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Photochemical properties of phenyl vinyl ketone copolymers in solid state and solution 苯基乙烯基酮共聚物在固态和溶液中的光化学性质
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90045-4
G. Nenkov, T. Bogdantsaliev, T. Georgieva, V. Kabaivanov
{"title":"Photochemical properties of phenyl vinyl ketone copolymers in solid state and solution","authors":"G. Nenkov,&nbsp;T. Bogdantsaliev,&nbsp;T. Georgieva,&nbsp;V. Kabaivanov","doi":"10.1016/0144-2880(85)90045-4","DOIUrl":"10.1016/0144-2880(85)90045-4","url":null,"abstract":"<div><p>The temperature-dependent photodegradation of styrene, methyl methacrylate and butyl acrylate copolymers with phenyl vinyl ketone in the solid state and in solution on irradiation with monochromatic light at 313 nm was investigated. The quantum yields of main chain scission, <em>Φ</em><sub><em>cs</em></sub>, were calculated. It was found that the <em>Φ</em><sub><em>cs</em></sub> values in solution are higher than those in a film at ambient temperature. It is shown that these values do not equalize at temperatures above the glass transition temperature, T<sub><em>g</em></sub>, of the copolymers.</p><p>This is confirmed for the model system butyl acrylate-phenyl vinyl ketone copolymer, studied for the first time. We assume that the experimental temperature has a greater influence on the photooxidation processes of the copolymers examined than thier physical state.</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)90045-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84787882","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
Photopolymerization initiated by charge-transfer complex: VIII—Effect of solvent 电荷转移络合物引发的光聚合:viii——溶剂的影响
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90004-1
Subasini Lenka, Padma L. Nayak, Sanjay K. Nayak
{"title":"Photopolymerization initiated by charge-transfer complex: VIII—Effect of solvent","authors":"Subasini Lenka,&nbsp;Padma L. Nayak,&nbsp;Sanjay K. Nayak","doi":"10.1016/0144-2880(85)90004-1","DOIUrl":"10.1016/0144-2880(85)90004-1","url":null,"abstract":"<div><p>Polymerization of methyl methacrylate in visible light was studied at 35°C using quinaldine-chlorine (QU-Cl<sub>2</sub>) charge-transfer complex as the photoinitiator in the presence of several solvents. Analysis of kinetic and other data indicate that the polymerization proceeds via a radical mechanism and the termination is initiator dependent. Chain termination via degradative chain (initiator) transfer appears to be significant here.</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)90004-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72842001","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
Polymer photophysics: A model approach 聚合物光物理:模型方法
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90026-0
F.C. De Schryver, J. Vandendriessche, K. Demeyer, P. Collart, N. Boens
{"title":"Polymer photophysics: A model approach","authors":"F.C. De Schryver,&nbsp;J. Vandendriessche,&nbsp;K. Demeyer,&nbsp;P. Collart,&nbsp;N. Boens","doi":"10.1016/0144-2880(85)90026-0","DOIUrl":"10.1016/0144-2880(85)90026-0","url":null,"abstract":"<div><p>The study of the excited state behaviour of 2,4-diarylpentanes and 1,1′-diaryl diethyl ethers illustrates the importance of configurational and conformational aspects in the intramolecular excimer formation of di- and poly-chromophoric systems. This model approach is a first step in the understanding of complex polymer photophysics.</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)90026-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74835374","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: 9
Further studies on the effects of temperature and γ-radiation on the electrical and optical properties of some solid alizarin and quinizarin metal chelates 温度和γ辐射对某些固体茜素和奎尼茜素金属螯合物电学和光学性质影响的进一步研究
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90030-2
M.M. Abou Sekkina, M.A. Ewaida
