Poly -induced changes

Efremova NV, Sheth SR, Leckband DE (2001) Protein-induced changes in poly(ethylene glycol) brushes molecular weight and temperature dependence. Langmuir 17 7628-7636... 

Figure 2. Effect of polymer concentration on Cu(II)-induced changes in rotation of single-stranded poly(A) and poly(C) at pH 6 in 0.1M NaClOji and 0.01 M caco-dylate. 6r is fractional change in rotation = [a] — [aj/ [a](j — [a]0 where [a] = rotation at given Cu2+ activity, [aj = rotation in the absence of Cu2+, and [ad] = rotation of fully disordered structure. A poly(A), B poly(C). Concentrations (A) 5 X I0"4M 5 X 10 5M (Oj5 X...

Figure 4. Effect of chain length on Cu(II)-induced changes in rotation for single-stranded poly(A) and oligo(A) in water at 25°. Presented as % change in mean residue rotation at trough (see...

The DOUS (density of the valence states) obtained from the calculations was in good agreement with the direct measurements by UPS spectra. By studying temperature-induced changes in the UPS spectra, it can be deduced that the torsion angles of the POPT backbone decrease at elevated temperatures, leading to an increase of crystallinity. This conversion process was found to be irreversible, in contrast to the real thermochromism in poly(3-hexylthio-phene), which is reversible. 

Kataoka K, Miyazaki H, Okano T, and Sakurai Y. Sensitive glucose-induced change of the lower critical solution temperature of poly[N, N-dimethylacrylamide-co-3-acrylamido[phenylhoronic acid] in physiological saline. Macromolecules 1994 27 1061-1062. 

For = 676.4 nm, it is difficult to register the spectra of neutral poly(3-octylthiophene) due to strong fluorescence which obscures the Raman lines. However, the fluorescence disappears totally with the onset of doping (Figure 4.22). Thus, at potentials above 400 mV, clear spectra can be observed. The doping induced changes can be briefly outlined as follows ... 

Polyaniline and its substituted derivatives, such as poly(o-toluidine), poly(o-anisidine), poly(N-methylaniline), poly(N-ethylaniline), poly(2,3-dimethylaniline), poly(2,5-dimethylaniline) and poly (diphenylamine) have been reported [36] to show measurable responses (sensitivity 60%) for short chain alcohols (viz., methanol, ethanol and propanol) at concentrations up to 3000 ppm. The change (decrease) in resistance of the polymers on exposure to alcohol vapors has been explained based on the vapor-induced change in the crystallinity of the polymer. Polypyrrole (PPy) incorporated with dodecyl benzene sulfonic acid and ammonium persulfate has been reported to show a linear change in resistance when exposed to methanol vapor in the range 87-5000 ppm [37]. The response is rapid and reversible at room temperature. 

Although the property of interest in all of the above-mentioned cyano-OPV-containing materials was a mechanically induced change of the photoluminescence color (i.e., a mechanically induced transformation from an excimer-rich to a monomer-dominated emission), certain cyano-OPVs also display a changed of their absorption color upon (dis)assembly. Thus, Kunzelman et al. reported mechanochromic blend films based on C18-RG and either poly(ethylene... 

SHG Study of Photo-induced Changes in Poly(vinyl) Cinnamate (PVCN)... 

Doping-induced change of carrier mobilities In poly[3-hexyithiophene] films with different stacking structures. Reprinted with permission from Ref. 85. Copyright 2002 Elsevier Science B.V. 

In (3.4.22), the solvation volume is viewed as consisting of two terms an average Voronoi polyhedron of the solute and a change in the volume of the solvent due to solute induced changes in the distribution of the volumes of the Voronoi poly-hedra of the solvent molecules. 

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