Low-temperature UV irradiation induced the color change kinetics and the corresponding structure development of PVC film

2011 ◽  
Vol 122 (4) ◽  
pp. 2588-2593 ◽  
Author(s):  
Chuanbin Yi ◽  
Yanhong Sun ◽  
Hong Pi ◽  
Shaoyun Guo
Keyword(s):  
Low Temperature ◽  
Uv Irradiation ◽  
Color Change ◽  
Structure Development ◽  
Pvc Film

Synthesis, characterization, and application of polyanisidines as efficient photostabilizers for poly(vinyl chloride) films

2019 ◽  
Vol 52 (6) ◽  
pp. 537-547
Author(s):  
Magdy W. Sabaa ◽  
Mohamed A Sanad ◽  
Mahmoud A Abd El-Ghaffar ◽  
Nourelhoda A Abdelwahab ◽  
Soha MA Sayed ◽  
...  
Keyword(s):  
Vinyl Chloride ◽  
Uv Irradiation ◽  
Oxidation Process ◽  
Irradiation Time ◽  
Chemical Oxidation ◽  
Polymeric Chain ◽  
Conductivity Measurements ◽  
Uv Absorber ◽  
Poly Vinyl Chloride ◽  
Pvc Film

Conducting polymers have great attention due to their electrical activity in π-electrons conjugation over backbone of the polymeric chain. These properties make them attractive for enormous applications. On that account, we prepared polyanisidines (PAs) derivatives ( ortho, meta, and para) by chemical oxidation process using ammonium peroxydisulfate as an initiator. The prepared PAs were characterized using various techniques. Moreover, conductivity measurements of PA derivatives showed that the ortho-derivative gave the highest value. The prepared PAs were investigated as photostabilizers for poly(vinyl chloride) (PVC) films. Different PVC films were prepared in the absence and the presence of PA derivatives and they were exposed to ultraviolet (UV) irradiation for 30 days. The gel weight % for irradiated PVC films was followed as a function of irradiation time. The results revealed that the blank PVC film (free PA derivatives) was completely degraded reaching 100% gel content. PVC films contain PA derivatives showed higher photostability than PVC blank film. A comparison between the investigated PA derivatives as UV stabilizers and Chimassorb commercial UV absorber was also investigated. PA derivatives showed better efficiency as UV stabilizers than the commercial one till 288 h of UV irradiation.

scholarly journals Effects of UV Irradiation on the Sensing Properties of In2O3 for CO Detection at Low Temperature

Micromachines ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 338 ◽  
Author(s):  
Lucio Bonaccorsi ◽  
Angela Malara ◽  
Andrea Donato ◽  
Nicola Donato ◽  
Salvatore Gianluca Leonardi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Indium Oxide ◽  
Uv Irradiation ◽  
Operating Mode ◽  
Semiconductor Layer ◽  
Experimental Conditions ◽  
Sensing Material ◽  
Resistive Sensor ◽  
Co Detection ◽  
P Type

In this study, UV irradiation was used to improve the response of indium oxide (In2O3) used as a CO sensing material for a resistive sensor operating in a low temperature range, from 25 °C to 150 °C. Different experimental conditions have been compared, varying UV irradiation mode and sensor operating temperature. Results demonstrated that operating the sensor under continuous UV radiation did not improve the response to target gas. The most advantageous condition was obtained when the UV LED irradiated the sensor in regeneration and was turned off during CO detection. In this operating mode, the semiconductor layer showed an apparent “p-type” behavior due to the UV irradiation. Overall, the effect was an improvement of the indium oxide response at 100 °C toward low CO concentrations (from 1 to 10 ppm) that showed higher results than in the dark, which is promising to extend the detection of CO with an In2O3-based sensor in the sub-ppm range.

SYNTHESIS OF ASYMMETRIC DIYNES, DIFFERING IN NUMBER OF METHYLENE FRAGMENTS AND THEIR ABILITY TO SOLID STATE POLYMERIZATION

1970 ◽  
Author(s):  
Boris S. Tanaseichuk ◽  
Margarita K. Pryanichnikova ◽  
Alexey A. Burtasov
Keyword(s):  
Solid State ◽  
Uv Irradiation ◽  
Triple Bond ◽  
Color Change ◽  
Sodium Ethoxide ◽  
Polymerization Process ◽  
Solid State Polymerization ◽  
Bright Color ◽  
Two Stages ◽  
Conjugated Diynes

