Charge transfer phenomenon in optical storage material: Fe 3+ -doped poly(vinyl alcohol)

The effects of UV irradiation on iron(III)chloride doped poly(vinyl alcohol) (PVA) films, using a high molar mass polymer, have been studied. It has been found that the polymer is oxidized and crosslinked during UV irradiation. UV/VIS spectra reveal an exponential loss of absorption at λ = 360 nm, and the refractive index of the PVA:FeCl3 films decreases significantly during UV irradiation (ΔnD = −0.09). The effects of crosslinking have been studied using the sol–gel technique, which revealed high gel contents due to doping and UV‐exposure. Photolithographic patterning of doped PVA films using a medium‐pressure mercury‐vapor UV source has been carried out, leading to good contrast behavior before and after development in aqueous media. A photobleaching effect was observed, therefore the curing of thicker films is feasible. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“… Reaction mechanisms for the crosslinking of PVA/FeCl 3 according to Manivannan3 (a) and Kowalonek 14. (b).…”

Section: Introductionmentioning

confidence: 99%

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UV crosslinking of Fe³⁺‐doped poly(vinyl alcohol)—Characterization of optical properties and swelling behavior

Rieß

Kern

2013

“…Fe(III)‐doped PVA(Fe(III)‐PVA) photopolymer resin is a water soluble, environmentally friendly and UV‐curable polymer system, which does not involve toxic and harmful chemicals in the preparation and processing. Fe(III)‐PVA could be used for determining the diffraction efficiency, optical data processing technologies, real‐time holographic recording medium, electrodes for batteries and capacitors, and high‐temperature coatings. Fe(III)‐PVA is also a potential material for preparing flexographic‐printing plates .…”

Section: Introductionmentioning

confidence: 99%

Effect of nano silicon dioxide on the structure and properties of FeCl₃‐doped polyvinyl alcohol photopolymer film

Xue

Mao

Zhang

et al. 2019

The polyvinyl alcohol (PVA) photopolymer films (PFs) were prepared based on iron(III) trichloride as the photosensitizer and PVA as the polymer matrix (Fe(III)-PVA). The nano silicon dioxide (nano-SiO 2 ) was mixed with the resin in proportions of 0.5, 1.0, 2.0, and 5.0 wt %, respectively. The iodine gallium lamp (350-450 nm) was used as a UV curing light source. The effects of nano-SiO 2 on the structures and properties of Fe(III)-PVA PFs were studied by scanning electron microscopy(SEM) analysis, ultraviolet-visible absorption spectroscopy (UV/Vis), X-ray diffraction (XRD), dynamic thermomechanical analysis(DMA), gel content test, tensile strength test, and Shore hardness test. The Fe(III)-PVA PFs with the content of 1.0 wt %-nano-SiO 2 exhibits the highest gel content and tensile strength. The Fe(III)-PVA PFs with the content of 2.0 wt % nano-SiO 2 exhibits the highest Shore hardness. Photolithographic patterning of the Fe(III)-PVA PFs using a UV source has been carried out, which leads to a good contrast behavior after development in an aqueous media when the content of nano-SiO 2 was lower than 2.0 wt %. After evaluating the structure, performance, and development results, the Fe(III)-PVA PFs with the content of 1.0 wt % nano-SiO 2 exhibits the best overall properties.

Preparation of UV reactive montmorillonite and characterization of its nanocomposites with poly(vinyl alcohol)

Rieß¹,

Gisbert²,

Kern³

2013

A cation‐exchanged montmorillonite clay is prepared as filler material with high dispersibility, that should act as Fe3+‐donor for photochemical crosslinking of PVA/Fe3+‐MMT materials with filler contents of up to 50 wt % with regard to the polymer matrix. Hence, no organic photoinitiators and hazardous compounds are utilized. This material may be considered environmentally benign and could be applied in the field of food packaging or for biomedical applications. Upon UV exposure of liquid PVA/Fe3+‐MMT dispersion samples, a significant change of the refractive index is determined and the absorption at 360 nm decreased. This indicates the transition of Fe3+ to Fe2+, which initiates a radical crosslinking mechanism. A homogenous distribution and parallel orientation of the modified clay particles is revealed by SEM measurements. The solubility behavior of the PVA/Fe3+‐MMT composite materials in deionized water, changes considerably due to the high filler content and UV‐induced crosslinking, resulting in gel contents exceeding 90 wt %. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013