发布求助
文献互助 智能选刊 最新文献

Polymer Photochemistry最新文献

筛选
英文 中文
Studies of the role of acetone triplets in the initiation of vinyl polymerization 丙酮三联体在乙烯基聚合引发反应中的作用研究
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90013-8
J.E. Guillet, A.N. Ainscough, T. Kilp, S. Poos, N.J. Turro
{"title":"Studies of the role of acetone triplets in the initiation of vinyl polymerization","authors":"J.E. Guillet,&nbsp;A.N. Ainscough,&nbsp;T. Kilp,&nbsp;S. Poos,&nbsp;N.J. Turro","doi":"10.1016/0144-2880(86)90013-8","DOIUrl":"10.1016/0144-2880(86)90013-8","url":null,"abstract":"<div><p>Triplet acetone generated from the thermal decomposition of tetramethyl-1,2-dioxethane was shown to be incapable of initiating the free radical polymerization of methyl methacrylate and styrene. Triplet acetone is rapidly quenched by energy transfer to the monomer, but the excited state of the monomer so produced does not initiate polymerization. Acetone does not initiate polymerization when irradiated into its <span><math><mtext>n</mtext><mtext>−π</mtext><msup><mi></mi><mn>∗</mn></msup></math></span> singlet state with UV irradiation in the absence of a co-sensitizer, but is effective when photolysed in the presence of triethylamine which quenches the acetone, possibly by resulting in the efficient formation of ketyl radicals. In contrast, methyl tert-butyl ketone is an effective initiator because of the more rapid rate of formation of radicals by α-cleavage when one of the substituents gives rise to a tertiary alkyl radical.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 6","pages":"Pages 439-446"},"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)90013-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87751774","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
Photodegradation of crosslinked polyethylene 交联聚乙烯的光降解
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90035-7
Ayako Torikai, Sachiko Asada, Kenji Fueki
{"title":"Photodegradation of crosslinked polyethylene","authors":"Ayako Torikai,&nbsp;Sachiko Asada,&nbsp;Kenji Fueki","doi":"10.1016/0144-2880(86)90035-7","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90035-7","url":null,"abstract":"<div><p>The photodegradation of crosslinked polyethylene has been studied by ultraviolet (UV) and Fourier transform infrared (FT-IR) spectroscopic techniques and by gel and density measurements. The formation of the diene-type compound as well as of the gel was observed in γ-irradiated polyethylene. The efficiency of photodegradation was estimated from the oxygenated and vinyl group formation observed, and by the change of gel fraction. The photodegradation of crosslinked polyethylene may be initiated by the absorption of a photon by diene-type compounds formed by γ-irradiation. The rate of photo-oxidation and chain scission is faster in crosslinked polyethylene than in uncrosslinked polymer. A photodegradation mechanism for polyethylene crosslinked by γ-irradiation is proposed on the basis of the experimental results.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 1","pages":"Pages 1-11"},"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)90035-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91681445","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: 14
Contents of volume 6 第六卷内容
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90045-X
{"title":"Contents of volume 6","authors":"","doi":"10.1016/0144-2880(86)90045-X","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90045-X","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 1","pages":"Pages i-iv"},"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)90045-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91681447","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 degradation and stabilisation 聚合物降解与稳定
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90052-7
Norman S. Allen
{"title":"Polymer degradation and stabilisation","authors":"Norman S. Allen","doi":"10.1016/0144-2880(86)90052-7","DOIUrl":"10.1016/0144-2880(86)90052-7","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 2","pages":"Pages 161-162"},"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)90052-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83088357","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
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 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90037-0
Julia Lucki, Song Zhong Jian , Jan F. Rabek, B. Rånby
{"title":"Antagonistic effects of hindered piperidines and organic sulphides in photostabilization of cis-1,4-polybutadiene","authors":"Julia Lucki,&nbsp;Song Zhong Jian ,&nbsp;Jan F. Rabek,&nbsp;B. Rånby","doi":"10.1016/0144-2880(86)90037-0","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90037-0","url":null,"abstract":"<div><p>The photostabilizing properties of the mixtures of organic sulphides (2,2′-thiobis(4-methyl-6-tert-butylphenol); bis-(4-hydroxyphenylene) sulphide; thio-oligomer of hydroxyphenylene sulphide; bis [β-(3,5-di-tert-butyl-4-hydroxybenzyl)-methylcarboxyethyl] sulphide; dilaurylthiodipropionate) and hindered piperidines (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate; 4-hydroxy-2,2,6,6-tetramethylpiperidino-1-oxy; 2,2,6,6-tetramethylpiperidine) in photostabilization of cis-1,4-polybutadiene have been studied by using IR, ESR and TLC methods. A mechanism for antagonistic effects between these two types of stabilizers has been proposed.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 1","pages":"Pages 27-47"},"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)90037-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91774341","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
The influence of polymer matrix on emission spectra of low molecular ketones at 77 K 聚合物基质对低分子酮在77 K下发射光谱的影响
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90004-7
Pavol Hrdlovič
