Thermal Dehydration of a Poly(vinyl alcohol) Film Promoted by Diphenyliodonium Trifluoromethanesulfonate: Absorption Spectra and Elemental Analysis Results

2004 ◽  
Vol 77 (3) ◽  
pp. 591-595 ◽  
Author(s):  
Yukio Yamamoto ◽  
Seiichi Tagawa
Keyword(s):  
Absorption Spectra ◽  
Elemental Analysis ◽  
Vinyl Alcohol ◽  
Thermal Dehydration ◽  
Poly Vinyl Alcohol

Absorption spectra of CR3+ in poly(vinyl alcohol)

1991 ◽  
Vol 31 (3) ◽  
pp. 347-351 ◽  
Author(s):  
A.M. Hashad ◽  
A. Abdel Razik ◽  
Afkar K. Abdel Hadi
Keyword(s):  
Absorption Spectra ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

scholarly journals Studying of the optical properties of poly (vinyl alcohol) films using Aluminum sulphate as additive by measuring allowed direct transition energy gap

2011 ◽  
Vol 8 (1) ◽  
pp. 103-109
Author(s):  
Baghdad Science Journal
Keyword(s):  
Activation Energy ◽  
Band Gap ◽  
Absorption Spectra ◽  
Vinyl Alcohol ◽  
Optical Band Gap ◽  
Energy Gap ◽  
Poly Vinyl Alcohol ◽  
Direct Transition ◽  
Aluminum Sulphate ◽  
Optical Activation

The change in the optical band gap and optical activation energy have been investigated for pure Poly (vinyl alcohol)and Poly (vinyl alcohol) doped with Aluminum sulphate to proper films from their optical absorption spectra. The absorption spectra were measured in the wave range from (200-700) nm at temperature range (25-140) 0C. The optical band gap (Eg) for allowed direct transition decrease with increase the concentration of Aluminum sulphate. The optical activation energy for allowed direct transition band gap was evaluated using Urbach- edges method. It was found that ?E increases with increasing the concentration of Al2 (SO4)3 and decreases when temperature increases.

Study on Chemical Vapour Sensing Property of Esterified Poly(vinyl Alcohol)

2010 ◽  
Vol 93-94 ◽  
pp. 185-189 ◽  
Author(s):  
S. Sangngern ◽  
Somboon Sahasitthiwat ◽  
N. Koonsaeng ◽  
A. Laobuthee
Keyword(s):  
Thin Films ◽  
Carbon Black ◽  
Ethyl Acetate ◽  
Elemental Analysis ◽  
Chemical Sensors ◽  
Spin Coating ◽  
Vinyl Alcohol ◽  
Chemical Vapour ◽  
Poly Vinyl Alcohol ◽  
Degree Of Esterification

Modification of poly(vinyl alcohol) (PVA) by esterification is one of alternative ways to prepare copolymers. The degree of esterification on PVA was determined by FTIR, 1H-NMR, and elemental analysis. Both polymers, i.e., PVA and esterified PVA were mixed with carbon black in DMSO and prepared as thin films onto the interdigited electrodes (IDE) by spin-coating technique to obtain chemical sensors. To investigate the chemical vapour sensing property, the chemical sensors were examined with various organic solvents such as hexane, toluene, alcohols, THF, ethyl acetate, etc.

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