Polymer Photochemistry最新文献

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Photolysis of Poly[1-(4-substituted phenyl)-2-propen-1-one] in the solid phase 聚[1-(4-取代苯基)-2-丙烯-1- 1]在固相中的光解反应
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90012-6
P. Hrdlovič , J.E. Guillet
{"title":"Photolysis of Poly[1-(4-substituted phenyl)-2-propen-1-one] in the solid phase","authors":"P. Hrdlovič ,&nbsp;J.E. Guillet","doi":"10.1016/0144-2880(86)90012-6","DOIUrl":"10.1016/0144-2880(86)90012-6","url":null,"abstract":"<div><p>Photolysis of poly[1-(4-substituted phenyl]-2-propen-1-ones] in film of thickness 5–10 μm was followed by automatic viscometry, lowangle laser light scattering (LALLS) and gel permeation chromatography (GPC) under irradiation at 313 and 285·8 nm in air. The substituents in position 4 of the benzene ring were: H, fluoro, chloro, methoxy and ethyl. The monitoring of degradation by automatic viscometry and LALLS enabled determination of the Mark-Houwink parameters α and K for the above polymers in chlorobenzene at 25°C as follows. H: <em>α</em> = 0·76 ± 0·03, K = 3·8 × 10<sup>−3</sup>; 4-F: <em>α</em> = 0·69 ± 0·02, K = 6·1 × 10<sup>−3</sup>; 4-Cl: <em>α</em> = 0·79 ± 0·03, K = 1·4 × 10<sup>−3</sup>; 4-C<sub>2</sub>H<sub>5</sub>: <em>α</em> = 0·85 ± 0·03, K = 1·3 × 10<sup>−3</sup>; 4-OCH<sub>3</sub>: <em>α</em> = 0·75 ± 0·06, K = 2·3 × 10<sup>−3</sup>. The plots of main chain scission versus time were curved, which indicates inhibition at the later stage of degradation. The initial quantum yields of main chain scissions are about 0·08 except for the 4-methoxy derivative, in which case strong oxygen quenching causes the quantum yield to lie one order of magnitude lower. The unsaturated ketone formed during photolysis quenches the main chain scissions with Stern-Volmer constants which lie within the range 50–150 mol<sup>−1</sup> for the polyketones under study.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90012-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74697106","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: 5
Organic phototransformations in non-homogeneous media 非均匀介质中的有机光转化
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90031-X
F. Wilkinson
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引用次数: 7
Antagonistic effects of hindered piperidines and organic sulphides in photostabilization of cis-1,4-polybutadiene 受阻哌啶和有机硫化物在顺式-1,4-聚丁二烯光稳定中的拮抗作用
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90037-0
J. Lucki, S. Jian, J. Rabek, B. Rånby
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引用次数: 10
Flash photolysis of lignin: Part 1. Deaerated solutions of dioxane-lignin 木质素的闪光光解:第1部分。二氧六烷-木质素的脱氧溶液
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90007-2
Miguel G. Neumann, Robert A.M.C. De Groote, Antonio E.H. Machado
{"title":"Flash photolysis of lignin: Part 1. Deaerated solutions of dioxane-lignin","authors":"Miguel G. Neumann,&nbsp;Robert A.M.C. De Groote,&nbsp;Antonio E.H. Machado","doi":"10.1016/0144-2880(86)90007-2","DOIUrl":"10.1016/0144-2880(86)90007-2","url":null,"abstract":"<div><p>Low molecular weight dioxane-lignin has been submitted to flash photolysis in deaerated solutions. The transient spectra show absorption maxima that can be identified with ketyl and phenoxy radicals, confirming that the initial mechanism is the abstraction of a phenolic hydrogen by a triplet excited carbonyl. The second-order decay rates, ca <span><math><mtext>10</mtext><msup><mi></mi><mn>9</mn></msup><mtext>M</mtext><msup><mi></mi><mn>−1</mn></msup><mtext>s</mtext><msup><mi></mi><mn>−1</mn></msup></math></span>, are also consistent with the nature of those radicals. Flash photolysis of model compounds vanillin and p-hydroxybenzaldehyde showed similar behaviour. The photolysis of a model compound (Ether I) with no carbonyl or phenol groups confirmed the occurrence of β-scission as the photolytic pathway.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90007-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73180284","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: 19
Polyvinyl chloride degradation 聚氯乙烯降解
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90010-2
N.S. Allen
{"title":"Polyvinyl chloride degradation","authors":"N.S. Allen","doi":"10.1016/0144-2880(86)90010-2","DOIUrl":"10.1016/0144-2880(86)90010-2","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90010-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87335947","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
Photodegradation of crosslinked polyethylene 交联聚乙烯的光降解
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90035-7
A. Torikai, Sachiko Asada, K. Fueki
{"title":"Photodegradation of crosslinked polyethylene","authors":"A. Torikai, Sachiko Asada, K. Fueki","doi":"10.1016/0144-2880(86)90035-7","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90035-7","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84725230","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: 15
