confined in a two-dimensional monolayer to a three-dimensional random coil was studied by the shape and segment density analysis of an individual PMMA chain, and was directly observed by scanning near-field optical microscopy. A perylene-labeled PMMA chain was dispersed in the unlabeled PMMA monolayer, after which it was placed on a thick film of unlabeled PMMA and annealed above the glass transition temperature. Although the polymer chain of the monolayer penetrated into the bulk substrate with thermal activation, the radius of gyration in the lateral direction was maintained throughout the annealing process. The diffusion rate in the depth direction was much faster than that of the translational diffusion of the entire polymer chains, suggesting that an unstable twodimensional conformation of the polymer chain relaxed into a three-dimensional one. This indicates that the polymer chains confined in a monolayer interlaced with the surrounding chains and expanded mainly toward the depth direction in the relaxation process, while maintaining the dimensions of the averaged radius of gyration in the lateral direction.

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Structural studies of polymers with hydrophilic spacer groups. 2. Infrared spectroscopy of Langmuir-Blodgett multilayers of polymers with fluorocarbon side chains at ambient and elevated temperatures

Cited by 78 publications

References 9 publications

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

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

Thermal behaviour of polymeric Langmuir-Blodgett multilayers

Conformational relaxation of single polymer chains confined in a two-dimensional plane studied by scanning near-field optical microscopy

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