Poly composite films

Because of the aqueous solubiUty of polyelectrolyte precursor polymers, another method of polymer blend formation is possible. The precursor polymer is co-dissolved with a water-soluble matrix polymer, and films of the blend are cast. With heating, the fully conjugated conducting polymer is generated to form the composite film. This technique has been used for poly(arylene vinylenes) with a variety of water-soluble matrix polymers, including polyacrjiamide, poly(ethylene oxide), polyvinylpyrroHdinone, methylceUulose, and hydroxypropylceUulose (139—141). These blends generally exhibit phase-separated morphologies. 

SG sols were synthesized by hydrolysis of tetraethyloxysilane in the presence of polyelectrolyte and surfactant. Poly (vinylsulfonic acid) (PVSA) or poly (styrenesulfonic acid) (PSSA) were used as cation exchangers, Tween-20 or Triton X-100 were used as non- ionic surfactants. Obtained sol was dropped onto the surface of glass slide and dried over night. Template extraction from the composite film was performed in water- ethanol medium. The ion-exchange properties of the films were studied spectrophotometrically using adsorption of cationic dye Rhodamine 6G or Fe(Phen) and potentiometrically by sorption of protons. 

Anionic poly(amidoamine) (PAMAM) dendrimer was selected as a model of the soluble acidic-rich proteins to prepare CaC03 film on a poly(ethylenimine) film [49]. The CaCOj/polylethylenimine) composite film was obtained in the... 

Bhandari, S. Deepa, M. Srivastava, A. K. Joshi, A. G. Kant, R., Poly (3, 4-Ethylene-dioxythiophene)- multiwalled carbon nanotube composite films structure-directed amplified electrochromic response and improved redox activity./. Phys. Chem. B2009,113, 9416-9428. 

Liu H, Pan L, Lin Q, Xu N, Lu L, Pang S, Fu S (2010) Preparation and characterization of poly (propylene carbonate)/polystyrene composite films by melt-extrusion method, e-polymers 2010 38, http //www.e-polymers.org/joumal/papers/qlin 270310.pdf. Accessed 01 April 2011... 

SA1391). Poly(3-methoxythiophene-polybithiophene composite film shows an absorption at 510 nm (99PCCP1731). 

Fig. 2.7. Schematic representation of proposed reaction mechanism for oxidation of NADH by poly(aniline)/poly(vinylsulfonate) composite films (the symbols are defined in the text). Note There is no differentiation between the substrate/ site complex formation and the chemical reaction, kcm, that occur at the site.

Catalysis of NADH oxidation Figure 2.15 shows the first cycle response of two different poly(aniline)/ poly(vinylsulfonate) composite films in 0.1 mol dm-3 pH 7 citrate/phos-phate buffer with and without added NADH. 

Johannsmann et al. have reported the use of quartz crystal electrical impedance to study the viscoelastic properties of poly(y-methyl-L-glutama-te-co-y-zi-octadecyl-L-glutamate) thin films [65, 66] and Ward studied the viscoelastic characteristics of poly-styrene films with 2-chloro-toluene solvent by measuring the admittance near resonance at 5 MHz of the unloaded quartz resonator and the composite resonator [67]. 

Yimg-Chein luo et al. prepared amperometrie ammonium ion sensor based on PANi-poly(styrene sulfonate-co-maleic acid) composite eondueting polymeric electrode. Two kinds of PANi- PSSMA composite films were prepared and their ammonium ion-sensing were studied. PANi- PSSMA(I) was prepared by ineorporating PSSMA anions into a... 

Systems that employed HREELS for interfacial-composition determinations included poly(ethylene oxide)-polystyrene diblock copolymer on Si wafers formaldehyde poly(oxymethylene) films on Cu(lOO) and Lang-muir-Blodgett films of 4,4 -oxydianiline-pyromellitic dianhydride polyimide on Au and on highly ordered pyrolytic graphite. ... 

In SRGs inscribed on LC polymer films, time evolution has also been reported in reference 13. TTie depth of the SRG was seen to increase from 70 nm up to 300 nm, 16 h after the writing process was completed. During this period, the samples were left to rest under dark conditions. Ozaki et also showed that the SRG formation processes even after terminating the laser light irradiation on a composite film of an azopolymer and a conducting polymer derived from poly(p-phenylene vinylene). 

Two types of composite films on the basis of ji-conjugated polymers, poly-(V-epo> propyl)carbazole (PEPC) and poly-(V-vinyl)carbazoIe (PVC), and metal nanoparticles have been fabricated. The sizes of nanoparticles depend on type of the polymer matrix. Complex testing of the obtained materials has shovwi that conductivity and optical effects are more evident in the case of PEPC films. 

Leach, A. M. Potyrailo, R. A., Gas sensor materials based on semiconductor nanocrystal/poly-mer composite films, In Combinatorial Methods and Informatics in Materials Science. MRS Symposium Proceedings, Wang, Q. Potyrailo, R. A. Fasolka, M. Chikyow, T. Schubert, U. S. Korkin, A. Eds. Materials Research Society Warrendale, PA, 2006 Vol. 894 237-243... 

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