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  • Articles: DFG German National Licenses  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Glass transition temperature of anionic polyisoprene (1981)
    s.l. : American Chemical Society
    Macromolecules 14 (1981), S. 450-452 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma50003a041
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  • 2
    Electronic Resource
    Electronic Resource
    In situ sequential polyurethane poly(methyl methacrylate) interpenetrating polymer networks: structure and elasticity of polyurethane networks (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 1826-1833 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00194a055
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  • 3
    Electronic Resource
    Electronic Resource
    Stress-strain behavior of thin ABA poly(styrene-b-isoprene) films (1981)
    s.l. : American Chemical Society
    Macromolecules 14 (1981), S. 823-825 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma50004a068
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  • 4
    Electronic Resource
    Electronic Resource
    Phase continuity in sequential poly(n-butyl acrylate)/polystyrene interpenetrating polymer networks (1982)
    s.l. : American Chemical Society
    Macromolecules 15 (1982), S. 625-631 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00230a081
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular-weight dependence of the glass transition temperatures of rigid SIS triblock copolymers studied by DSC (1982)
    Springer
    Journal of thermal analysis and calorimetry 23 (1982), S. 193-199 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung DSC wurden an einer Reihe von ABA Poly(styrol-b-isopren) Dreiblock-Kopolymeren mit 30% Polyisoprengehalt und verschiedenen Molekulargewichten durchgeführt. Die DSC-Daten zeigen eine innere Verschiebung der Glas-Übergangstemperaturen (T g) der Blöcke im Vergleich zu den entsprechenden Homopolymeren. Als Funktion des Molekulargewichts wurden ein bis drei Übergänge gefunden. Die zusätzliche dritteT gerbringt weitere Beweise bezüglich der Existenz einer Interphase zwischen den Mikrodomänen.
    Abstract: Резюме Проведены ДСК-измере ния ряда АБА поли(стирол-Ь-изопрен) трехблочных сополимеров с различ ным молекулярным вес ом и содержащих 30% полиизоп рена. Данные ДСК показали внутрен ний сдвиг температур ы стеклообразования (T g) блочных сополимеров по сравнению с соотве тствующими гомополи мерами. В зависимости от молек улярного веса полимеров было н айдено от одного до тр ех переходов. Наличие до полнительного третьегоТ g перехода служит дальнейшим доказательством сущ ествования какого-ли бо межфазного состояни я между микродоменам и.
    Notes: Abstract Differential scanning calorimetry (DSC) measurements have been carried out on a series of ABA poly(styrene-b-isoprene) triblock copolymers with 30% polyisoprene content and various molecular weights. The DSC data show an inward shift for the glass transition temperatures (T g) of the blocks compared to the corresponding homopolymers. As a function of the molecular weight, one to three transitions were found. The additional thirdT g gives some further evidence of the existence of an interphase between the microdomains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01908501
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  • 6
    Electronic Resource
    Electronic Resource
    Morphologie de Réseaux Polymères Interpénétrés préparés en deux étapes (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 678-684 
    Details
    ISSN: 1435-1536
    Keywords: Interpenetrating polymer network ; crosslinked polystyrene ; domain size ; scanning electron microscopy
    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: Abstract A series of sequential interpenetrating polymer networks, IPN's, of poly(n-butyl acrylate) and polystyrene were prepared. A new equation predicting the domain size in IPN's is summarized and shown to yield agreement with the morphologies observed via scanning electron microscopy. The experimental variables required to determine the domain size include the volume fraction and crosslink level of each polymer, the interfacial tension and the temperature.
    Notes: Résumé Un nouveau modèle thermodynamique prédisant la taille des domaines des réseaux polymères interpénétrés préparés en deux étapes est décrite. Les paramètres influents sont la tension interfaciale et la densité de réticulation des deux polymères, ainsi que la composition. A l'aide de la microscopie électronique à balayage, la théorie a été vérifiée pour le système poly(acrylate den-butyle)/polystyrène.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414653
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of crosslink density and internetwork grafting on the transparency of polyurethane/polystyrene interpenetrating polymer networks (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1467-1473 
    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: Because of their incompatibility and the different refractive indices of the homopolymer components, polyurethane/polystyrene interpenetrating polymer networks are turbid by nature. Different parameters likely to enhance their transparency are examined: the crosslink density of each network and the level of internetwork grafting. The results prove that the latter factor is the most effective, as in some cases, very clear and transparent samples are obtained. Correspondingly, preliminary investigations of the dynamic mechanical properties show an inward shift of the glass transition temperatures for such systems. It is concluded that parameters able to cause a higher degree of phase dispersion can yield transparent materials.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360616
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations for obtaining semi-interpenetrating polymer networks based on monomers of different reactivity toward radicals (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 1183-1188 
    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: Classically, the one-step synthesis of interpenetrating polymer networks (IPNs) and related materials requires noninterfering polymerization modes to achieve distinct networks, held together by only physical entanglements. For the combination of (meth) acrylic and allylic monomers, both polymerizable by free radicals, a new in situ sequential synthesis for obtaining semi-IPNs is proposed. Using specific initiators that decompose at two different temperatures, refractive index measurements, Fourier transform infrared spectroscopy, and dynamic mechanical analysis have shown that neat species are formed and that the two monomers do not copolymerize. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480706
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  • 9
    Electronic Resource
    Electronic Resource
    Adhesive properties of star-shaped block copolymers (1977)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 17 (1977), S. 803-805 
    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: Star-shaped block copolymers were used as heat activated adhesives in glass to glass joints. The branches consisted in either AB or ABA poly(styrene-b-isoprene) block copolymers. Tensile shear strengths of simple lap joints were measured for star block copolymers differing in the length or in the number of branches. Values higher than those of the corresponding linear species were obtained. These results were related to the presence of chemical junction points created by coupling the linear copolymers.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760171108
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  • 10
    Electronic Resource
    Electronic Resource
    A survey of dual phase continuity and miscibility in interpenetrating polymer networks, making use of selective decrosslinking and dissolution of one component: Poly(n-butyl acrylate)/polystyrene (1983)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 23 (1983), S. 693-696 
    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: A sequential interpenetrating polymer network, IPN, may be defined as a combination of two polymers in network form, at least one of which was polymerized or crosslinked in the presence of the other. Two major problems of interest to sequential IPN's relate to phase continuity and extent of mixing within each phase. A first attempt to define the molar volume of a network is made in terms of the molar volume of the polymer between crosslinks. This permits a thermodynamic calculation of the changes in molecular mixing expected as a function of crosslink density. The experimental system was poly(n-butyl acrylate)/polystyrene IPN's, where the PnBA was crosslinked with acrylic acid anhydride. This last may be selectively hydrolyzed, forming a semi-IPN, and then the PnBA can be extracted. Scanning electron microscopy and dynamic mechanical spectroscopy were carried out at each stage.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760231210
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