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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 12 (1993), S. 1120-1121 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Lineare Polyester (PHB) aus 3-Hydroxybuttersäure und dessen Copolyester (PHBV) mit 3-Hydroxyvaleriansäure werden durch Fermentation von Glucose durch das Bakterium Alcaligenes Eutrophus hergestellt. Ihre wirtschaftliche Nutzung ist derzeit sehr eingeschränkt, bedingt durch die hohen Kosten, einen engen Verarbeitungstemperaturbereich und vor allem wegen ihrer durch die hohe Kristallinität vrursachten geringen Schlagzähigkeit bei Raumtemperatur und darunter sowie eine relativ hohe Glastemperatur.Durch “reactive blending”, d. h. Einpolymerisieren von 30 Gew.-% Butylacrylat, läßt sich PHBV schlagzäh modifizieren. Es besteht ein Zusammenhang zwischen dem mechanischen Verhalten und der Morphologie der Blends.
    Notes: Linear polyesters of 3-hydroxybutyric acid (PHB) and its copolymers with 3-hydroxyvaleric acid (PHBV) are produced by the fermentation of glucose by the bacterium Alcaligenes Eutrophus1,2. Their large-scale commerical development is severely limited, until recently, by the prohibitive cost, narrow processability window (Tdeg-Tm), and, above all, the low impact resistance around room temperature and below due to very high crystallinity and relatively high glass transition temperature.This paper reports on an attractive route to impact modification of PHBV by a reactive blending method. Interesting improvements are obtained by using 30 wt.-% of acrylate rubber. Correlations are found between mechanical response and morphology of blends.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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