Role of specific interactions on fiber formation in the electrospinning of poly(vinyl phenol)/poly(vinyl pyrrolidone) blend solutions

2009 ◽  
Vol 114 (5) ◽  
pp. 2922-2928 ◽  
Author(s):  
L. Buruaga ◽  
M. E. Muñoz ◽  
L. Irusta ◽  
A. González ◽  
J. J. Iruin
Keyword(s):  
Fiber Formation ◽  
Vinyl Pyrrolidone ◽  
Specific Interactions ◽  
Poly Vinyl Pyrrolidone ◽  
Vinyl Phenol

Ultrafine Cellulose Acetate Fibers with Nanoscale Structural Features

2008 ◽  
Vol 8 (9) ◽  
pp. 4461-4469 ◽  
Author(s):  
Lifeng Zhang ◽  
You-Lo Hsieh
Keyword(s):  
Hydrogen Bonding ◽  
Cellulose Acetate ◽  
Pore Volume ◽  
Structural Features ◽  
Fiber Formation ◽  
Vinyl Pyrrolidone ◽  
Chain Entanglement ◽  
Bicomponent Fibers ◽  
Micron Size ◽  
Poly Vinyl Pyrrolidone

Nano-structural features were introduced to ultrafine cellulose acetate (CA) fibers by electrospinning of its mixtures with either poly(vinyl pyrrolidone) PVP or β-cyclodextrin (β-CD) in DMF, followed by dissolution of the added PVP or β-CD. The presence of the charge-holding PVP enabled fiber formation from CA below its entanglement chain length and improved the electrospinning efficiency to produce bicomponent fibers with wide ranging diameters from 30 to 650 nm. At up to 50% contents, the PVP in the bicomponent fibers was phase-separated from CA and, upon removal, resulting in highly angulated fiber surfaces with nanometer-size spherulites and sub-micron size ridges and grooves. Adding β-CD to CA enabled fiber formation at concentrations below the chain entanglement concentration Ce (16.5%). Hydrogen bonding between β-CD and CA, as evident by FTIR, helped to distribute β-CD as individual molecules in the CA matrix and producing more uniform and finer (130–150 nm in diameters) fibers, irrespective of their β-CD contents. Removal of β-CD from the fibers originally containing 40% β-CD, generated nanoporous fibers with 2-nm nanopores and 70% increase in specific surface and doubled pore volume.

A comparative study of dissolving hyaluronic acid microneedles with trehalose and poly(vinyl pyrrolidone) for efficient peptide drug delivery

2018 ◽  
Vol 6 (10) ◽  
pp. 2566-2570 ◽  
Author(s):  
Hong Kee Kim ◽  
Soo Hyeon Lee ◽  
Boo Yong Lee ◽  
Sung Jin Kim ◽  
Chang Yub Sung ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Hyaluronic Acid ◽  
Comparative Study ◽  
Vinyl Pyrrolidone ◽  
Peptide Drug ◽  
Pharmacokinetic Properties ◽  
Poly Vinyl Pyrrolidone

We studied the role of the additives trehalose and poly(vinyl pyrrolidone) in the physical and pharmacokinetic properties of peptide drug incorporated microneedles.

Role of pumice particles in the thermal, electrical and mechanical properties of poly(vinyl alcohol)/poly(vinyl pyrrolidone) composites

2016 ◽  
Vol 126 (2) ◽  
pp. 511-519 ◽  
Author(s):  
Manammel Thankappan Ramesan ◽  
Ankita George ◽  
Panniyamvelli Jayakrishnan ◽  
Gopalannair Kalaprasad
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Vinyl Pyrrolidone ◽  
Poly Vinyl Alcohol ◽  
Poly Vinyl Pyrrolidone

scholarly journals A role of free silanol groups of nanosilica surface in interaction with poly(vinyl pyrrolidone)

2018 ◽  
Vol 72 (2) ◽  
pp. 51 ◽  
Author(s):  
Olga Voronina ◽  
Maria Malysheva ◽  
Liudmyla Nosach ◽  
Eugeny Voronin ◽  
Vladimir Gun’ko ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Crucial Role ◽  
Vinyl Pyrrolidone ◽  
Initial Amount ◽  
Silanol Groups ◽  
Adsorption Monolayer ◽  
Poly Vinyl Pyrrolidone

