发布求助
文献互助 智能选刊 最新文献

Polymer Science U.s.s.r.最新文献

筛选
英文 中文
Calorimetric study of the glass transition in gelatin 明胶玻璃化转变的量热研究
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90114-6
G.I. Tsereteli, O.I. Smirnova
{"title":"Calorimetric study of the glass transition in gelatin","authors":"G.I. Tsereteli,&nbsp;O.I. Smirnova","doi":"10.1016/0032-3950(91)90114-6","DOIUrl":"10.1016/0032-3950(91)90114-6","url":null,"abstract":"<div><p>The temperature variation of the absolute heat capacity values of crystalline and amorphous gelatin at various water concentrations was studied by the DSC method in a broad temperature range (from -50 to 130°C). At all concentrations of bound water (5–30%), with amorphous gelatins a heat capacity jump is observed, caused by devitrification (softening). The value of this jump was determined to amount to 0.50±0.05 J/g K. With increasing content of bound water, the glass temperature decreases. The appearance of free water in the system substantially affects the process of devitrification (softening). In contrast to bound water, free water does not act as plasticizer, but on the contrary, it forms a rigid ice matrix which prevents the appearance of a glass transition. It was determined how the glass-transition process is manifested in the course of heating of crystalline gelatins, of various heats of melting. In gelatins with small heats of melting, ≤ J/g, the glass-transition process practically does not differ from the process in amorphous gelatins of the same water content. In gelatins with greater heats of melting (≈ 30 j/g), softening only leads to the appearance of an additional small maximum on the linear heat-capacity-temperature plot, a heat-capacity jump is not observed.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 10","pages":"Pages 2119-2125"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90114-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73206489","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
Copolymers of 9-vinylcarbazole with organosilicon vinyl monomers 9-乙烯基咔唑与有机硅乙烯基单体的共聚物
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90046-S
L.L. Gaintseva, G.N. Kurov, V.P. Baryshok, N.F. Lazareva, G.I. Rybalko, V.I. Gaidyalis, A.I. Girdzhyushas, L.S. Romanenko
{"title":"Copolymers of 9-vinylcarbazole with organosilicon vinyl monomers","authors":"L.L. Gaintseva,&nbsp;G.N. Kurov,&nbsp;V.P. Baryshok,&nbsp;N.F. Lazareva,&nbsp;G.I. Rybalko,&nbsp;V.I. Gaidyalis,&nbsp;A.I. Girdzhyushas,&nbsp;L.S. Romanenko","doi":"10.1016/0032-3950(91)90046-S","DOIUrl":"10.1016/0032-3950(91)90046-S","url":null,"abstract":"<div><p>New copolymers of 9-vinylcarbazole with silicoorganic vinyl compounds have been obtained, and the relative reactivity of the monomers and microstructure of the copolymers are evaluated. It is shown that some of the copolymers synthesized have photosensitivity comparable with that of polyvinylcarbazole, but have better mechanical properties, and can thus be recommended as materials for information recording.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 8","pages":"Pages 1603-1607"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90046-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86508351","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
A Rayleigh light scattering method of studying the structure of epoxide oligomers 用瑞利光散射法研究环氧化合物低聚物的结构
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90280-4
R.R. Garifullin, A.G. Farrakhov, V.G. Khozin
{"title":"A Rayleigh light scattering method of studying the structure of epoxide oligomers","authors":"R.R. Garifullin,&nbsp;A.G. Farrakhov,&nbsp;V.G. Khozin","doi":"10.1016/0032-3950(91)90280-4","DOIUrl":"10.1016/0032-3950(91)90280-4","url":null,"abstract":"<div><p>The structural inhomogeneity of epoxide oligomers of MM 340 to 3000 is studied by Rayleigh light scattering. Expoxide oligomers contain thermally stable and unstable structural formations (associates). ifferent oligomer fractions take part in the formation of associates are broken, and there is a temperature limit at which they are completely destroyed. In the case of the diglycidyl ester of d diphenylolpropane and ED-20 oligomer this occurs at 90°C.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 1","pages":"Pages 128-132"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90280-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81877209","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
Determination of the volume and density of inter- and intrafibrillar amorphous components in partially crystalline polymers 部分结晶聚合物中纤维间和纤维内非晶组分的体积和密度的测定
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90210-H
R.L. Khalfin
{"title":"Determination of the volume and density of inter- and intrafibrillar amorphous components in partially crystalline polymers","authors":"R.L. Khalfin","doi":"10.1016/0032-3950(91)90210-H","DOIUrl":"10.1016/0032-3950(91)90210-H","url":null,"abstract":"<div><p>The dependence of the intensity of small angle X-ray scattering on the degree of elastic stretching of a polymer is specified. The use of this dependence without further assumptions on mass exchange in the amorphous component of the polymer leads to the conclusion that the high density of the intrafibrillar amorphous component is maintained over the entire polymer irrespective of the degree of elastic stretching. Formulae are derived for calculating the relative volumes occupied by the inter- and intrafibrillar amorphous layers in the polymer. A method is proposed for determining the density of the inter- and intrafibrillar amorphous components of the polymer from the results of small angle X-ray diffraction (in absolute units). Taking PE as an example it is shown that the results of determination of the density of the intrafibrillar amorphous intervals in elastically stretched samples by methods of measurement in absolute and relative units match.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 6","pages":"Pages 1075-1085"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90210-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88669919","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
Radiation-chemical processes proceeding in cellulose nitrate in the presence of anti-radiation additives 在含有抗辐射添加剂的硝酸纤维素中进行的辐射化学过程
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90077-4
A.T. Govorkov
