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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 3002-3005 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 7389-7391 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 6568-6573 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 1505-1510 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    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: Summary Kinetics of the intramolecular photodimerization reaction of a molecular probe, 9-(hydroxymethyl)-10-[(Naphthylmethoxy)-methyl] anthracene (HNMA) was studied in the miscible region of binary polymer mixtures. Poly(ethylene oxide)/poly(methyl methacrylate)(PEO/PMMA), polystyrene/poly(vinyl methyl ether) (PSH/PVME) and deuterated polystyrene/poly(vinyl methyl ether) (PSD/PVME) mixtures were used as binary polymer blends. It was found that the reaction kinetics is strongly affected by the concentration fluctuations in the vicinity of the coexistence curve. These behavior are consistent with the magnitude of the binary interaction parameters X estimated from the small-angle neutron-scattering and the melting point depression data. These experimental results confirm the fact that the reaction kinetics of HNMA reflects the concentration fluctuations with the wavelength comparable to the dimension of the probe.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 250 (1972), S. 394-403 
    ISSN: 1435-1536
    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: Summary The domain structures of film specimens cast from benzene solutions of a series of graft copolymer of poly(methyl acrylate) with styrene with different degrees of grafting, from 10 to 80 vol% of styrene component, were investigated with phase-contrast and dye-staining microscopy. The graft copolymers were synthesized by coupling polystyryllithium, obtained by anionic polymerization technique, onto a well-fractionated PMA, so that the coupling density of the grafted segment along the backbone segment was varied but the molecular weights of the grafted and backbone segments were kept constant to cover the above range of volume fraction of styrene component for the series of graft copolymer. It was found that with an increase of the volume fraction of styrene component (grafted segment) the domain structure changes from spheres of styrene component dispersed in a matrix of MA component, to alternating lamellae of the two components, and to spheres of MA component dispersed in a matrix of styrene component. Two types of rodlike domains, usually found for block copolymers as the intermediates between the spherical and lamellar domains, were missed. The domain formation mechanism was discussed in terms of a quasi-equilibrium phenomenon of micelle formation, microphase separation between the grafted and backbone segments, at a critical micelle concentration. TheGibbs free energies of five types of micelle formations; anA sphere in aB shell micelle, anA rod in aB sheath micelle, alternating lamellar micelle ofA andB, aB rod in anA sheath, and aB sphere in anA shell micelle, were discussed in terms of molecular and thermodynamic parameters. Comparing the free energy levels of the five types of micelle formations with each other, it was revealed that the free energy levels for forming the two types of rodlike micelles can not be the lowest at any volume fraction of grafted segment.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 250 (1972), S. 459-470 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die viskoelastischen Eigenschaften einer Reihe von Pfropf-Kopolymeren von Polymethylacrylat mit Styrol, die sich im Grad der Pfropfung und damit folgerichtig in der heterogenen Struktur unterscheiden, wurden mit der mechanischen Relaxation im Bereich von Glas-bis zum Gummi-Verhalten untersucht. Das Relaxationsverhalten der entsprechenden Homopolymeren war zuvor in Form von 4 verschiedenen Relaxationsmechanismen festgelegt worden; lokalisierte Relaxation verknüpft mit dem sek. Glasübergang, zwei Arten von intramolekularer Relaxation entsprechend kooperativer thermischer Diffusion von Kettensegmenten im Kurz- und Langbereich, beide verknüpft mit dem prim. Glas-Gummi-Übergang und zwischen-molekularer Relaxation, ebenfalls aufgrund kooperativer thermischer Bewegung von Kettensegmenten, aber über weite Bereiche einschl. der sog. Kettenverhakungen. Das Relaxationsverhalten des heterogenen Systems der Pfropf-Kopolymeren wurde auf Grundlage einer homogenen Spannung sowohl für das System als für die 4 verschiedenen Relaxationsmechanismen der bei-den Komponenten analysiert. Es traten zwei Typen von zusätzlichen Relaxations-mechanismen auf, die mit Grenzflächenphänomenen und mit dem Fließen ganzer Pfropfketten (Abbau) in Domänen-Strukturen zusammenhängen, sie wurden als charakteristisch für das System betrachtet.
    Notes: Summary The viscoelastic properties of a series of graft copolymers of poly(methyl acrylate) with styrene differing in the degree of grafting and, consequently, in the heterogeneous structure, were investigated in terms of the relaxation modulus function in a range from glassy to rubber flow consistencies. The relaxation behavior of the corresponding homopolymers was first analyzed in terms of the four different relaxation mechanisms; localized relaxation mechanism associated with the secondary glass transition, two types of intra-molecular relaxation mechanisms due to cooperative thermal diffusion of chain segments in short and long ranges, respectively, both associated with the primary glass-rubber transition, and inter-molecular relaxation mechanisms due to also the cooperative thermal diffusion of chain segments but in further long range including the so-called chain entanglements. The relaxation behavior of the heterogeneous system of the graft copolymers was then analyzed on the bases of the homogeneous strain hypothesis for the system as well as of the four different relaxation mechanisms for both of the two components. Two types of additional relaxation mechanisms associated with the grain boundary phenomena and with the flow of entire graft copolymer chains after melting (disintegration) of the domain structures, respectively, were investigated as characteristics of the system.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 33 (1993), S. 772-780 
    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 morphology developing during the spinodal decomposition process of polystyrene (PS)/poly(vinyl methyl ether) (PVME) blends was successfully controlled by photo-crosslink reactions between PS chains. The crosslink reaction was carried out by taking advantage of the photodimerization of anthracene moieties that are labeled on PS chains. Effects of photo-crosslinks on the morphology induced by temperature jumps (T-jump) from the one-phase region into the spinodal region were examined under several experimental conditions such as T-jump depths and irradiation times. It was found that the concentration fluctuations developing during the spinodal decomposition process were efficiently frozen upon irradiation using a XeF excimer laser as well as a mercury (Hg) lamp. Furthermore, these ordered structures are quite stable upon annealing. These results demonstrate that the morphology developing during the spinodal decomposition process can be well controlled by easily accessible light sources such as high pressure mercury lamps. Thus the photo-crosslink reaction described in this work can provide the basis for a potential technique to design multiphase polymer materials with controllable ordered structures.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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