The Influence of Bio Natural Dye on the Optical Properties of Liquid Polyvinyl Alcohol

2021 ◽  
pp. 41-47
Author(s):  
Salih Abbas Habeeb ◽  
Nardin Adnan Birtio ◽  
Hanaa Jawad Kadhim
Keyword(s):  
Optical Properties ◽  
Polyvinyl Alcohol ◽  
Natural Dye

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.

Effect of concentration on optical properties of dyes incorporated into polyvinyl alcohol films

1986 ◽  
Vol 36 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Vladimir Z. Paschenko ◽  
Andrew N. Ponomaryev ◽  
Victor I. Yuzhakov
Keyword(s):  
Optical Properties ◽  
Polyvinyl Alcohol ◽  
Polyvinyl Alcohol Films

scholarly journals Synthesis, characterization and study of optical properties of polyvinyl alcohol/ CaF2 nanocomposite films

2012 ◽  
Vol 19 (6) ◽  
pp. 1979-1983 ◽  
Author(s):  
O. Nakhaei ◽  
N. Shahtahmassebi ◽  
M. Rezaeeroknabadi ◽  
M.M. Bagheri Mohagheghi
Keyword(s):  
Optical Properties ◽  
Polyvinyl Alcohol ◽  
Nanocomposite Films

Phytochemical screening and potential of natural dye colourant from pomegranate (Punica granatum L.)

2016 ◽  
Vol 45 (1) ◽  
pp. 38-44 ◽  
Author(s):  
S. Mohajer ◽  
R.M. Taha ◽  
S.Z. Azmi
Keyword(s):  
Polyvinyl Alcohol ◽  
Antioxidant Activities ◽  
Punica Granatum ◽  
Natural Dye ◽  
Coating System ◽  
Content Type ◽  
Ic50 Values ◽  
The Stability

Purpose – The purpose of this paper is to identify the most dominant pigment of pomegranate explants for natural color coatings and detect the presence of phytochemical constituents and comparison of the antioxidant activities. Design/methodology/approach – Extracts of leaf, stem, peel and seed of in vitro and in vivo growth cultures were prepared for phytochemical constituent and antioxidant activity. The supernatant from 95 per cent methanol was mixed with 15 per cent polyvinyl alcohol (PVA) with the ratio of 1:1 to form a coating system. Findings – Although glycosides was not found in this species, tests for tannins and flavonoids were positive in all samples. The IC50 values were also comparable to commercial antioxidant ascorbic acid with 34.92 per cent inhibition. Chlorophyll a and b were detected in stem and leaf using UV-photospectrometer in 420 and 645 nm wavelengths ranges. The effects of heat and salt on the stability of natural dye colorants mixed with polyvinyl alcohol to form a basic coating system were indicated negatively in in vivo and in vitro growth cultures. Originality/value – The paper shows that further improvement with co-pigmentations may give a notable mixture from pomegranate extraction for the paint materials or nail varnish. It was also indicated that pomegranate contains some compounds such as polyphenolics that can donate electron/hydrogen easily.

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