Methyl rubber

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Structural formula
Structure of methyl rubber
General
Surname Methyl rubber
other names

Poly (2,3-dimethylbutadiene)

CAS number 25034-65-5
Monomer 2,3-dimethyl-1,3-butadiene
Molecular formula of the repeating unit C 6 H 10
Molar mass of the repeating unit 82.1 g mol −1
properties
Physical state

firmly

safety instructions
GHS labeling of hazardous substances
no classification available
H and P phrases H: see above
P: see above
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Methyl rubber is a polymer made from 2,3-dimethylbutadiene (methyl isoprene), the industrial production of which was developed by Fritz Hofmann in 1910 . Ivan Lavrentjewitsch Kondakov had already discovered the connection without realizing its meaning.

Although the synthesis of methyl rubber turned out to be unprofitable compared to natural rubber , it was manufactured by the Bayer paint factories (Leverkusen) during the First World War , as the German Empire was cut off from natural rubber imports. Since 1912, they have been manufactured from dimethylbutadiene in months of polymerization at 30 or 70 ° C under pressure. During the First World War, the plants produced around 2,400 tons. The methyl rubber has acceptable hard rubber properties but poor soft rubber properties. Due to these poor properties, production was discontinued after the First World War. Artificial rubber was made by the important Buna process in the early 1930s .

The monomer, 2,3-dimethylbutadiene

Individual evidence

  1. This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
  2. Biographies of pioneers in plastics technology - Fritz Hofmann .
  3. ^ I. Franta: Elastomers and Rubber Compounding Materials . Elsevier, 2012, ISBN 978-0-444-60118-6 , pp. 65 ( limited preview in Google Book search).
  4. ^ Roland Burgard: plastics and free forms. A work book . Springer, Vienna 2004; ISBN 3-211-21077-6 ; P. 20.
  5. Rubber ( Memento of the original from December 11, 2013 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . @1@ 2Template: Webachiv / IABot / www.erfinderland-rlp.de
  6. Susanne Heim: Calories, Rubber, Careers. Plant breeding and agricultural research in Kaiser Wilhelm Institutes from 1933 to 1945 . Wallstein Verlag 2003; ISBN 3-89244-696-2 , p. 128.
  7. ^ Kunststoff Lexikon, Carl Hanser Verlag Munich Vienna, 8th updated and expanded edition, 1992.