Poly atomic force spectroscopy

Figure 9.24 Force curve obtained when extending chains ofPOEA from the chrome surface in water with frequency of jumps < 1 pm s I no tip-POEA interactions II film being compressed lll/IV repulsive contact with the substrate V pull-of force due to surface adhesion VI cantilever pulls off the surface VII attractive peak due to stretching of POEA chains. (Reprinted with permission from Microscopy and Microanaiysis, Atomic Force Spectroscopy on Poly(o-ethoxyaniline) Nanostructured Films Sensing Nonspecific Interactions byF.L. Leite, C.E. Borato, W.T.L. da Silva, P.S.P. Herrmann, O.N. Oliveira Jr., L.H.C. Mattoso, 13, 304 (Copyright 2007).

F.L. Leite, C.E. Borato, W.T.L Silva, P.S.P Herrmann, O.N. Oliveira Jr, and L.H.C. Mattoso, Atomic force spectroscopy on poly(o-ethoxyaniline) nanostructured films sensing nonspecific interactions, Microsc. Microanal., 13, 304-312 (2007). 

We reported the synthesis of Si/Si02//PS-h-poly(acrylate) tethered diblock copolymer brushes [31,32,46,47]. The properties of these diblock brushes were studied using water contact angles, ellipsometry. X-ray photoelectron spectroscopy (XPS), FTIR spectroscopy and atomic force microscopy (AFM). For a sample with a 26 nm PS layer and a 9 nm PMMA layer, the advanc-... 

Abbreviations y x AFM AIBN BuMA Ca DCP DMA DMS DSC EGDMA EMA EPDM FT-IR HDPE HTV IPN LDPE LLDPE MA MAA MDI MMA PA PAC PB PBT PBuMA PDMS PDMS-NH2 interfacial tension viscosity ratio atomic force microscopy 2,2 -azobis(isobutyronitrile) butyl methacrylate capillary number dicumyl peroxide dynamic mechanical analysis dynamic mechanical spectroscopy differential scanning calorimetry ethylene glycol dimethacrylate ethyl methacrylate ethylene-propylene-diene rubber Fourier transform-infra-red high density polyethylene high temperature vulcanization interpenetrating polymer network low density polyethylene linear low density polyethylene maleic anhydride methacrylic acid 4,4 -diphenylmethanediisocyanate methyl methacrylate poly( amide) poly( acrylate) poly(butadiene) poly(butylene terephtalate) poly(butyl methacrylate) poly(dimethylsiloxane) amino-terminated poly(dimethylsiloxane)... 

The materials analyzed were blends of polystyrene (PS) and poly(vinyl methyl ether) (PVME) in various ratios. The two components are miscible in all proportions at ambient temperature. The photooxidation mechanisms of the homo-polymers PS and PVME have been studied previously [4,7,8]. PVME has been shown to be much more sensitive to oxidation than PS and the rate of photooxidation of PVME was found to be approximately 10 times higher than that of PS. The photoproducts formed were identified by spectroscopy combined with chemical and physical treatments. The rate of oxidation of each component in the blend has been compared with the oxidation rate of the homopolymers studied separately. Because photooxidative aging induces modifications of the surface aspect of the material, the spectroscopic analysis of the photochemical behavior of the blend has been completed by an analysis of the surface of the samples by atomic force microscopy (AFM). A tentative correlation between the evolution of the roughness measured by AFM and the chemical changes occurring in the PVME-PS samples throughout irradiation is presented. 

IR has been used in addition to many other techniques to anaiyze poiymer and copoiymer compositions, either by itseif or in addition to other techniques. Recentiy, the characterization by spatiai differentiation of submicrometer domains in poly(hydroxyalkanoate) copolymer by the combination of atomic force microscopy (AFM) and IR spectroscopy was reported [9, 10]. This new capability resulting from the combination of two single instruments enables the spectroscopic characterization of microdomainforming polymers at levels not previously possible. 

H.J. Lee and S.M. Park, Electrochemistry of conductive polymers. 33. Electrical and optical properties of electrochemically deposited poly(3-methylthiophene) films employing current-sen-sing atomic force microscopy and reflectance spectroscopy. J. Phys. Chem. B, 108,16365 (2004). 

AFM, atomic force microscopy DMA, dynamic mechanical analysis DSC, differential scanning calorimetry flVR, oxidized natural rubber FTIR, Fourier transform infrared spectroscopy NR, natural rubber PLA, poly(lactic acid) QP, quaternary phosphonium salt TGA, thermogravimetric anal is TPU, thermoplastic polyurethane XPCL, end-carboxylated teledielic... 

Abstract Aqueous biocompatible tribosystems are desirable for a variety of tissue-contacting medical devices. L-3,4-dihydroxyphenylalanine (DOPA) and lysine (K) peptide mimics of mussel adhesive proteins strongly interact with surfaces and may be useful for surface attachment of lubricating polymers in tribosystems. Here, we describe a significant improvement in lubrication properties of poly (dimethylsiloxane) (PDMS) surfaces when modified with PEG-DOPA-K. Surfaces were characterized by optical and atomic force microscopy, contact angle, PM-IRRAS, and X-ray photoelectron spectroscopy. Sudi surfaces, tested over the course of 200 rotations ( 8 m in length), maintained an extremely low friction coefficient (p) (0.03 0.00) compared to bare PDMS (0.98 0.02). These results indicate... 

Stepanek M, Humpolickova J, Prochazka K, Hof M, Tuzar Z, Spirkova M, Wolff T (2003) Light scattering, atomic force microscopy and fluorescence correlation spectroscopy studies of polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) micelles. Collect Czech Chem Commun 68(11) 2120-2138. doi 10.1135/cccc20032120... 

Marcott C, Lo M, Kjoller K, Prater C, Noda I. Spatial differentiation of sub-micrometer domains in a poly(hydroxyalkanoate) copolymer using instrumentation that combines atomic force microscopy (AFM) and infrared (IR) spectroscopy. Appl Spectr 2011 65 1145. 

Chen C, Wang J, Woodcock SE, Chen Z. Surface morphology and molecular chemical structure of poly(n-butyl methacrylate)/polystyrene blend studied by atomic force microscopy (AFM) and sum frequency generation (SFG) vibrational spectroscopy. Langmuir 2002 18 1302-9. 

The amount of phospholipids adsorbed from plasma on the MPC polymers increased with increasing amounts of MPC. In the case of hydrophobic poly( -butyl methacrylate (BMA)) and hydrophilic poly(2-hydroxyethyl methacrylate (HEMA)), the amount of adsorbed phospholipids was the same level (about 0.5 pg/cm ). This means that the MPC moiety in the poly(MPC-co-BMA) played an important role to increase adsorption. To clarify the state of phospholipids adsorbed on the polymer surface, the phospholipid liposomal suspension was put in contact with these polymers. Phospholipids were adsorbed on every polymer surface, however, the adsorption state of the phospholipids was different on each polymer. On the surface of the MPC polymer, the adsorbed phospholipids maintained a liposomal structure, like a biomembrane this was confirmed by a differential scanning calorimetry. X-ray photoelectron spectroscopy (XPS), quarts crystal microbalance, and atomic force microscope. The phospholipids adsorbed on the poly(BMA) and poly(HEMA) did have any organized form. It was concluded that the MPC polymers stabilized the adsorption layer of phospholipids on the surface. Small amounts of plasma proteins were adsorbed on the MPC polymer surface pretreated with phospholipid... 

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