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  • 1
    Electronic Resource
    Electronic Resource
    Toughening isotactic polypropylene and propylene-ethylene block copolymer with styrene-ethylene butylene-styrene triblock copolymer (1995)
    Springer
    Journal of polymer research 2 (1995), S. 21-29 
    Details
    ISSN: 1572-8935
    Keywords: Blend ; Polypropylene ; Toughening ; Propylene-ethylene block copolymer ; Styrene-ethylene butylene-styrene (SEBS)
    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 Dynamic mechanical properties, low-temperature impact behavior, flexural modulus and heat distortion temperature (HDT) of isotactic polypropylene (i-PP) and propylene-ethylene block copolymer (Co-PP) toughened with styrene-ethylene butylene-styrene triblock copolymer (SEBS), at blending ratios of 0–30 phr, were studied and compared. A scanning electron microscopic morphology study of the impact-fractured surfaces demonstrated the changes in fracture mechanisms at various temperatures and SEBS contents. SEBS remarkably improves the impact endurance in the lower-temperature range when blended with Co-PP in comparison with i-PP, due to the increased compatibility in the interface between SEBS particles and the Co-PP matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493430
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of flexible polyarylate by interfacial polycondensation (1994)
    Springer
    Journal of polymer research 1 (1994), S. 1-6 
    Details
    ISSN: 1572-8935
    Keywords: Polyarylate ; Bisphenol-A ; Terephthalic acid ; Ethylene glycol ; Interfacial polycondensation
    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 Products with hydroxyl ends were synthesized from the esterification of bisphenol-A, terephthalic acid and ethylene glycol. These ester products were then used for synthesis of polyarylate by interfacial polycondensation. Not only the relative concentrations of reactants for esterification but also the conditions for interfacial polycondensation, such as the monomer ratio between two phases and the reaction time, play significant roles in affecting the properties of final products. Under proper synthesis conditions, the polyarylate formed could possess equivalent thermal characteristics and much higher impact strength in comparison with unmodified polyarylate due to the incorporation of flexible aliphatic segments from ethylene glycol. X-ray diffraction showed the existence of aliphatic segments would induce small degree of orderly alignment locally in structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378588
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