Polymer Science U.s.s.r.最新文献_第6页

Kinetic characteristics of chain propagation and transfer to aluminium alkyl in the high temperature polymerization of ethylene on Ziegler-type titanium-magnesium catalysts ziegler型钛镁催化剂催化乙烯高温聚合时链扩展和转移到烷基铝的动力学特征

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90222-C

A.A. Baulin, V.M. Kopylov

引用次数: 0

On the structure and properties of chitosan sulphate 硫酸壳聚糖的结构与性能研究

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90013-G

I.N. Gorbacheva, Ye.Ye. Skorikova, G.A. Vikhoreva, L.S. Gal'braikh, K.K. Babiyevskii

引用次数: 2

Phase segregation in diethylene glycol (adipate-terephthalate) co-oligomers 二甘醇(己二酸酯-对苯二甲酸酯)共低聚物的相分离

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90023-J

A.T. Gubaidullin, B.Ya. Teitel'Baum, N.P. Apukhtina, S.M. Yakzhina, T.A. Yagfarova

引用次数: 1

Hydrodynamic behabiour of cellulose triacetate in solution and structure of the interface 三醋酸纤维素在溶液中的水动力行为及界面结构

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90218-F

A.N. Krasovskii , D.N. Polyakov , V.G. Baranov , S.S. Mnatsakanov , A.V. Varlamov

{"title":"Hydrodynamic behabiour of cellulose triacetate in solution and structure of the interface","authors":"A.N. Krasovskii , D.N. Polyakov , V.G. Baranov , S.S. Mnatsakanov , A.V. Varlamov","doi":"10.1016/0032-3950(91)90218-F","DOIUrl":"10.1016/0032-3950(91)90218-F","url":null,"abstract":"<div>Expressions relating the relative viscosity ηrel of cellulose triacetate (CTA) in solution to the degree of filling of the hydrodynamic volume [η]0c have been used to determine the concentration dependences of ηrel for CTA solutions (n = 300; 95) in CHCl3. In addition, the IR absorption spectra of dilute and of moderately concentrated CTA solutions were investigated, as well as the reflection spectra of the boundary layers pertaining to the CTA solution-solid interface. It is shown that a sharp increase in the amount of CTA mesophase in the volume of the solution at levels of [η]0c⩾7 is due to the existence of a critical effective volume occupied by CTA macromolecules. When this limit is exceeded, the result is that polymer-oolymer contacts predominate over polymer-solvent ones. The transition from solution volume phase to CTA boundary layers leads, at [η]0c>2, to a significant increase in the amount of CTA mesophase. It was found that at [η]0c<1 the boundary layer CTA macromolecules retain a high degree of orientational order under the action of the carrier field, and their arrangement is such that the major axis is directed perpendicular to the interface; moreover the orientational parameter of the boundary layer macromolecules corresponds to nematic LC phase.</div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 6","pages":"Pages 1132-1137"},"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)90218-F","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73073838","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

Change of properties of a densely crosslinked polymer induced by solid-phase deformation and annealing 固相变形和退火引起的密集交联聚合物的性能变化

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90109-4

A.A. Askadskii, V.A. Beloshenko, M.K. Pakter, K.A. Bychko, M.P. Valetskii

引用次数: 0

Determination of polymer compressibility over a broad temperature interval by dilatometry 用膨胀法测定聚合物在宽温度范围内的压缩性

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90146-H

V.S. Batalov

引用次数: 0

Equilibrium in the polycaproamide-caprolactam-water system below the melting point of the polymer modified by addition of hexamethylene adipamide 在加入己二胺修饰的聚合物熔点以下的聚酰胺-己内酰胺-水体系中的平衡

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90152-G

L.N. Mizerovskii, D.L. Signalov, V.G. Silant'eva, Ye.S. Artsis

引用次数: 0

Acoustic spectra of some polypropylene glycols. mechanism of structural relaxation 某些聚丙烯二醇的声谱。结构松弛机理

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90208-8

A.A. Chuiko, V.S. Sperkach, V.M. Ogenko, T.P. Tantsyura, L.N. Ganyuk, L.V. Dubrovina, B.T. Yeleyusinov

引用次数: 1

Structure and properties of water-soluble protein derivatives and hydrophilic polymers 水溶性蛋白质衍生物和亲水聚合物的结构和性质

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90272-R

L.I. Valuyev , V.V. Chupov , T.A. Valuyeva , L.V. Vanchugova , V.A. Sinani , O.V. Noah , N.A. Platé

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引用次数: 0

A method for quantitative determination of defects in polymer layers by X-ray microanalysis and scanning electron microscopy 用x射线显微分析和扫描电子显微镜定量测定聚合物层中缺陷的方法

Polymer Science U.s.s.r. Pub Date : 1991-01-01 Epub Date: 2003-06-11 DOI: 10.1016/0032-3950(91)90057-W

I.N. Sapozhnikova, A.Ye. Chalykh

{"title":"A method for quantitative determination of defects in polymer layers by X-ray microanalysis and scanning electron microscopy","authors":"I.N. Sapozhnikova, A.Ye. Chalykh","doi":"10.1016/0032-3950(91)90057-W","DOIUrl":"10.1016/0032-3950(91)90057-W","url":null,"abstract":"<div>A universal, rapid and based on scanning electron microscopy and X-ray microanalysis has been developed for determining quantitatively the defectiveness of polymeric surface coatings. The method makes use of the fact that defects, regardless of their type (concentration fluctuations, dispersed inclusions, form defects, etc.) can be considered as compositional defects, each in its own scale, and can be evaluated from the induced change in intensity of a characteristic X-ray radiation of defects containing a surface element as compared to an element without defects. Two alternatives are proposed for evaluating the defects—either from their total number (Ds) or according to defect type (Dl). The quantity Ds can be estimated by measuring the intensity of X-ray radiation in different scales: by varying the magnification in the scanning electron microscopy of the defect-containing surface area and, on the other hand, at the “point” of a defectless surface. The parameter Dl is determined by comparing the intensities of X-ray radiation from the respective “points” in the defective and defectless areas of the investigated surface. The method was checked on heterogeneous, layered filled systems similar to those used in the magnetic hard disks. The results enabled us to devise defectograms of ferromagnetic layers of magnetic memory devices (disks). By using the defects as a negative property we were able to deduce a generalized dependence property-composition.</div>","PeriodicalId":20280,"journal":{"name":"Polymer Science U.s.s.r.","volume":"33 8","pages":"Pages 1677-1685"},"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)90057-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112732152","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