Contents of volume 7 第七卷内容
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90023-0
{"title":"Contents of volume 7","authors":"","doi":"10.1016/0144-2880(86)90023-0","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90023-0","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90023-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137197702","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
Effect of light irradiation in the chiral complex of poly(l-lysine) with Methyl Orange 光照射对聚赖氨酸与甲基橙手性配合物的影响
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90003-5
Hiroyuki Yamamoto, Ayako Nishida, Katsuhiko Inouye
{"title":"Effect of light irradiation in the chiral complex of poly(l-lysine) with Methyl Orange","authors":"Hiroyuki Yamamoto,&nbsp;Ayako Nishida,&nbsp;Katsuhiko Inouye","doi":"10.1016/0144-2880(86)90003-5","DOIUrl":"10.1016/0144-2880(86)90003-5","url":null,"abstract":"<div><p>The effect of light irradiation in the chiral complex of poly(<span>l</span>-lysine) (PLL) with Methyl Orange (MO) was investigated by means of absorption and circular dichroism (c.d.) measurements. Upon irradiation with ultraviolet or visible light, the magnitudes of the induced c.d. of the PLL-MO complex decreased together with a decrease in skew dimeric dye species. As more photons were irradiated, the induced c.d. decreased much faster. The lowermolecular-weight complex and higher temperature caused faster decrease of the induced c.d. The change was irreversible under dark or re-irradiation conditions.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90003-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72912666","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
Photopolymerization of the N,N-dialkylaminoethyl methacrylate-benzophenone system N,N-二烷基氨基甲基丙烯酸乙酯-二苯甲酮体系的光聚合
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90058-8
Guang-Jie Jiang, Yasuhiko Shirota, Hiroshi Mikawa
{"title":"Photopolymerization of the N,N-dialkylaminoethyl methacrylate-benzophenone system","authors":"Guang-Jie Jiang,&nbsp;Yasuhiko Shirota,&nbsp;Hiroshi Mikawa","doi":"10.1016/0144-2880(86)90058-8","DOIUrl":"10.1016/0144-2880(86)90058-8","url":null,"abstract":"<div><p>In order to search for photoradical polymerization systems that are not subject to oxygen inhibition, photoradical polymerization of the N,N-dialkylaminoethyl methacrylate—aryl ketone system has been studied. It was found that photoradical polymerization of this system, where N,N-dialkylaminoethyl methacrylate functions both as a co-initiator and as a monomer, is accelerated in the presence of oxygen. The polymerization rate was faster with N,N-diethylaminoethyl methacrylate than with the N,N-dimethyl analogue. Crosslinking occurred rapidly in the presence of a multifunctional acrylate monomer, resulting in the formation of gels. As compared with photopolymerizations of acrylate monomers using non-polymerizable, low-molecular-weight alkylamine-aryl ketone combinations as photo-initiators, the present system has an advantage that less low-molecular-weight amine remains in the exposed area because it polymerizes.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90058-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90078334","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: 22
Heterocyclic ylide initiated photopolymerization of methyl methacrylate 杂环酰基引发甲基丙烯酸甲酯的光聚合
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90025-4
S. Saini, A.K. Srivastava
{"title":"Heterocyclic ylide initiated photopolymerization of methyl methacrylate","authors":"S. Saini,&nbsp;A.K. Srivastava","doi":"10.1016/0144-2880(86)90025-4","DOIUrl":"10.1016/0144-2880(86)90025-4","url":null,"abstract":"<div><p>Solution polymerization of methyl methacrylate (MMA) was carried out in the presence of visible light (440 nm) using β-picolinium p-chlorophenacylide as a photoinitiator at 30°C. The initiator and monomer exponent values were calculated to be 0·5 and 1·0 ± 0·01, respectively. An average value of <span><math><mtext>k</mtext><msub><mi></mi><mn>p</mn></msub><msup><mi></mi><mn>2</mn></msup><mtext>k</mtext><msub><mi></mi><mn>t</mn></msub></math></span> was 4·07 × 10<sup>−2</sup>. The polymerization was retarded in the presence of hydroquinone; however, a nonpolar solvent (cyclohexane) enhanced the rate of polymerization. Kinetic data and ESR studies indicate that the overall polymerization takes place by a radical mechanism via triplet carbene formation which acts as a source of free radicals.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0144-2880(86)90025-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89466850","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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