{"title":"Further studies on the effects of temperature and γ-radiation on the electrical and optical properties of some solid alizarin and quinizarin metal chelates","authors":"M.M. Abou Sekkina,&nbsp;M.A. Ewaida","doi":"10.1016/0144-2880(85)90030-2","DOIUrl":"10.1016/0144-2880(85)90030-2","url":null,"abstract":"<div><p>Niobium(V) and tantalum(V) react with Alizarin Red S(AlRS) and quinizarin-3-sulphonic acid (QuS) to give the corresponding solid metal chelates. Their infrared and electronic absorption spectra were studied in the solid state. The temperature dependence of the DC electrical conductivity, activation energy for conduction and energy gap were evaluated and discussed in detail and in relation to their molecular structures and optical properties. The effects of a γ-absorbed dose (5×10<sup>7</sup> rad) on the IR and electronic absorption spectra and DC electrical conductivity were demonstrated and discussed. For 1:2 complexes, superconductivity or metallic conductivity was induced by the action of ionizing radiation. A suggested mechanism was put forward for the γ-absorbed dose induced superconductivity in the 1:2 complexes of AlRS and QuS polycrystals. The possibility of their application as absorbers and/or detectors for energetic ionizing radiation was established.</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)90030-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76169832","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
A reversible photoreaction of iron(III) chloride in poly(vinyl chloride) film 氯化铁(III)在聚氯乙烯薄膜中的可逆光反应
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90003-X
E.D. Owen, S.R. Brooks
{"title":"A reversible photoreaction of iron(III) chloride in poly(vinyl chloride) film","authors":"E.D. Owen,&nbsp;S.R. Brooks","doi":"10.1016/0144-2880(85)90003-X","DOIUrl":"10.1016/0144-2880(85)90003-X","url":null,"abstract":"<div><p>Poly(vinyl chloride) (PVC) films containing FeCl<sub>3</sub> showed absorption spectra in the 300–400 nm region which were characteristic of FeCl<sup>−</sup><sub>4</sub>. On irradiation of the films in air the absorptions were reduced in intensity but were restored in a subsequent dark reaction to levels which were higher than those before irradiation. The relation between these systems and doped polyacetylene is discussed.</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)90003-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84560065","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
Photoinduced graft copolymerization: X—Graft copolymerization of methyl methacrylate onto wool using isoquinoline-sulphur dioxide charge-transfer complex as the initiator 光诱导接枝共聚:以异喹啉-二氧化硫电荷转移络合物为引发剂，甲基丙烯酸甲酯在羊毛上的x接枝共聚
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90028-4
Shashadhar Samal , Subasini Lenka, Padma L. Nayak, G. Sahu
{"title":"Photoinduced graft copolymerization: X—Graft copolymerization of methyl methacrylate onto wool using isoquinoline-sulphur dioxide charge-transfer complex as the initiator","authors":"Shashadhar Samal ,&nbsp;Subasini Lenka,&nbsp;Padma L. Nayak,&nbsp;G. Sahu","doi":"10.1016/0144-2880(85)90028-4","DOIUrl":"10.1016/0144-2880(85)90028-4","url":null,"abstract":"<div><p>The photoinduced graft copolymerization of methyl methacrylate onto wool fibre was investigated using an isoquinoline-sulphur dioxide charge-transfer complex as the initiator. The percentage of graft yield increases with increasing concentration of the monomer and the initiator. The reaction was carried out at three different concentrations and the overall activation energy was computed. The kinetic data and other evidence indicate that the overall polymerization takes place by a radical mechanism. A suitable kinetic scheme has been suggested.</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)90028-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79642051","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: 7
Matrix effects in erythrosine sensitized photolysis of diazo compounds 红酶敏化重氮化合物光解的基质效应
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90032-6
H. Böttcher, J. Marx, F.W. Müller, U. Papendieck
