Effect of the molecular weights on the optical and mechanical properties of poly(vinyl alcohol) films

El-Kader, K.A.M Abd; Hamied, S. F. Abdel; Mansour, Ahmed Bakry; Ellawindy, Alia; El-Tantaway, F

doi:10.1016/s0142-9418(02)00020-x

Cited by 47 publications

(20 citation statements)

References 10 publications

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“…It is a well-known, water-soluble polymer which is widely used as paper coating agents, adhesives, and films. Recently, PVA has been used in adhesives manufactured of automotive safety glass in textile size and finishes in paper sizes and coating, as binder for ceramics, foundry cases, nonwoven fabric and various pigment [1][2][3][4][5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

γ-Irradiation Effect on the Non-Cross-Linked and Cross-Linked Polyvinyl Alcohol Films

El‐Sawy

El‐Arnaouty

Ghaffar

2010

Polymer-Plastics Technology and Engineering

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The non-cross-linked and cross-linked polyvinyl alcohol (PVA) films were prepared by the casting method then irradiated with gamma rays for various doses up to 300 kGy. The structure and characterization of PVA were determined by using Infrared spectroscopy (FTIR), ultraviolet spectroscopy (UV) and X-ray diffraction (XRD). Swelling behaviour was also investigated. Mechanical properties have been examined with respect to the absorbed dose. The color of the films changed to yellowish-white after irradiation and the crystallinity of the films decreased with increasing dose. Additional changes observed by FTIR analysis of the degradation products demonstrated that the radiolysis of PVA was initiated by liberation of H and OH groups leading to scission of the main chains and formation of carbonyl and double bond groups. Thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were performed. The FTIR, UV, XRD and mechanical properties indicate that the addition of cross-linker led to high degrees of interaction between the cross-linker and the macromolecules of polymeric chains and acted as a stabilizing agent against gamma irradiation.

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Section: Introductionmentioning

confidence: 99%

γ-Irradiation Effect on the Non-Cross-Linked and Cross-Linked Polyvinyl Alcohol Films

El‐Sawy

El‐Arnaouty

Ghaffar

2010

Polymer-Plastics Technology and Engineering

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“…The necessity for stable and reliable PVA has greatly increased during recent years. [2][3][4][5] In this connection the study of PVA with additions of different amounts of magnesium sulfate, compounds of which are involved in many uses, is very important, particularly with respect to a knowledge of any changes in its electrical properties. A research program on the growth and electrical properties of pure PVA and PVA to which impurities have been added is being carried out in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

Electric studies on polyvinyl alcohol with additions of magnesium sulfate

Mansour

2004

J of Applied Polymer Sci

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Polyvinyl alcohol (PVA; molecular weight 17,000 g/mol) with additions of several different amounts of magnesium sulfate (molecular weight 246.945 g/mol) was prepared by the casting technique. The dc electric properties of these films were measured in different temperature ranges and the activation energy values as a function of different magnesium sulfate amounts were calculated. The dependency of dc electrical conductivity dc at a certain temperature was found to fit the well-known equation dc ϭ [(1/R) ϫ (t/A)] (⍀ Ϫ1 m Ϫ1 ). The temperature dependency of dc , which suggested an electronic hopping conduction mechanism in a thermally assisted electric field, in addition to some theoretical mechanism were discussed. Also the values of activation energy as a function of different amounts of magnesium sulfate were investigated and it was found that the activation energy values for most samples increase with increased amounts of magnesium sulfate. On the other hand, the nonlinear coefficient parameter as a function of the different amounts of magnesium sulfate was investigated for all the prepared samples.

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“…Observed shoulder intensity varied due to occurrence of isolated carbonyl groups that result in a shift of shoulder position to a higher wavelengths. Such a shifts can be considered as an evidence for complexation and interaction behavior of chitosan with proposed polymeric blend in combination with the observed crystallinity changes attributed to chitosan addition [12]. …”

Section: 2uv-vis Spectroscopymentioning

confidence: 75%

The Theory of The Nuclear Universe and The Secret of The Supernova

GuimarÃ£es¹

2018

JAP

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Structural and optical studies in combination with surface morphology investigations were accomplished for blend sample (70/30)wt% PVA/Starch in addition to other samples of the same composition containing added pre-calculated chitosan contents via ordinary casting route. All synthesized samples were tested using various experimental techniques including Fourier transform infrared FT-IR, UV-visible spectroscopic measurements and scanning electron microscopic (SEM). Variations in FT-IR, UV/vis. band positions and intensities were used as an evidence for the interaction between constituent partner polymeric matrices. The X-ray diffraction (XRD) experimental data reveled that introduction of chitosan into the polymeric matrices results in a decreasing of percent crystallinity through material. SEM micrographs for samples containing chitosan different concentration revealed small granules and bright spots that attributed to starch. Adding up to 80% more chitosan caused the cryo-fractured surface to become rougher and more brittle.

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Effect of the molecular weights on the optical and mechanical properties of poly(vinyl alcohol) films

Cited by 47 publications

References 10 publications

γ-Irradiation Effect on the Non-Cross-Linked and Cross-Linked Polyvinyl Alcohol Films

γ-Irradiation Effect on the Non-Cross-Linked and Cross-Linked Polyvinyl Alcohol Films

Electric studies on polyvinyl alcohol with additions of magnesium sulfate

The Theory of The Nuclear Universe and The Secret of The Supernova

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