Polymer Photochemistry最新文献

筛选
英文 中文
Fading characteristics of some monoazo dyes on cellulose diacetate and polyamide films: Part II 一些单偶氮染料在双醋酸纤维素和聚酰胺薄膜上的褪色特性:第二部分
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90034-X
F.M. Tera , L.A. Abdou , M.N. Michael , A. Hebeish
{"title":"Fading characteristics of some monoazo dyes on cellulose diacetate and polyamide films: Part II","authors":"F.M. Tera ,&nbsp;L.A. Abdou ,&nbsp;M.N. Michael ,&nbsp;A. Hebeish","doi":"10.1016/0144-2880(85)90034-X","DOIUrl":"10.1016/0144-2880(85)90034-X","url":null,"abstract":"<div><p>The fading rate curves and the characteristic fading curves of seven azo dyes on cellulose diacetate (CDA) and polyamide (PA) films were examined. Fading was enhanced by prolonging the time of irradiation and decreased by increasing dye concentration on the substrate, irrespective of the nature of the latter or the dye used. However, the magnitude of fading was governed by structural characteristics of both dye and substrate. The results obtained suggested that dyes of higher ability to aggregate forming large and uniform particles were more resistant to fading than those forming smaller and/or a non-uniform size of dye aggregates. Similarly, substrates of higher polarity and porosity acted in favour of association of dye molecules, thereby impeding fading. These suggestions were, indeed, substantiated by measurements of the extinction <span><math><mtext>y</mtext><mtext>x</mtext></math></span> ratio after different irradiation periods.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90034-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86396952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Kinetics of photograft copolymerization of vinyl monomers to brominated poly(acrylonitrile) in dimethyl sulphoxide 乙烯基单体在二甲基亚砜中与溴化聚丙烯腈的光接枝共聚动力学
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90009-0
Hajime Miyama, Nobuyuki Fujii, Koetsu Ikeda, Atsushi Kuwano
{"title":"Kinetics of photograft copolymerization of vinyl monomers to brominated poly(acrylonitrile) in dimethyl sulphoxide","authors":"Hajime Miyama,&nbsp;Nobuyuki Fujii,&nbsp;Koetsu Ikeda,&nbsp;Atsushi Kuwano","doi":"10.1016/0144-2880(85)90009-0","DOIUrl":"10.1016/0144-2880(85)90009-0","url":null,"abstract":"<div><p>Photograft copolymerization of methoxypolyethyleneglycol methacrylate (SM) and 2-(dimethylamino)ethyl methacrylate (DAEM) to poly(acrylonitrile) containing bromine atoms (PANBr) in dimethyl sulphoxide was carried out and the changes of concentration of SM and DAEM with time were measured by thin-layer chromatography. Also, the change of concentration of bromine atoms in PANBr during the photolysis of PANBr was measured spectrophotometrically to determine the overall quantum yield of the photolysis reaction.</p><p>Simulation of the photograft copolymerization was carried out by substituting the overall quantum yield and other kinetic parameters such as monomer reactivity ratios, polymerization rate constants and φ factor, which were obtained separately, into equations for the photopolymerization. Agreement between data obtained from experiment and from calculation was very good.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90009-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84757053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Contents of volume 6 第六卷内容
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90046-6
{"title":"Contents of volume 6","authors":"","doi":"10.1016/0144-2880(85)90046-6","DOIUrl":"https://doi.org/10.1016/0144-2880(85)90046-6","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90046-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137409821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Colour difference analysis of lightfastness for some vat dyes 几种还原染料耐光性的色差分析
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(86)90040-0
S. Shakra, M. Ibrahim, A. Amera
{"title":"Colour difference analysis of lightfastness for some vat dyes","authors":"S. Shakra, M. Ibrahim, A. Amera","doi":"10.1016/0144-2880(86)90040-0","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90040-0","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72631742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Photoinduced graft copolymerization: XII—Graft copolymerization of methyl methacrylate onto wool using peroxydiphosphate as the photoinitiator 光诱导接枝共聚:以过氧化二磷酸为光引发剂,甲基丙烯酸甲酯在羊毛上的接枝共聚
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90012-0
Shashadhar Samal , Subasini Lenka, Padma L. Nayak, Gangadhar Sahu