Asymmetric conjugate diynes are of considerable interest because of their ability to solid state polymerization to form polymers with an ordered tough polyene structure. The capacity of conjugated diynes to such polymerization is determined by the presence and nature of the substituents in the side chain diynes and the degree of their distance from the diacetylenic fragment. To evaluate the effect of the distance a bulky substituent of conjugate diyne′s fragment for ability of asymmetric diacetylenes ordered solid state polymerization were prepared 4 alkildiinil′s ether of p-hydroxybenzaldehyde with varying degrees of distance diyne′s fragment from the benzene ring.Synthesis of alkildiinil′s esters of p-hydroxybenzaldehyde was carried out in two stages. At the first stage by alkylation of p-hydroxybenzaldehyde of corresponding of toluenesulfonate′s terminal alkynol or ω-bromalkines in the presence of sodium ethoxide was prepared monoalkinil′s ether of p-hydroxybenzaldehyde, in which the terminal triple bond is separated from the phenoxyl′s fragment 1, 2, 3 and 4 methylene′s groups. Use as a alkylating agent of toluenesulfonate′s terminal alkynols, which differ in low volatility compared ω-bromalkines, gives a fairly high (~ 60%) the yield of desired products. At the second stage according to the method of Kadio-Chodkiewich the condensation-3-brompropin-2-ol with the corresponding monoalkinil′s esters of p-hydroxybenzaldehyde were alkildiynil′s ethers of p-hydroxybenzaldehyde, which have a terminal triple bond is separated from the benzene′s ring 1, 2, 3 and 4 methylene′s groups. The effect of the degree of remoteness of the conjugate diyne′s fragment from the bulk p-formilfenoksil′s substituents on these compounds ability to solid state polymerization under UV irradiation was studied by the asymmetric diynes. About the polymerization rate was judged visually by a color change. All investigated diynes exhibited the ability to solid state polymerization. The rate of it was largely dependent of the number of methylene′s fragments, separating p-formilfenoksil′s ring from diyne′s fragment. If the irradiation of diynes containing 3 or 4 methylene′s fragments, color change of almost colorless to dark brown occurred within 5-6 h, then diynes containing 1 or 2 of the methylene′s fragments was required for 24 h. It goes to show that the increase the length of the methylene′s chain, postpones surround p-formilfenoksil′s fragment from a paired diyne′s fragment, eases  the solid state polymerization. However, the absence of the bright color of the polymer characteristic polydiacetylene′s ordered structures indicates that, polymerization was not well-ordered in out case.Thus, the results showed that administration of methylene′s fragments, causing varying degrees of remoteness of the conjugate diyne′s fragment from the bulk p-formilfenoksil′s fragment, has a significant impact on the ability of asymmetric conjugate diynes to solid state polymerization under UV irradiation. The increase in the degree of remoteness promotes their solid state polymerization, those namely the structure of asymmetric diynes determines their behavior in the polymerization process.

Fully Plastic Dye Solar Cell Devices by Low-Temperature UV-Irradiation of both the Mesoporous TiO2Photo- and Platinized Counter-Electrodes

2013 ◽  
Vol 3 (10) ◽  
pp. 1292-1298 ◽  
Author(s):  
Valerio Zardetto ◽  
Francesco Di Giacomo ◽  
Diana Garcia-Alonso ◽  
Wytze Keuning ◽  
Mariadriana Creatore ◽  
...  
Keyword(s):  
Solar Cell ◽  
Low Temperature ◽  
Uv Irradiation ◽  
Counter Electrodes

scholarly journals Complementary Color Tuning by HCl via Phosphorescence-to-Fluorescence Conversion on Insulated Metallopolymer Film and Its Light-Induced Acceleration

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 244 ◽  
Author(s):  
Shunichi Kaneko ◽  
Hiroshi Masai ◽  
Takuya Yokoyama ◽  
Maning Liu ◽  
Yasuhiro Tachibana ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Color Change ◽  
Molecular Engineering ◽  
Next Generation ◽  
Color Tuning ◽  
Tunable Materials ◽  
Color Tunable ◽  
Complementary Color ◽  
Solid Film ◽  
New Guidelines

An insulated metallopolymer that undergoes phosphorescence-to-fluorescence conversion between complementary colors by an acid-stimulus is proposed as a color-tunable material. A Pt-based phosphorescent metallopolymer, where the conjugated polymeric backbone is insulated by a cyclodextrin, is depolymerized by HCl via acidic cleavage of Pt-acetylide bonds to form a fluorescent monomer. The insulation enables phosphorescence-to-fluorescence conversion to take place in the solid film. Rapid color change was achieved by accelerating the reaction between the metallopolymer and HCl by UV irradiation. These approaches are expected to provide new guidelines for the development of next-generation color-tunable materials and printable sensors based on precise molecular engineering.

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