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  • 1
    Electronic Resource
    Electronic Resource
    Multiple phase transitions in block copolymers (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 6 (1984), S. 93-106 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A structon model of supercrystals for describing the dynamic properties and multiple phese transitions of superlattices, formed in systems of block copolymers with segregated domains, is applied and experimentally substantiated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.020061984108
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  • 2
    Electronic Resource
    Electronic Resource
    Interpolymer complex formation of some nonionogenic polymers with linear and crosslinked polyacrylic acid (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 281-284 
    Details
    ISSN: 0887-624X
    Keywords: interpolymer complex ; viscometric method ; polyelectrolyte ; hvdrogel ; hydrogel degree of swelling ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation of interpolymer complexes on the surface of crosslinked poly (acrylic acid) with some nonionogenic polymers is compared with the complex formation in analogous linear polymer systems. The behavior of these systems is compared with that of complexes of two oppositely charged polyelectrolytes. The concentration redistribution of the linear polymer in the system polyelectrolyte network-polymer solution and the degree of swelling of this network in these solutions were determined. © 1994 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320208
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  • 3
    Electronic Resource
    Electronic Resource
    Rheological properties of highly swollen hydrogel suspensions (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 721-726 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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 shear rheology of diluted to concentrated suspensions of weakly cross-linked sodium polyacrylate hydrogels were investigated by concentric cylinder rheometry. The size of the swollen gel particles is dependent on the initial size of the dry particle and on the nature of the added salt. Polyvalent salts are more efficient for contracting the swollen particles than monovalent ones. When suspended in water or in monovalent salt solutions, the viscosity at low concentrations shows a behaviour very similar to the one of flexible polymer solutions. Below the critical overlap concentration, the viscosity is independent of shear rate. The intrinsic viscosity is very large, on the order of 10-15 dL/g. This is in agreement with the large size of these swollen particles. Suspensions of such swollen gel particles are thus a good model for extremely high molecular weight polymer solutions. In polyvalent salt solutions different behaviour of the viscosity curves versus concentration was observed. This effect is caused by chemical cross-linking of the hydrogel by polyvalent ions. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070520601
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  • 4
    Electronic Resource
    Electronic Resource
    Diffusion of fibroblast growth factor from a plaster of paris carrier (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 4 (1993), S. 67-72 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Fibroblast growth factor (FGF) is a polypeptide that has been shown to have a stimulatory effect on osseous tissues in vitro. This study characterized the release of FGF from plaster of Paris (PLP) and measured the dissolution of PLP in various solutions with the aim of developing a reliable carrier system for the release of FGF in vivo. The study consisted of five experiments: (I) FGF diffusion from PLP pellets, (II) FGF diffusion from PLP discs, (III) PLP dissolution in saline, (IV) PLP dissolution in serum, and (V) FGF adsorption by commercially pure titanium. FGF was observed to be released at a rate directly proportional to the rate of dissolution of the PLP carrier, suggesting that either the FGF binds to the PLP; or, alternatively, the FGF may be entrapped by the PLP. Dissolution rate, and thus release rate, could be varied by varying the mass of the carrier. Greater diffusion of FGF was observed in larger, more slowly dissolving PLP carriers. Dissolution of PLP was observed to be slower in serum than in saline, apparently due to stabilization by factors in the serum but not due to a concentration gradient effect. Titanium coupons did not adsorb significant amounts of FGF. These results indicate that PLP, which has been shown in the past neither to FGF. These results indicate that PLP, which has been shown in the past neither to aggravate inflammatory response nor to interfere with bone ingrowth, may serve as delivery vehicle for FGF to osseous tissues in vivo. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770040109
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  • 5
    Electronic Resource
    Electronic Resource
    Development of a novel osteochondral graft for cartilage repair (1998)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 41 (1998), S. 244-250 
    Details
    ISSN: 0021-9304
    Keywords: cartilage repair ; osteochondral graft ; chondrocyte transplantation ; articular cartilage defects ; animal model ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This study reports the development of a novel osteochondral graft for cartilage repair. A technique of proteoglycan extraction via timed enzymatic digestion with hyaluronidase and trypsin and subsequent processing with a chloroform-methanol solution to remove cellular debris from a fresh-frozen bovine osteochondral sample is a method described to prepare a stable biological carrier of low immunogenicity. Lyophilization of the carrier followed by rehydration in a suspension of lapine chondrocytes produced a chimeric xenograft that succeeded in vivo in enhancing cartilage repair. In a pilot study, full-thickness articular cartilage defects treated with these xenografts demonstrated improved healing compared to untreated defects or defects treated with unseeded grafts at 2, 6, and 12 weeks postimplantation. The xenograft provoked a mild inflammatory response; however this did not impede the repair process. Further investigation of this novel chimeric xenograft eventually may yield a method of cartilage repair superior to current methods of treatment. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 41, 244-250, 1998.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Superorientierung von superhochmolekularem ataktischem Polystyrol in binären Schmelzen (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 456-458 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Based on data obtained with homodisperse super high molecular polystyrene samples of Mv≧107 the possibility of applying binary melts of this polymer and comparatively low molecular components in the preparation of metastable supernematic systems having high strength is demonstrated. The formation of these systems proceeds by a thermokinetic mechanism, being analogous to the transformation of a jet to a filament in a solution under stress. The impossibility of separating the low molecular component and the segregation of the high molecular component result in distinct formation of fibrils. The tensile strength of the supernematic system based on super high molecular polystyrene amounts to 1.5·103 MPa at the temperature of liquid nitrogen. At room temperature the systems of this kind may aquire constraint elasticity. The principal analogy of formation of a nematic and a supernematic phase from a system containing super high molecular polystyrene to the orientation crystallization process and to the Judin effect is demonstrated.
