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  • 1
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    Dilatometric study of deformation induced volume increase and recovery in rigid PVC (1988)
    Springer
    Details
    Publication Date: 1988-10-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 2
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    Analysis of a PS/PMMA blend by image processing techniques (1992)
    Springer
    Details
    Publication Date: 1992-04-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 3
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    $Eacute$talonnage du photogoniodiffusom$egrave$tre Sofica; correction en fonction de I'indice de r$eacute$fraction du solvant (1970)
    Institute of Physics
    Details
    Publication Date: 1970-04-01
    Print ISSN: 0022-3727
    Electronic ISSN: 1361-6463
    Topics: Physics
    Published by Institute of Physics
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  • 4
    Electronic Resource
    Electronic Resource
    Dilatometric study of deformation induced volume increase and recovery in rigid PVC (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 913-920 
    Details
    ISSN: 1435-1536
    Keywords: Dilatometry ; volume recovery ; physical aging ; shear deformation ; torsion ; rejuvenation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new torsion dilatometer is presented which allows simultaneous measurement of shear deformation, twisting moment, volume variation and axial deformation (or normal force). It is intended to be utilized principally for studies of volume changes during torsion and recovery behavior of amorphous polymers in their glassy state. Preliminary results on unplasticized PVC are presented which show rather complex volume changes. With increasing torsional strain, a volume decrease at low strains was found, followed by a volume increase for higher strains. In the latter case, after coming back to zero torsion angle, shear induced relative volume increase and subsequent recovery were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410846
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of a PS/PMMA blend by image processing techniques (1992)
    Springer
    Polymer bulletin 28 (1992), S. 235-242 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Concepts of image analysis by mathematical morphology were applied to the characterization of the morphology of an incompatible polymer blend (PS/PMMA) processed on an extruder. The morphologies originated from the breakup of particles according to a Rayleigh mechanism. We tried to estimate the initial length and radius of fibers using a specific particle labelling to check if the Tomotika's relation between the fiber radius and the characteristic length associated with breakup was, in our case, verified. The covariance function's method was also applied. More generally, the contribution of mathematical morphology to polymer morphology characterization was outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299661
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of poly( ε-caprolactam)/polypropylene alloy (1993)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 33 (1993), S. 347-352 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The results of a round-robin testing on the dynamic mechanical properties of a poly(ε-caprolactam)/polypropylene PA-6/PP compatibilized blend (an alloy) are reported. The alloy was a commercial product (Orgalloy R-6000, from Atochem). The samples were prepared by extrusion, injection or compression molding. The greatest difficulty in comparing the data arose from the moisture content since the position of the PA-6 transition peaks depend on the drying conditions. For the extruded specimens only minor effects could be attributed to the anisotropy introduced by the extrusion process. Overall, there was good agreement between the contributing laboratories for the frequency dependence of the transition peaks, but agreement between the measured values of the storage moduli was poor. This discrepancy is suspected to be partially due to the differences in sample geometry and in the processing conditions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760330607
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of VAMAS polycarbonate/polyethylene blends (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 1106-1113 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: As part of the Versailles Project on Advanced Materials and Standards Technical Working Party on Polymer Blends, the dynamic mechanical properties of polycarbonate/linear low density polyethylene (PC/LLDPE) blends were measured. Ten laboratories participated in the round robin tests. As a whole, the inter-laboratory agreement of data is good, particularly when results are obtained using the same apparatus (especially a Rheovibrom DDV-III EA). The results clearly show the nonmiscibility of the parent components. The influence of frequency is also obvious but difficult to characterize because of the narrowness of the frequency range explored. The Takayanagi model applies very well for the calculation of the storage moduli as a function of composition and morphology. The most specific result is probably that of the processing orientation effect: There is no visible influence of flow orientation on dynamic tensile moduli of the parent polymers, but there is a significant difference in the moduli measured in the direction of extrusion and in the transverse direction for the blends at temperatures above 0°C. The difference is greatest for the high PE-concentration blend.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301715
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  • 8
    Electronic Resource
    Electronic Resource
    Diffusion de la lumière par des solutions de molécules en chaînes soumises à un champ électrique (1957)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 199-210 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In order to determine the practical range of study of light scattered by particles in an orientation field, we have established equations relating the variation of scattered light to molecular parameters as a function of the orientation field. We give the first terms of the series expansion of these equations for any particle shape and any orientation field. Then we give the complete expression of the distribution function of light scattered in the case in which the field is electrical and the particles are chain molecules. The results of this theoretical analysis suggests a particularly simple experimental method which characterizes the rigidity of polymer molecules. After a brief description of our apparatus, we report, as an example, the experiments we have carried out with a sample of poly-DL-phenylalanine. In benzene solution, these molecules behave as flexible “random-flight” chains, and from the experimental results it is possible to calculate, among other physical data, the electrical moment of a chain element. From a practical point of view, the choice of an electrical orientation field limits the application to chain molecules which possess an electrical moment. This restriction would no longer hold if a hydrodynamic field were substituted for the electrical field.
