Effect of Temperature and Solvent Composition on the Intrinsic Viscosity of Poly(vinyl pyrrolidone) in Water−Ethanol Solutions

2010 ◽  
Vol 55 (9) ◽  
pp. 3720-3724 ◽  
Author(s):  
Abbas Mehrdad ◽  
Reza Akbarzadeh
Keyword(s):  
Intrinsic Viscosity ◽  
Solvent Composition ◽  
Vinyl Pyrrolidone ◽  
Effect Of Temperature ◽  
Poly Vinyl Pyrrolidone

THE EFFECT OF TEMPERATURE AND MIXED-SOLVENT COMPOSITION ON THE INTRINSIC VISCOSITY OF GR–S

1948 ◽  
Vol 26b (2) ◽  
pp. 230-247 ◽  
Author(s):  
L. H. Cragg ◽  
T. M. Rogers
Keyword(s):  
Intrinsic Viscosity ◽  
Strong Evidence ◽  
Mixed Solvent ◽  
Solvent Composition ◽  
Temperature Measurements ◽  
Effect Of Temperature ◽  
Chain Molecule ◽  
First Approximation ◽  
Long Chain

The intrinsic viscosity of a sample of GR–S has been measured, at temperatures ranging from 0° to 65 °C., in several solvents made progressively 'poorer' (to the point of precipitation) by the addition of nonsolvent. The results afford strong evidence in support of the theory (Flory; Alfrey, Bartovics, and Mark) that intrinsic viscosity is very sensitive to the shape assumed by a flexible long-chain molecule in solution and that this shape varies with the nature of the solvent and with the temperature. Measurements with various systems of the type GR–S–solvent–nonsolvent indicate that the intrinsic viscosity at the precipitation point is the same with different nonsolvents and, to a first approximation, with different solvents. This intrinsic viscosity is, moreover, independent of temperature.

scholarly journals Effect of temperature on the morphology of bubble-electrospun nanofibers

2014 ◽  
Vol 18 (5) ◽  
pp. 1707-1709 ◽  
Author(s):  
Qiu-Na Cui ◽  
Ya Li ◽  
Fu-Juan Liu
Keyword(s):  
Vinyl Alcohol ◽  
Smooth Surface ◽  
Electrospun Nanofibers ◽  
Vinyl Pyrrolidone ◽  
Effect Of Temperature ◽  
Poly Vinyl Alcohol ◽  
Temperature Environment ◽  
Poly Vinyl Pyrrolidone

The morphology and microstructures of poly(vinyl alcohol) and poly(vinyl pyrrolidone) nanofibers produced by bubble-electrospinning are investigated experimentally. It is shown that the temperature predominantly affect the average diameters of the formed nanofibers. The smooth surface and controllable diameters of nanofibers are essential for their applications in different temperature environment.

Effect of temperature and moisture on the miscibility of amorphous dispersions of felodipine and poly(vinyl pyrrolidone)

2010 ◽  
Vol 99 (1) ◽  
pp. 169-185 ◽  
Author(s):  
Patrick J. Marsac ◽  
Alfred C.F. Rumondor ◽  
David E. Nivens ◽  
Umesh S. Kestur ◽  
Lia Stanciu ◽  
...  
Keyword(s):  
Vinyl Pyrrolidone ◽  
Effect Of Temperature ◽  
Amorphous Dispersions ◽  
Poly Vinyl Pyrrolidone

scholarly journals ALD coating of centrifugally spun polymeric fibers and postannealing: case study for nanotubular TiO2 photocatalyst

2021 ◽  
Author(s):  
Martina Rihova ◽  
Oksana Yurkevich ◽  
Martin Motola ◽  
Ludek Hromadko ◽  
Zdeněk Spotz ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Vinyl Pyrrolidone ◽  
Tio2 Photocatalyst ◽  
Polymeric Fibers ◽  
Layer Deposition ◽  
Centrifugal Spinning ◽  
Poly Vinyl Pyrrolidone

This work describes the synthesis of highly photocatalytically active TiO2 tubes (TiTBs) by combining centrifugal spinning and atomic layer deposition (ALD). Poly(vinyl pyrrolidone) (PVP) fibers were first produced by centrifugal...

scholarly journals Potential Implantable Nanofibrous Biomaterials Combined with Stem Cells for Subchondral Bone Regeneration

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3087
Author(s):  
Rana Smaida ◽  
Luc Pijnenburg ◽  
Silvia Irusta ◽  
Erico Himawan ◽  
Gracia Mendoza ◽  
...  
Keyword(s):  
Stem Cells ◽  
Bone Regeneration ◽  
Subchondral Bone ◽  
Therapeutic Potential ◽  
Sodium Hyaluronate ◽  
Vinyl Pyrrolidone ◽  
Regenerative Ability ◽  
Poly Vinyl Pyrrolidone

The treatment of osteochondral defects remains a challenge. Four scaffolds were produced using Food and Drug Administration (FDA)-approved polymers to investigate their therapeutic potential for the regeneration of the osteochondral unit. Polycaprolactone (PCL) and poly(vinyl-pyrrolidone) (PVP) scaffolds were made by electrohydrodynamic techniques. Hydroxyapatite (HAp) and/or sodium hyaluronate (HA) can be then loaded to PCL nanofibers and/or PVP particles. The purpose of adding hydroxyapatite and sodium hyaluronate into PCL/PVP scaffolds is to increase the regenerative ability for subchondral bone and joint cartilage, respectively. Human bone marrow-derived mesenchymal stem cells (hBM-MSCs) were seeded on these biomaterials. The biocompatibility of these biomaterials in vitro and in vivo, as well as their potential to support MSC differentiation under specific chondrogenic or osteogenic conditions, were evaluated. We show here that hBM-MSCs could proliferate and differentiate both in vitro and in vivo on these biomaterials. In addition, the PCL-HAp could effectively increase the mineralization and induce the differentiation of MSCs into osteoblasts in an osteogenic condition. These results indicate that PCL-HAp biomaterials combined with MSCs could be a beneficial candidate for subchondral bone regeneration.

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