{"title":"The influence of polymer matrix on emission spectra of low molecular ketones at 77 K","authors":"Pavol Hrdlovič","doi":"10.1016/0144-2880(86)90004-7","DOIUrl":"10.1016/0144-2880(86)90004-7","url":null,"abstract":"<div><p>The emission spectra of five low molecular ketones (benzophenone, 9-anthrone, 9,10-anthraquinone, xanthone and thioxanthone) in polymeric matrices, namely polyethylene (PE), isotactic polypropylene (iPP), atactic polypropylene (aPP), polystyrene (PS) and poly(methyl methacrylate) (PMMA), exhibit the same main features as in non-polar and polar glasses of low molecular solvents at 77 K. The emission spectrum of benzophenone is least dependent on polymer matrix. The best vibrationally resolved spectrum of anthrone and xanthone is attained in non-polar matrices such as PE, iPP and aPP at low concentration. The intensity of the short wavelength vibrational bands decreases whilst that of the long wavelength bands increases with increased concentration of ketone in the range between 0·1 and 3 wt%. Emission spectra of anthrone and xanthone are most sensitive to the polarity of the polymer matrix. No difference is observed in the emission spectra of aryl carbonyl chromophores in the microcrystalline and amorphous polymer matrices. Mono-exponential decay of the emission is observed for benzophenone, 9-anthrone and 9,10-anthraquinone in all matrices under study. The decay of xanthone emission is bi-exponential in all matrices. Thioxanthone exhibits bi-exponential decay in non-polar matrices such as PE and PP and mono-exponential in polar matrices such as PMMA and PS.</p><p>The sensitivity of the emission of 9-anthrone and xanthone can be used for evaluating the polarity of the polymer matrix. The concentration effect can substantially influence the spectra of low molecular compounds dispersed in the polymer matrix.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 5","pages":"Pages 359-377"},"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)90004-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76774956","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
The UV photolysis of N-acetyl amino acids studies by ESR as models for biological polypeptides 以ESR为模型研究n -乙酰基氨基酸的紫外光解反应
Polymer Photochemistry Pub Date : 1986-01-01 DOI: 10.1016/0144-2880(86)90036-9
D. Hill, J. H. O′donnell, P. J. Pomery, A. Whittaker
{"title":"The UV photolysis of N-acetyl amino acids studies by ESR as models for biological polypeptides","authors":"D. Hill, J. H. O′donnell, P. J. Pomery, A. Whittaker","doi":"10.1016/0144-2880(86)90036-9","DOIUrl":"https://doi.org/10.1016/0144-2880(86)90036-9","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"PP 1","pages":"13-25"},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84860970","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
Kinetics of sensitised photo-oxidation of polyvinyl chloride 聚氯乙烯敏化光氧化动力学研究
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90039-4
V.B. Ivanov, M.A. Zhuravlev
{"title":"Kinetics of sensitised photo-oxidation of polyvinyl chloride","authors":"V.B. Ivanov,&nbsp;M.A. Zhuravlev","doi":"10.1016/0144-2880(86)90039-4","DOIUrl":"10.1016/0144-2880(86)90039-4","url":null,"abstract":"<div><p>The quantum yields of accumulation of oxygen-containing groups, formation of free radicals and consumption of sensitisers were determined during irradiation of rigid polyvinyl chloride (PVC) films in air at room temperature. Sensitised oxidation of the polymer was shown to be characterised by the following features: (1) linear dependence of oxidation rate on light intensity; (2) insignificant hydroperoxide yield in comparison with carbonyl compound yield; (3) linear dependence of carbonyl group accumulation from the very start of the process; (4) short length (2–4) links of the polymer oxidation chain; (5) decay of peroxide radicals in air in accord with first-order reaction; (6) low (⋍0·5) yield of alkyl radicals from thermal transformation of peroxide radicals in vacuum; and (7) valency migration to considerable distances. A kinetic scheme for the process of sensitised oxidation has been suggested. The constants of the individual stages of the process have been estimated on the basis of experimental data.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 1","pages":"Pages 55-64"},"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)90039-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82246356","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: 13
Chemiluminescence of photo-irradiated polypropylene containing various additives 含各种添加剂的光辐照聚丙烯的化学发光
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90016-3
Jing-fen Cen, Fujiko Konoma, Zenjiro Osawa
{"title":"Chemiluminescence of photo-irradiated polypropylene containing various additives","authors":"Jing-fen Cen,&nbsp;Fujiko Konoma,&nbsp;Zenjiro Osawa","doi":"10.1016/0144-2880(86)90016-3","DOIUrl":"10.1016/0144-2880(86)90016-3","url":null,"abstract":"<div><p>Commercial isotactic polypropylene films containing various additives, namely a hindered phenol (BHT), an UV absorber (Tinuvin 326), a hindered piperidine (Sanol LS 770), and mixture of BHT and Sanol were photo-irradiated with or without a glass filter at ambient temperature, and chemiluminescence spectra of the films were measured. The chemiluminescence intensity of the photo-irradiated PP films increased with irradiation time, and the shape and the intensity were noticeably affected by the nature of the additives. In the photo-irradiated PP films containing BHT, an additional new peak was observed at <em>ca</em> 80–100°C, and the intensity of the new peak was remarkably enhanced by the combined use of BHT and Sanol. From the results obtained the origins of the chemiluminescence sources were discussed.</p></div>","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 6","pages":"Pages 469-481"},"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)90016-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80425689","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: 14
Polymer permeability 聚合物渗透
Polymer Photochemistry Pub Date : 1986-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0144-2880(86)90030-8
P.J. Robinson
{"title":"Polymer permeability","authors":"P.J. Robinson","doi":"10.1016/0144-2880(86)90030-8","DOIUrl":"10.1016/0144-2880(86)90030-8","url":null,"abstract":"","PeriodicalId":101036,"journal":{"name":"Polymer Photochemistry","volume":"7 3","pages":"Pages 237-238"},"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)90030-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113687395","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
首页 上一页 下一页 尾页
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
现在去查看 取消
×
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：604180095
Book学术官方微信
小红书