{"title":"Photoinduced graft copolymerization: XII—Graft copolymerization of methyl methacrylate onto wool using peroxydiphosphate as the photoinitiator","authors":"Shashadhar Samal ,&nbsp;Subasini Lenka,&nbsp;Padma L. Nayak,&nbsp;Gangadhar Sahu","doi":"10.1016/0144-2880(85)90012-0","DOIUrl":"10.1016/0144-2880(85)90012-0","url":null,"abstract":"<div><p>The photoinduced graft copolymerization of methyl methacrylate onto wool fibers was investigated using peroxydiphosphate as the initiator. Up to a certain concentration of the monomer and the initiator the graft yield increased beyond that concentration a decreasing trend was observed. The reaction was carried out at four different temperatures and the energy of activation was evaluated. The kinetic data and other evidence indicate that the overall polymerization takes place by a radical mechanism. A suitable reaction scheme has been proposed.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90012-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88113312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Emission of substituted pyrylium and thiapyrylium salts: Phosphorescence and delayed fluorescence emission in polymeric matrices 取代pyryum和thiapyryum盐的发射:聚合基质中的磷光和延迟荧光发射
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90002-8
V. Wintgens, J. Pouliquen, J. Kossanyi, J.L.R. Williams, J.C. Doty
{"title":"Emission of substituted pyrylium and thiapyrylium salts: Phosphorescence and delayed fluorescence emission in polymeric matrices","authors":"V. Wintgens,&nbsp;J. Pouliquen,&nbsp;J. Kossanyi,&nbsp;J.L.R. Williams,&nbsp;J.C. Doty","doi":"10.1016/0144-2880(85)90002-8","DOIUrl":"10.1016/0144-2880(85)90002-8","url":null,"abstract":"<div><p>Pyrylium and thiapyrylium salts show interesting emission properties when incorporated in a rigid PMMA matrix. In addition to a strong prompt fluorescence emission, the 18 compounds studied show a delayed fluorescence which cannot be observed in solution, even at 77 K. The delayed fluorescence/phosphorescence ratio increases with the temperature. The activation barrier as well as the intersystem crossing from the lowest excited triplet state to the lowest excited singlet state have been measured for compounds <strong>4</strong>, <strong>8</strong>, <strong>11</strong>, and <strong>17</strong>. An absence of crossing point between the potential energy surfaces of the two excited states is put forward to explain the low value (ca. 10<sup>3</sup> s<sup>−1</sup>) of the intersystem crossing rate constant.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90002-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80515115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Effect of morphology on the photooxidation of polypropylene films 形态对聚丙烯薄膜光氧化的影响
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90041-7
F.P. La Mantia, G. Spadaro, D. Acierno
{"title":"Effect of morphology on the photooxidation of polypropylene films","authors":"F.P. La Mantia,&nbsp;G. Spadaro,&nbsp;D. Acierno","doi":"10.1016/0144-2880(85)90041-7","DOIUrl":"10.1016/0144-2880(85)90041-7","url":null,"abstract":"<div><p>Photooxidative degradation of polypropylene films with different morphology (degree of crystallinity and orientation) has been followed by means of mechanical tests. The kinetics of the photooxidation are significantly depressed on increasing crystallinity and especially orientation.</p><p>This behaviour has been interpreted in terms of the reinforcing action due to the oriented crystalline fibrils.</p><p>A correlation has been attempted between the photooxidative kinetics and a morphological parameter.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90041-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77074166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Studies of the electronic energy migration and trapping in polystyrene 聚苯乙烯中电子能量迁移和俘获的研究
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90025-9
K. Sienicki, C. Bojarski
{"title":"Studies of the electronic energy migration and trapping in polystyrene","authors":"K. Sienicki,&nbsp;C. Bojarski","doi":"10.1016/0144-2880(85)90025-9","DOIUrl":"10.1016/0144-2880(85)90025-9","url":null,"abstract":"<div><p>The transfer of electronic energy from polystyrene (PS) to an acceptor (a small molecule) as a function of PS concentration (c) in 1,2-dichloroethane has been studied. It has been concluded that in dilute PS solutions it is necessary to consider the energy migration (EM) in the PS chain, in contrast to concentrated PS solutions (<em>c</em>&gt;0·4 mol litre<sup>−1</sup>) in which the EM process does not take place. This has been explained by formation of intermolecular excimers, which along with intramolecular excimers, are responsible for the total restriction of the EM process in concentrated PS solutions.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90025-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83296015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Photosynthetic membranes. A model study of the influence of photoinitiated grafting and graft polymerization of 1,6-hexanediol diacrylate and 4-(N-ethyl,N-2-acryloxyethyl)amino-4′-nitro-azobenzene, as co-monomers, onto polypropylene ribbon, on permeation and diffusion coefficients of oxygen and nitrogen 光合膜。共单体1,6-己二醇二丙烯酸酯和4-(n -乙基,n -2-丙烯氧氧乙基)氨基-4′-硝基偶氮苯在聚丙烯带上光引发接枝和接枝聚合对氧和氮渗透扩散系数影响的模型研究
