Infrared-visible sum frequency generation spectroscopy (SFG) has been used to study the interface between poly(vinyl-N-octadecylcarbamate-co-vinyl acetate) (Comb) and deuterated or hydrogenated polystyrene (dPS or hPS) films. Strong methyl symmetric and Fermi resonance bands associated with the alkyl side chains of the Comb polymer are observed in the SFG spectra. In addition, for Comb/hPS spec...

fluid properties with constant improvement in efficiency have been noticeable as important criteria in drilling operation. the main drilling fluid properties highly depend on utilization of new polymers with high efficiency in drilling fluid composition. in this paper, the performance of a new polymer, called partially hydrolyzed polyacrylamide polymer (phpa), is studied which has recently ente...

in this paper, absorption spectra of both solution and films of cyano azobenzene polymer are investigated. the analysis of overlapped absorption spectra of polymer, related to trans and cis isomers, shows that the population of cis isomers is higher than trans isomers. it means that, cyano azobenzene molecules have a folded structure in polymer, in thermal equilibrium. presence of cyano molecul...

This study describes thermo-rheological properties of branched copolymer surfactants (BCSs) stabilizing oil-in-water emulsions to generate materials exhibiting temperature-dependent gelation with the ability solubilize a broad range molecules. Four poly(N-isopropylacrylamide-ran-poly(ethylene glycol) methacrylate) (poly(NIPAM-ran-PEGMA)) BCSs varying molecular weight (Mn), 4.7; 7.0; 7.8 and 9.0...

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this paper discusses about preparation of biodegradable polymer /clay nanocomposites based on organically modified montmorillonite clay; i.e. cloisite 10a and biodegradable polymer chitosan by solution mixing technique and their characterization. the nanocomposites were successfully prepared and their structures were characterized by powder x-ray diffraction (xrd), particle size analyzer (beckm...

Abstracf The successful development of multicomponent polymer systems generally requires careful control of polymer-polymer interactions since this is important for achieving useful mechanical properties, optically clear mixtures (miscibility), coupling of impact modifiers to a bnttle matrix, compatibilization of immiscible polymers, etc. Random copolymers offer a powerful tool for achieving th...