{"title":"Matrix effects in erythrosine sensitized photolysis of diazo compounds","authors":"H. Böttcher,&nbsp;J. Marx,&nbsp;F.W. Müller,&nbsp;U. Papendieck","doi":"10.1016/0144-2880(85)90032-6","DOIUrl":"10.1016/0144-2880(85)90032-6","url":null,"abstract":"<div><p>Investigations have been made on erythrosine sensitized photolysis of 4-diethylaminobenzene diazonium salt <strong>1</strong> and 2-diazo-1-oxo-1,2-dihydronaphthalene <strong>2</strong> in polymeric binders of different glass transition temperatures (T<sub><em>g</em></sub> 30–185°C). In the case of <strong>1</strong> the efficiency of photolysis as well as the quenching of direct and delayed fluorescence increase with decreasing T<sub><em>g</em></sub>; in the case of <strong>2</strong>, however, they increase with increasing T<sub><em>g</em></sub>. The addition of plasticizers causes analogous effects. It is assumed that the sensitization of <strong>1</strong> occurs preferentially from the S<sub>1</sub>-state, whilst in case of <strong>2</strong> it is from the T<sub>1</sub>-state of erythrosine. Probability calculations reveal that the effective concentrations of the reactants within the critical radius of electron transfer are low, accounting for the low efficiency of the sensitized photolysis.</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)90032-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82205772","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: 2
Biomass photochemistry: VI—Light-induced oxidation of phlobaphene from wood 生物质光化学:vi -木材中酚醛的光诱导氧化
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90036-3
Nelson Durán, Jaime Baeza, Juanita Freer, Ninon Rojas, Maria G Nascimento
{"title":"Biomass photochemistry: VI—Light-induced oxidation of phlobaphene from wood","authors":"Nelson Durán,&nbsp;Jaime Baeza,&nbsp;Juanita Freer,&nbsp;Ninon Rojas,&nbsp;Maria G Nascimento","doi":"10.1016/0144-2880(85)90036-3","DOIUrl":"10.1016/0144-2880(85)90036-3","url":null,"abstract":"<div><p>Phlobaphene from <em>Pinus radiata</em> D. Don bark upon photolysis in the presence of oxygen causes a rapid bleaching. The final product from the photooxidation was isolated and analysed showing it to be an oligomer of low molecular weight with 3·5±0·5 carboxylic acid units per catechin unit. The same product was obtained from photolysis of catechin under the same conditions. Phlobaphene showed excellent sensitizer properties using guanosine as a singlet oxygen detector.</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)90036-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87481630","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
Free radical formation and degradation of cellulose by ionizing radiations 电离辐射对纤维素自由基形成和降解的影响
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90020-X
Yoshio Nakamura , Yoshitaka Ogiwara , Glyn O. Phillips
{"title":"Free radical formation and degradation of cellulose by ionizing radiations","authors":"Yoshio Nakamura ,&nbsp;Yoshitaka Ogiwara ,&nbsp;Glyn O. Phillips","doi":"10.1016/0144-2880(85)90020-X","DOIUrl":"10.1016/0144-2880(85)90020-X","url":null,"abstract":"<div><p>Free radicals produced during interaction of visible, ultraviolet and ionizing radiations with cellulose have been identified by reference to the available experimental ESR evidence and recent ESR-ENDOR spectroscopy. The subsequent chemical transformations of these radicals were deduced by reference to the products derived by radiation chemical studies of carbohydrate systems.</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)90020-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83091564","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: 32
Mechanism and kinetics of photoradical reactions in polyacrylic acid 聚丙烯酸中光自由基反应的机理和动力学
Polymer Photochemistry Pub Date : 1985-01-01 DOI: 10.1016/0144-2880(85)90024-7
E.N. Seropegina, G.G. Kochetkova, N.V. Fock, M.Ya. Mel'nikov
{"title":"Mechanism and kinetics of photoradical reactions in polyacrylic acid","authors":"E.N. Seropegina,&nbsp;G.G. Kochetkova,&nbsp;N.V. Fock,&nbsp;M.Ya. Mel'nikov","doi":"10.1016/0144-2880(85)90024-7","DOIUrl":"10.1016/0144-2880(85)90024-7","url":null,"abstract":"<div><p>Photochemical conversion of paramagnetic centres formed under γ-irradiation of polyacrylic acid (PAA) at 77 K has been studied. Middle macroradicals of PAA are involved in the photodissociation reaction to form hydroxyl radicals. They are also found to be capable of recombining. A scheme for the photoradical processes in PAA at 77 K is 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)90024-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83638035","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
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