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90031-4
I.R. Bellobono, B. Marcandalli, E. Selli, D. Comi, L. Righetto
{"title":"Photosynthetic membranes. A model study of the influence of photoinitiated grafting and graft polymerization of 1,6-hexanediol diacrylate and 4-(N-ethyl,N-2-acryloxyethyl)amino-4′-nitro-azobenzene, as co-monomers, onto polypropylene ribbon, on permeation and diffusion coefficients of oxygen and nitrogen","authors":"I.R. Bellobono,&nbsp;B. Marcandalli,&nbsp;E. Selli,&nbsp;D. Comi,&nbsp;L. Righetto","doi":"10.1016/0144-2880(85)90031-4","DOIUrl":"10.1016/0144-2880(85)90031-4","url":null,"abstract":"<div><p>Photoinitiated grafting and graft polymerization of 1,6-hexanediol diacrylate (<strong>I</strong>) and 4-(N-ethyl,N-2-acryloxyethyl)amino-4′-nitro-azobenzene (<strong>II</strong>) as co-monomers with a fixed molar ratio <strong>I</strong>:<strong>II</strong> equal to 10, in the presence of 1,2-diphenyl-2,2-dimethoxyethanone (<strong>III</strong>) as photoinitiator with a ratio R of its molar concentration of 0.005-0.38 with respect to the sum of molar concentrations of <strong>I</strong> and <strong>II</strong>, were studied using a polypropylene ribbon as a model system of a macroporous substrate. By polychromatic irradiation at 45°C with energy inputs of 90 mW cm<sup>−2</sup>, ultrathin layers of co-polymer, able to function as asymmetric membranes, could thus be obtained. Mean polychromatic quantum yields of grafting and graft polymerization, as a function of R, were also measured. Membrane specimens with constant values of grafted (200±20) and graft polymerized (500±80) molecules of monomer units in co-polymer per unit apparent surface (Å<sup>2</sup>) have been subjected to measurements of permeabilities (P) and diffusivities (D) at 25°C for oxygen and nitrogen, as a function of R. Results show that only an optimum R minimizes P and D, and a narrow range of R-values allows a normal membrane behaviour.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90031-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80788930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Spectroscopic and photoconductive properties of polymers containing trans-1,2-bis(9-carbazolyl)cyclobutane units sensitized by 2,4,7-trinitrofluorenone 2,4,7-三硝基芴酮敏化含有反式-1,2-二(9-咔唑基)环丁烷单元的聚合物的光谱和光导性质
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90027-2
Shigeo Tazuke, Takashi Inoue, Shogo Saito , Sumio Hirota , Hiroshi Kokado
{"title":"Spectroscopic and photoconductive properties of polymers containing trans-1,2-bis(9-carbazolyl)cyclobutane units sensitized by 2,4,7-trinitrofluorenone","authors":"Shigeo Tazuke,&nbsp;Takashi Inoue,&nbsp;Shogo Saito ,&nbsp;Sumio Hirota ,&nbsp;Hiroshi Kokado","doi":"10.1016/0144-2880(85)90027-2","DOIUrl":"10.1016/0144-2880(85)90027-2","url":null,"abstract":"<div><p>A number of polymers containing trans-1,2-bis(9-carbazolyl)cyclobutane (DCzB) were examined for their photoconductivity in the presence of 2,4,7-trinitrofluorenone (TNF) and the results were correlated with the photophysical properties (excimer formation, energy migration, fluorescence quantum yield and fluorescence lifetime). Excimer formation by DCzB groups is sterically hindered whereas energy migration occurs efficiently in the DCzB polymers. Also, charge-transfer interaction with TNF is stronger for the DCzB polymers than for poly(9-vinylcarbazole) (PVCz). Photoconductivity of the DCzB polymers was better than that of PVCz when the charge-transfer band of the TNF-carbazole pair was irradiated, which agreed well with the photophysical observation. Although carrier generation and carrier transport processes could not be separately discussed at the moment, DCzB was shown to be a promising chromophore for photoconductive polymers.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(85)90027-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89251775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信