Thermally stimulated depolarization current (TSDC) characteristics of Polyvinyl Pyrrolidone (PVP) electrets are studies in the temperature range 30 to 210 C as functions of the polarizing field (5 to 100kV/cm) and polarizing temperature (40 to 80C). The TSDC spectra comprise two maxima, namely, β and α with their respective locations around 90 C and 172.5 C. These are attributed to dipoleorient...

This work explores the electrospinnability of low-sulfonate Kraft lignin (LSL)/polyvinylpyrrolidone (PVP) solutions in N,N-dimethylformamide (DMF) and ability different micro- nano-architectures generated to structure castor oil. LSL/PVP were prepared at concentrations (8–15 wt%) LSL:PVP ratios (90:10–0:100) physico-chemically rheologically characterized. The morphology electrospun nanostructur...

We contrast the adsorption, over a wide range of pH and ionic strength, of polyelectrolyte chains with different fractions of charged segments but similar degree of polymerization. The system was a cationic polymer, poly~1,4 vinyl!pyridine ~PVP!, with 14%, 48%, and 98% quaternized repeat units, adsorbed from aqueous solution ~D2O or H2O! onto a single silicon oxide substrate at 25 °C. Measureme...

The warming exothermic peaks (WEX) first described by Luyet and coworkers in solutions of ethylene glycol, glycerol, and polyvinylpyrrolidone(PVP) was interpreted on the basis of a devitrification phenomenon, in which rapid cooling converts normal water to amorphous ice, which devitrifies on warming to the state of normal Ice I. Our present studies of the WEX phenomenon in aqueous solutions of ...

Percutaneous vertebroplasty (PVP) has been used to relieve pain and to prevent further collapse of the vertebral body in patients with an osteoporotic compression fracture. The most commonly affected site for the use of PVP is the thoracolumbar junction. There are few reports that have described on the usefulness of PVP in the treatment of a high thoracic compression fracture. We report a case ...

Type 2 antigens such as polyvinylpyrrolidone (PVP), 1 type III pneumococcal polysaccharide ($3), and dinitrophenyl (DNP)-ficoll characteristically elicit antibody responses in mice that consist almost entirely of antibodies of the IgM and IgG3 isotypes (1-4). Type 2 antigens also are generally unable to prime mice to produce I gG 1 and IgG2 antibodies after secondary challenge, i.e. they are un...

Objective: To compare the efficacies of percutaneous vertebral angioplasty (PVP), percutaneous kyphoplasty (PKP) and conventional open operation in the treatment of spinal tumor. Methods: Forty-seven patients who admitted to our hospital were divided into three groups: PVP group (treated with PVP), PKP group (treated with PKP) and control group (treated with conventional open operation). Visual...

Herein, we report the development of a fluorescent material with temperature memory properties. Unlike previously developed systems which can only on single triggering point, conjugated polyelectrolyte-based sensor detects its exposure to wide range temperatures. To achieve this unique property, large poly(phenyl ethylene) (PPE-CO2) polyelectrolytes are destabilized and locked in more emissive ...