In this work, a role of the number of free silanol groups at a nanosilica surface (specific surface area S<sub>BET</sub> = 250 m<sup>2</sup>/g, initial amount of silanols α<sub>ОН</sub> = 0.60-0.62 mmol/g) was analyzed in interaction with poly(vinyl pyrrolidone) (PVP) vs. the degree (Q<sub>TMS</sub>) of silica hydrophobization by hexamethyldisilazane at 100 <sup>o</sup>C. The value of Q<sub>TMS</sub> was 0.07, 0.42, 0.67, 0.81, 0.82, and 1.0. Adsorption of PVP onto a nanosilica surface was carried out from a water and water-ethanol (1:1) solutions of the polymer. It was shown that free silanol groups play a crucial role in the adsorption of poly(vinyl pyrrolidone). The value of the maximal adsorption (monolayer capacity) on completely hydrophobic nanosilica surface is approximately by 6.5 times lower than that for unmodified nanosilica

scholarly journals Analysis of electrical measurements oncadmium chloridedoped PVA-PVP blend

2017 ◽  
Vol 16 (1) ◽  
pp. 45-65 ◽  
Author(s):  
Basavarajeshwari M Baraker ◽  
Blaise Lobo
Keyword(s):  
Charge Carriers ◽  
Vinyl Pyrrolidone ◽  
Poly Vinyl Alcohol ◽  
Electrical Measurements ◽  
Temperature Dependent ◽  
Mobility Of Charge Carriers ◽  
Solution Casting Method ◽  
Poly Vinyl Pyrrolidone ◽  
Electrical Data

Films of Poly(vinyl alcohol) (PVA) - Poly(vinyl pyrrolidone) (PVP) blend, doped withcadmium chloride (CdCl2) from 0.5 wt% up to 40 wt% andprepared by solution casting method,were studied using temperature dependent direct current (DC)electrical measurements. The DC electrical data were analyzed using Variable Range Hopping (VRH) modelin the temperature range varying from 303K up to 318K. The Mott parameters are determined. The study of time evolution of current passing through the sample, when a constant voltage is applied across it reveals that ions are the majority charge carriers, but the role of electrons in charge transport cannot be neglected. The activation energy (Ea) for mobility of charge carriers has been calculated from VRHand Arrhenius models.

Enhanced Thermo-Mechanical Properties of Poly(vinyl alcohol)/Poly(vinyl pyrrolidone) Polymer Blended with Nanographene

2020 ◽  
Vol 16 ◽  
Author(s):  
Seenaa Hussein ◽  
Alaa Abd-Elnaiem ◽  
Nadia Ali
Keyword(s):  
Thermal Stability ◽  
Vinyl Alcohol ◽  
Nanocomposite Films ◽  
Vinyl Pyrrolidone ◽  
Poly Vinyl Alcohol ◽  
Good Thermal Stability ◽  
Blend Morphology ◽  
Poly Vinyl Pyrrolidone ◽  
Blend Polymer

Background: The addition of nanofillers to polymers for enhanced performance is delivering more interesting applications for aerospace, aeronautic industries, and other numerous nano-technical applications. Objective: The aim was therefore to examine the role of graphene nanopowder on the thermal stability and conductivity of the poly(vinyl alcohol)/poly(vinyl pyrrolidone) (PVA/PVP) polymer nanocomposites. Methods: In this work, graphene nanofillers were incorporated into the PVA/PVP polymer blended by solution mixing for the preparation of nanocomposite films. Results: Results showed that; increasing graphene ratio improved thermal conductivity up to 330%, moreover enhancing hardness shore A up to 16.3% compared to pure PVA/PVP blend polymer. TGA analysis confirmed that the PVA/PVP and graphene network showed good thermal stability. Conclusion: From the present findings, it is proved that PVA/PVP blends have profound effects on thermal stability that cannot be attained by using individual counterparts. The property of the nanocomposite depends on the host blend, morphology, and interfacial characteristics.

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