scholarly journals Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020 ◽  
Vol 137 (3) ◽  
pp. 317-323 ◽  
Author(s):  
R. Ahmed ◽  
A. Ibrahim ◽  
E. El-Said
Keyword(s):  
Optical Properties ◽  
Polyethylene Glycol ◽  
Polyvinyl Alcohol

Electrospun Polyethylene Glycol/Polyvinyl Alcohol Composite Nanofibrous Membranes as Shape-Stabilized Solid–Solid Phase Change Materials

2020 ◽  
Vol 2 (3) ◽  
pp. 167-177 ◽  
Author(s):  
Junwen Huang ◽  
Houyong Yu ◽  
Somia Yassin Hussain Abdalkarim ◽  
Jaromir Marek ◽  
Jiri Militky ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Polyvinyl Alcohol ◽  
Phase Change ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Nanofibrous Membranes

scholarly journals The Influence of Surfactant (SDS) on the Adsorption Properties of Polyvinyl Alcohol and Polyethylene Glycol in an Alumina/Solution System

2002 ◽  
Vol 20 (6) ◽  
pp. 573-582 ◽  
Author(s):  
S. Chibowski ◽  
M. Paszkiewicz ◽  
M. Wiśniewska
Keyword(s):  
Polyethylene Glycol ◽  
Polyvinyl Alcohol ◽  
Adsorption Layer ◽  
Sodium Dodecyl ◽  
Adsorption Properties ◽  
Degree Of Hydrolysis ◽  
Ionic Polymers ◽  
Solution System ◽  
Molecular Weights ◽  
Polymer Surfactant

The influence of sodium dodecyl sulphate (SDS) on the adsorption properties of non-ionic polymers, i.e. polyethylene glycol (PEG) and polyvinyl alcohol (PVA), at the Al2O3/solution interface was studied. Measurements for various molecular weights and for various amounts of functional groups on the polymer macromolecules were undertaken and the results obtained discussed in the light of these variations. Studies of the mutual interactions of the polymer–surfactant system in aqueous solution were helpful in explaining the equilibria involved in the Al2O3/polymer solution system in the presence of SDS. The thickness of the adsorption layer was determined by viscometric methods and the influence of the degree of hydrolysis of PVA on the structure of the adsorption layer demonstrated.

Study the Effect of Heat Treatment and Pressure on some the Optical Properties of the Pure PVA Nano Polymer

2021 ◽  
Vol 900 ◽  
pp. 16-25
Author(s):  
Tabarak Mohammed Awad ◽  
May A.S. Mohammed
Keyword(s):  
Heat Treatment ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Polyvinyl Alcohol ◽  
Complex Dielectric Constant ◽  
Different Temperatures ◽  
German Origin ◽  
Increasing Temperature

In this study, some optical properties were studied of the pure vinyl polyvinyl alcohol (PVA) nanopolymer (German origin). Under the influence of different temperatures and pressures of PVA. Where 25 samples were prepared for the purpose of conducting the research. Which studied the study of these samples was done by recording the absorbance and transmittance spectra of the wavelengths (200-900) nm. From them, absorbance, transmittance, reflectivity, absorption coefficient, refractive index, extinction coefficient, complex dielectric constant were calculated. At different temperatures (25,40, 80, 120, 160)°C. And with different pressures within the range (7.5,8,8.5,9,9.5) MPa. The results are that the permeability of the polymer (PVA) at different temperatures for each pressure decreases with increasing temperature, and that all other calculated optical properties increase with increasing temperature.

scholarly journals Optimized Soft Lithography Method for Polymer Cholesteric Liquid Crystal Flakes Fabrication

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 441 ◽  
Author(s):  
Guanqing Zhou ◽  
Sunqian Liu ◽  
Wei Liu ◽  
Dong Yuan ◽  
Guofu Zhou
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Polyvinyl Alcohol ◽  
Soft Lithography ◽  
Cholesteric Liquid Crystal ◽  
Release Time ◽  
Pdms Mold ◽  
Speed Up ◽  
Liquid Crystal Flakes

Polymer cholesteric liquid crystal (PCLC) flakes are gaining increasing interest for a wide variety of applications because of their unique optical properties and capabilities. Soft lithography is the most effective way to fabricate regularly shaped PCLC flakes. However, it is not easy to peel the flakes from the mold without breaking them. In order to peel the PCLC flakes from the patterned polydimethylsiloxane (PDMS) mold in a convenient way, in this paper, a method of coating a layer of polyvinyl alcohol (PVA) on a PDMS mold was proposed. The influence of the thickness of the PVA layer on the shape of the PCLC flakes and the release time from the PDMS mold were investigated. The results show that the presence of the PVA layer can speed up the release of the PCLC flakes and help maintain the shape effectively. Notably, the utilization of a PVA layer makes the PDMS mold recyclable. The influence of PCLC flake shape was also studied. This work will promote the development of switchable PCLC flake-based technologies.

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