{"title":"Radiation-chemical processes proceeding in cellulose nitrate in the presence of anti-radiation additives","authors":"A.T. Govorkov","doi":"10.1016/0032-3950(91)90077-4","DOIUrl":"10.1016/0032-3950(91)90077-4","url":null,"abstract":"<div><p>The effect of γ-radiation on degradation processes proceeding in cellulose nitrate was studied by capillary viscometry and by following the changes of physical and mechanical characteristics of the polymer. The Gaussian character of the distribution of limiting strength is preserved after irradiation. The effects of γ-radiation involve a lowering of the limiting strength, increase of sample inhomogeneity and an increased scatter of physico-mechanical properties. By introducing anti-radiation additives of an aromatic type one can depress the yield of reactions leading to chain rupture. The mechanism of the protective action of anti-radiation additives of various type was investigated.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 11","pages":"Pages 2276-2282"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90077-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81389969","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
Crazing on stretching of samples of high density polyethylene of different molecular mass in liquid media 不同分子质量高密度聚乙烯试样在液体介质中的拉伸研究
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90163-K
A.V. Yefimov, N.N. Valiotti, N.F. Bakeyev
{"title":"Crazing on stretching of samples of high density polyethylene of different molecular mass in liquid media","authors":"A.V. Yefimov,&nbsp;N.N. Valiotti,&nbsp;N.F. Bakeyev","doi":"10.1016/0032-3950(91)90163-K","DOIUrl":"10.1016/0032-3950(91)90163-K","url":null,"abstract":"<div><p>The effect of MM on the strain of high density polyethylene (HDPE) in liquid media is studied. It is established that the effectiveness of the action of the liquid media, as evaluated from the value of the decrease in yield point of the polymer, is inversely related to the MM of the HDPE. This effect is determined by the decrease in the liability of the crystalline polymer to undergo crazing in liquid media with increase in MM.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 5","pages":"Pages 954-960"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90163-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75686574","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 method for measuring osmotic pressure of low-molar-mass compounds in polymers 一种测量聚合物中低摩尔质量化合物渗透压的方法
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90206-6
M.A. Mirkin
{"title":"A method for measuring osmotic pressure of low-molar-mass compounds in polymers","authors":"M.A. Mirkin","doi":"10.1016/0032-3950(91)90206-6","DOIUrl":"10.1016/0032-3950(91)90206-6","url":null,"abstract":"<div><p>Sorption combined with hydrostatic weighing is proposed as a method for the determination of osmotic pressure in dependence on temperature and hydrostatic pressure. By measuring changes in weight and volume of a polymer membrane one can determine the density of a mixture of vapour and liquid resulting from condensation. Formulae that relate the osmotic pressure and the entropy of the mixture have been derived. The reversibility of volume deformation in a swollen polymer has been checked.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 2","pages":"Pages 381-385"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90206-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86509564","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
Features of the iodide modification of polypyromellitimide 聚吡咯甲酰亚胺的碘化物改性特性
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90123-8
N.B. Mel'nikova, Ye.G. Kochneva
{"title":"Features of the iodide modification of polypyromellitimide","authors":"N.B. Mel'nikova,&nbsp;Ye.G. Kochneva","doi":"10.1016/0032-3950(91)90123-8","DOIUrl":"https://doi.org/10.1016/0032-3950(91)90123-8","url":null,"abstract":"","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 4","pages":"681-688"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90123-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72259042","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
Statistical aspects of the plastic fracture of a filled high-density polyethylene 填充高密度聚乙烯塑性断裂的统计学方面
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90273-S
N.V. Morozova, V.A. Topolkarayev
{"title":"Statistical aspects of the plastic fracture of a filled high-density polyethylene","authors":"N.V. Morozova,&nbsp;V.A. Topolkarayev","doi":"10.1016/0032-3950(91)90273-S","DOIUrl":"10.1016/0032-3950(91)90273-S","url":null,"abstract":"<div><p>The study object was a statistical model of the localized plastic fracture of a filled polymer. With HDPE as an example we studied the extent to which macroscopic breaking deformations of the material are influenced by the filler content and by the uniformity of its distribution in the matrix. Fluctuations in the volume content of filler in the material due to the technology of the composite preparation have a marked effect on the plastic properties of the material. The scale effects of the localized fracture were investigated.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 1","pages":"Pages 79-85"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90273-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77533045","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
Polyelectrolyte properties of tetrazole-containing copolymers 含四氮唑共聚物的聚电解质性质
Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90088-8
V.V. Annenkov, V.A. Kruglova
{"title":"Polyelectrolyte properties of tetrazole-containing copolymers","authors":"V.V. Annenkov,&nbsp;V.A. Kruglova","doi":"10.1016/0032-3950(91)90088-8","DOIUrl":"10.1016/0032-3950(91)90088-8","url":null,"abstract":"<div><p>Potentiometric titration and viscometry have been employed to study the polyelectrolyte properties of NH acid copolymers. The introduction of styrene units into the chain of poly-5-vinyltetrazole disturbs the system of hydrogen bonds characteristics of the polymer at low degrees of ionization. For a large fraction of styrene or 1-vinylpyrrolidone units in the chain of poly-5-vinyltetrazole a significant role in the behaviour of the copolymer is played by hydrophobic interactions. The thermodynamic characteristics of the conformational transition have been determined in the copolymers of 5-isopropenyltetrazolewith styrene and 1-vinylpyrrolidone. In the region of copolymer compositions corresponding to sharp rise in the probability of formation of blocks of styrene units the nature of the forces stabilizing the compact conformation changes—from predominantly hydrogen bonds to hydrophobic interactions. In the copolymers containing 1-vinylpyrrolidone both types of interaction show up, their contribution depending on temperature.</p></div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 10","pages":"Pages 1922-1927"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0032-3950(91)90088-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78119644","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
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