    Notes: Ausgehend von den für praktisch homodisperse superhochmolekulare Polystyrolproben mit Mv≧107 erhaltenen Daten wird die Möglichkeit der Anwendung binärer Schmelzen eines derartigen Polymers mit relativ niedermolekularen Komponenten zur Herstellung hochfester metastabiler supernematischer Systeme aufgezeigt. Die Bildung dieser Systeme verläuft nach einem thermokinetischen Mechanismus, der dem Übergang vom Strahl zum Faden in einer zugbeanspruchten Lösung analog ist. Die Unmöglichkeit der makroskopischen Ausscheidung der niedermolekularen Phase und die Segregation der hochmolekularen Phase führen zu einer ausgeprägten Fibrillenbildung. Die Reißfestigkeit des supernematischen Systems auf der Basis von superhochmolekularem Polystyrol erreicht bei der Temperatur von flüssigem Stickstoff 1,5·103 MPa, während derartige Systeme bei Zimmertemperatur ein zwangselastisches Verhalten zeigen können. Dargelegt wird die prinzipielle Analogie der Bildung einer nematischen und supernematischen Phase aus superhochmolekulares Polystyrol enthaltenden Systemen zur Orientierungskristallisation und zum Auftreten des Judin-Effektes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310712
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  • 7
    Electronic Resource
    Electronic Resource
    Einfluß der topologischen copolymerisationsbedingungen auf die molekulare und chemische uneinhitlichkeit der copolymere von styren und acrylnitril (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 577-583 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The molecular parameters and the inhomogeneity of composition of styrene-acrylonitrile copolymers obtained by polymerization initiated by AIBN and thermal polymerization in bulk and precipitation agents were determined by sedimentation velocity, thin layer chromatography and viscosimetry. The dependence of molecular weight distribution on conversion was investigated by statistical methods based on comparing the differential distribution curves.
    Notes: Die molekularen Parameter und die Uneinheitlichkeit der Zusammensetzung der mit AIBN initiierten und der thermischen Polymerisation in Masse und im Fällungsmittel hergestellten Styren-Acrylnitril-Copolymere wurden mittels Geschwindigkeitssedimentation, Dünnschichtchromatographie und Viskosimetrie bestimmt. Für die Untersuchung der Ánderungen der Molmassenverteilungsfunktion mit dem Umsatz wurde eine auf Vergleich von differentiellen Verteilungskurven gegründete statistische Methode angewandt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331004
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  • 8
    Electronic Resource
    Electronic Resource
    Pecularities of thermal motion in block copolymeric supercrystalsLecture presented on the 12th Europhysics Conference on Macromolecular Physics “Molecular Mobility in Polymer Systems”, September 21-26, 1981, in Leipzig/GDR (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 421-426 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Entstehung und Schmelzen einer Übergitterstruktur in homodispersen Styren-Butadien-Blockopolymeren wurde mit der Kleinwinkelneutronenstreuung untersucht. Das Übergitter dieser Copolymere wird durch hexagonal angeordnete Polystyrenzylinder gebildet. In Übereinstimmung mit früheren Voraussagen tritt in dem Übergitter keine thermische Ausdehnung senkrecht zu den Zylinderachsen auf. Die Überstruktur schmilzt nur bei gleichzeitiger Quellung und Erwärmung der Probe. Die Ergebnisse werden mittels des von Frenkel vorgeschlagenen Struktonmodells diskutiert.
    Notes: Formation and melting of superlattices in homodisperse styrene - butadiene block copolymers are investigated by small angle neutron scattering. The superlattice of the investigated copolymers is formed by hexagonally packed polystyrene cylinders. In accord with earlier predictions the superlattice does not expand thermally in the direction transverse to that of the cylinder axes. Melting of the superstructure can be observed only on combination of swelling with thermal treatment. The results are readily interpreted in terms of the struction model advanced by Frenkel. Some general features of the structon model are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330704
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  • 9
    Electronic Resource
    Electronic Resource
    Solution of problems of analytical fractionation of polymers and copolymers by using a generalized material balance equation (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 237-237 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340413
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  • 10
    Electronic Resource
    Electronic Resource
    Peculiarities of the deformational behaviour of cellulose diacetate films in “active” fluids (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 381-384 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das rheologische Verhalten von Cellulosediacetat-Filmen, die in Ethanol vororientiert worden waren, wurde bei konstanter Spannung sowie bei konstanter Last im Temperaturbereich von 40 bis 60°C untersucht. Aus einer Analyse der Fließkurven folgt, daß die beobachteten Effekte durch eine „negative longitudinale Viskosität“ erklärt werden können. Die innere Ursache dieser Erscheinung hängt wahrscheinlich mit dem Auftreten einer Mesophase in dem Material zusammen. Eine Methode zur Bestimmung der „negativen longitudinalen Viskosität“ wird vorgeschlagen.
    Notes: The rheological behaviour of cellulose diacetate films preliminarily oriented in ethanol has been studied under conditions of constant stress and constant load in the range of temperatures from 40 to 60°C. The analysis of the flow curves shows that the observed effects can be explained in terms of “a negative longitudinal viscosity”. This is probably caused by the occurence of a mesophase in the material. A method for measuring of “the negative longitudinal viscosity” is proposed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340701
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