Synthese und charakterisierung von butadien/ethen/propen terpolymeren

Abstract

Butadiene/ethene/propene terpolymers are synthesized by Ziegler-Natta polymerization with the catalyst system VO(O-neopentyl)2C1/Al(i-Bu)3 in toluene at -10 "C. Variation of the amounts of propene and ethene leads to products with propene contents between 5 and 30 mol-% (referring to monomeric unit) in the polymer. These polymers are terpolymers with alternating units of butadiene-ethene and butadiene-propene sequences as shown by means of nuclear magnetic resonance investigations. The degree of crystallinity can be varied between 10 and 51 mol-% by different incorporation of propene into the terpolymer (X-ray diffraction). The thermal behaviour was characterized using differential scanning calorimetry investigations. Depending on the propene content in the terpolymer the degree of crystallinity significantly influences the parameters of glass transition and the melting process.

Metallocene-catalyzed ethene/styrene co- and terpolymerization with olefinic termonomers

“…Furthermore, terpolymers including Terpolymerization of olefins using metallocene catalysts, [1][2][3][4][5] supported Ziegler-Natta catalysts, 6 longer aliphatic 1-olefins or block-terpolymers served as model compounds for LLDPE. 5,8 Howor vanadium complexes 7 has been reported by several authors. Different monomers have been ever, with these catalytic systems it was not possiused in terpolymerization with ethene and proble to incorporate vinylaromatic comonomers.…”

DSC-Untersuchungen an Butadien/olefin-CO- und Terpolymeren sowie an ihren Hydrierprodukten

“…Die alternierenden Co-und Terpolymere wurden durch L6sungspolymerisa-tion in Toluen unter Verwendung des Katalysatorsystems VO(ONeo)zC1/Al(isoButyl)3 (Neo=neopentyl; 2,2-dimethylpropyl) bei tiefen Temperaturen hergestellt [1,2,5,6]. Die Hydrierung dieser Produkte wurde in p-Xylen bei 134-140~ mit p-Toluensulfonylhydrazid/Tri-n-propylamin durchgefiihrt [5][6].…”

“…Diese liegen allerdings unterhalb der Raumtemperatur. In [2,3] wurde dar/iber ausffihrlich berichtet. ,~hn-lich wie bei den alternierenden Copolymeren mit l~ingerer Seitenkette erfolgte im Anschlu6 an den Glasiibergang der schnell abgekfihlten Proben eine exotherme Rekristallisation, die in einen sofort folgenden Schmelzvorgang fibergeht.…”