    Notes: Dans le but de déterminer la portée pratique de l'étude de la lumière diffusée par des particules soumises à un champ d'orientation, nous avons établi les équations permettant de relier la variation de l'intensité diffusée aux caractéristiques moléculaires en fonction du champ d'orientation. Nous donnons tout d'abord les premiers termes du développement en série de ces équations dans le cas où la forme des particules et la nature du champ d'orientation sont quelconques. Puis, nous donnons l'expression complète de la fonction de répartition de l'intensité lumineuse dans le cas où le champ d'orientation est un champ électrique et où les molécules sont assimilables à des pelotes de Gauss. Les résultats de cette analyse théorique suggèrent une méthode expérimentale simple qui permet de caractériser la rigidité des molécules. Après une brève description de l'appareillage utilisé, nous citons, comme exemple d'applications, les expériences faites sur un échantillon de poly-DL-phénylalanine. En solution dans le benzène ces molécules se comportent comme des chaǐnes de Gauss flexibles. A partir des résultats expérimentaux il est possible de calculer, entre autres grandeurs physiques, la valeur du moment électrique porté par ses chaǐnons. Du point de vue pratique, le choix d'un champ électrique limite les applications aux molécules en chaǐnes porteuses d'un moment électrique. Cette restriction tomberait si l'on remplaçait le champ électrique par un champ hydrodynamique.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1957.1202310319
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  • 9
    Electronic Resource
    Electronic Resource
    Sur certaince propriétes des polymères greffés en solution (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 34 (1959), S. 517-530 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In order to establish the general solubility rules for graft copolymers, a first theory has been proposed from data in the literature and from our own results, a experimental basis is given for a more advanced theory. Two limited cases have been considered; (a) The polymers are perfectly miscible, (b) both polymers are completely incompatible. In case (a) the solubility coefficient of the graft copolymers is an arithmetic means of those of the corresponding homopolymers. In case (b) it is impossible to attribute a solubility coefficient to the graft copolymer, and in some cases, the copolymers with an intermediate degree of grafting should be insoluble. The separation of graft copolymers PVC-PAN, PVC-PMMA, PVC-PAN, and PI-PS from their homopolymers was studied and the results discussed on the basis of this theory. In the case of the graft copolymer PI-PS, although both polymers are incompatible, the difference between the solubility coefficients is sufficiently low so that the behavior of this graft copolymer is analogous to case (a) and it is possible to evaluate the degree of grafting from the limits of precipitation. The experimental results of different authors, related to the solubility of graft copolymers, are discussed.
    Notes: Afin d'établir des régles générales de solubilité des copolymères greffés, nous proposons une ébauche de théorie et nous essayons de dégager, à partir de nos résultats et des données bibliographiques existantes, une base expérimentale pour une théorie plus perfectionnée. Les deux cas limités suivants sont envisagés:(a) Les polymeères sont parfaitement miscibles; (b) les deux polymères sont complètement incompatibles.Dans le cas (a), le coefficient de solubilité des copolymères greffés est une moyenne arithmétique de ceux des homopolyméres correspondants. Dans le cas (b), il est impossible d'attribuer au copolymère greffé un coefficient de solubilité et dans certaines conditions, les copolymères de taux de greffage intermédiaire devraient ětre insolubles. La séparation des copolymères greffés PVC-PAN, PVC-PMMA, PVC-PAN et PI-PS des homopolymères est étudiée et les résultats discutés à la lumière de la théorie cidessus. Dans le cas du copolymère greffé PI-PS, bien que les deux polymères constituants soient incompatibles, l'écart entre les coefficients de solubilité est suffisamment petit pour que son comportement se rapproche du cas (a) et il est possible d'évaluer le taux de greffage à partit des limites de précipitation. Les résultats expérimentaux de différents auteurs, relatifs à la solubilité des copolymères greffé sont également discutés.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203412737
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  • 10
    Electronic Resource
    Electronic Resource
    Die Abhängigkeit der Viskosität von Polymethylmethacrylaten in Lösung vom Geschwindigkeitsgradienten (1954)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 14 (1954), S. 110-114 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Les auteurs ont étudié la dépendance de la viscosité de solutions de polyméthacrylates de méthyle (Mw 〉 106) en fonction du gradient de vitesse. Les measures ont été effectuées aux viscosimètres de Couette et d'Ostwald entre des gradients de 0,246 et 1700 sec-1 et sur des solution dans le chloroforme, le dianxe et l'acétone.
    Notes: Es wird über die Abhängigkeit der Viskosität von Polymethylmethacrylaten in Lösung (Mw 〉 106) vom Geschwindigkeitsgradienten berichtet. Die Messungen wurden im Couette- und im Ostwaldviskosimeter bei Gradienten zwischen 0,246 und 1700 sec-1 in Chloroform, Dioxan und Aceton ausgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1954.020140106
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