Ziegler , Karl
(1898–1973) German chemist
Ziegler was born at Helsa in Germany, the son of a minister. He received his doctorate from the University of Marburg in 1923 and then taught at Frankfurt, Heidelberg, and Halle before becoming director of the Max Planck Institute for Coal Research in 1943. In 1963 he was awarded the Nobel Prize for chemistry with Giulio Natta for their discovery of Ziegler–Natta catalysts.
One of the earliest plastics, polyethylene, was simply made by polymerization of the ethylene molecule into long chains containing over a thousand ethylene units. In practice, however, the integrity of the chain tended to be ruined by the development of branches weakening the plastic and endowing it with a melting point only slightly above the boiling point of water.
In 1953 Ziegler introduced a family of catalysts that prevented such branching and produced a much stronger plastic, one which could be soaked in hot water without softening. The catalysts are mixtures of organometallic compounds containing such metallic ions as titanium and aluminum. The new process had the additional advantage that it requires much lower temperatures and pressures than the old method.

Scientists. . 2011.

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  • Ziegler, Karl — born Nov. 26, 1898, Helsa, near Kassel, Ger. died Aug. 12, 1973, Mülheim, W.Ger. German chemist. He held academic appointments at the Universities of Frankfurt am Main, Heidelberg, and Halle, and in 1943 he became director of the Kaiser Wilhelm… …   Universalium

  • Ziegler, Karl — ► (1898 1973) Químico alemán. Fue premio Nobel de Química en 1963, compartido con G. Natta, por la invención de un proceso de obtención del polietileno utilizando un catalizador específico descubierto por él. * * * (26 nov. 1898, Helsa, cerca de… …   Enciclopedia Universal

  • Ziegler,Karl Waldemar — Zie·gler (zēʹglər, tsēʹ ), Karl Waldemar. 1898 1973. German chemist. He shared a 1963 Nobel Prize for research on polymers. * * * …   Universalium

  • Ziegler — Karl …   Scientists

  • Ziegler — Ziegler, Karl …   Enciclopedia Universal

  • ZIEGLER (K. W.) — ZIEGLER KARL WALDEMAR (1898 1973) Chimiste allemand lauréat né à Helsa, près de Kassel, et mort à Mülheim an der Ruhr. Karl Waldemar Ziegler partagea avec Giulio Natta, du prix Nobel de chimie (1963) pour leurs recherches sur l’amélioration des… …   Encyclopédie Universelle

  • Karl Ziegler — Infobox Scientist name = Karl Waldemar Ziegler image width = caption = Karl Ziegler birth date = November 26, 1898 birth place = Helsa near Kassel, Germany nationality = Germany death date = death date and age|1973|8|12|1898|11|26 death place =… …   Wikipedia

  • Ziegler-Katalysator — Mit Ziegler Natta Verfahren (früher auch Mülheimer Prozess) bezeichnet man ein Verfahren zur Herstellung von Polyolefinen über koordinative Insertionspolymerisation mit metallorganischen Katalysatoren. Dieses Verfahren findet technische Anwendung …   Deutsch Wikipedia

  • Ziegler-Natta-Katalysator — Mit Ziegler Natta Verfahren (früher auch Mülheimer Prozess) bezeichnet man ein Verfahren zur Herstellung von Polyolefinen über koordinative Insertionspolymerisation mit metallorganischen Katalysatoren. Dieses Verfahren findet technische Anwendung …   Deutsch Wikipedia

  • Ziegler-Natta-Katalyse — Mit Ziegler Natta Verfahren (früher auch Mülheimer Prozess) bezeichnet man ein Verfahren zur Herstellung von Polyolefinen über koordinative Insertionspolymerisation mit metallorganischen Katalysatoren. Dieses Verfahren findet technische Anwendung …   Deutsch Wikipedia

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