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  • Physics  (2)
  • crosslinked polystyrene  (1)
  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Structural evolution of an ABA poly(styrene-b-isoprene) block copolymer with temperature (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 2217-2225 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structural evolution with temperature of an anionically synthesized ABA poly(styrene-b-isoprene) (SIS) lamellar block copolymer (total molecular weight 45,000; isoprene content 38% by weight) was studied by melt-rheological measurements, electron microscopy, and x-ray and light diffraction. Above 225°C, the dynamic viscosity was found to be independent of frequency up to a critical frequency. The variation of the elastic modulus confirmed the occurence of a transition between 215 and 225°C. For the temperature range considered, all results superimposed well on a two-branch master curve. It was concluded that above 225°C, our SIS behaves like a Newtonian material, whereas for lower temperatures and/or higher frequencies classical non-Newtonian behavior is found. The melt-rheological properties were explained by microscopy and diffraction investigations, which allowed us to follow morphological changes as the temperature was raised. It was found that the two-phase lamellar structure is progressively destroyed, and the transition temperature of 225°C corresponds to the temperature above which complete mixing occurs.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180181106
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  • 3
    Electronic Resource
    Electronic Resource
    Glass transition temperatures of ABA poly(styrene-b-isoprene) block copolymers by differential scanning calorimetry (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 20 (1982), S. 389-398 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The glass transition behavior of two sets of ABA poly(styrene-b-isoprene) block copolymers was examined by differential scanning calorimetry. In one series, the triblock copolymers had different total molecular weights and the same (30 wt %) polyisoprene content, in the other, the molecular weight was constant (30,000 g/mol) and the elastomer content was the variable. For all triblock copolymers studied, the data show an inward shift for the glass transition temperatures Tg of the corresponding homopolymers. This shift increases for the rigid-phase Tg as the polystyrene block length decreases. Depending on their molecular characteristics, two, three, or only one Tg were found. The third Tg was interpreted in terms of the existence of an interphase. Some of these conclusions could be confirmed by transmission electron microscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.180200303
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