What did Hermann Staudinger discover?
What did Hermann Staudinger discover?
Hermann Staudinger (German pronunciation: [ˈhɛʁman ˈʃtaʊ̯dɪŋɐ] ( listen); 23 March 1881 – 8 September 1965) was a German organic chemist who demonstrated the existence of macromolecules, which he characterized as polymers. For this work he received the 1953 Nobel Prize in Chemistry.
What is Staudinger ligation?
The Staudinger ligation is used to site-specifically incorporate organic molecules (such as fluorescent dyes) into recombinant polypeptides containing unnatural azide-conjugated amino acids (incorporated, for instance, via suppression of the amber stop codon: https://pubs.acs.org/doi/pdf/10.1021/ja027007w)
Who is the father of polymers?
Herman Francis Mark, (born May 3, 1895, Vienna, Austria—died April 6, 1992, Austin, Texas, U.S.), Austrian American chemist who, although not the world’s first polymer chemist, was known as the father of polymer science because of his many contributions to polymer science education and research.
Who discovered polymerisation?
A century on from his groundbreaking paper on polymerization, Advanced Science News takes a look at the life and work of Nobel Laureate, Hermann Staudinger. One hundred years ago this month marked the beginning of a revolution in chemistry and materials technology.
Who discovered plastic?
Belgian chemist and clever marketeer Leo Baekeland pioneered the first fully synthetic plastic in 1907. He beat his Scottish rival, James Swinburne, to the patent office by one day. His invention, which he would christen Bakelite, combined two chemicals, formaldehyde and phenol, under heat and pressure.
Who discovered polyethylene?
The first patents for polythene were registered in 1936 by Imperial Chemical Industries. A year later the first practical use for the material, as a film, was discovered. In 1953 Karl Ziegler of the Kaiser Wilhelm Institute and Erhard Holzkamp invented HDPE (High Density Polyethylene).
What is aza Wittig reaction?
Aza-Wittig reactions are similar to Wittig reactions in that they also involve the reaction of a phosphonium ylide, in this case an iminophosphorane (or phosphinimide) such as 39, with a carbonyl group containing compound to form the carbon–nitrogen double bond of an imine along with a byproduct phosphine oxide such as …
Who coined polymers?
chemist J. J. Berzelius
The word “polymer” was introduced by the Swedish chemist J. J. Berzelius. He considered, for example, benzene (C6H6) to be a polymer of ethyne (C2H2). Later this definition underwent a subtle modification [1].
What is the chemical formula for polymer?
Some Common Addition Polymers
| Name(s) | Formula | Monomer |
|---|---|---|
| Polyethylene high density (HDPE) | –(CH2-CH2)n– | ethylene CH2=CH2 |
| Polypropylene (PP) different grades | –[CH2-CH(CH3)]n– | propylene CH2=CHCH3 |
| Poly(vinyl chloride) (PVC) | –(CH2-CHCl)n– | vinyl chloride CH2=CHCl |
| Poly(vinylidene chloride) (Saran A) | –(CH2-CCl2)n– | vinylidene chloride CH2=CCl2 |
What is the oldest plastic?
Share: It was in 1862 that Alexander Parkes introduced the world’s first-ever man-made plastic, at the London International Exhibition. “Parkesine,” as it was called, was marketed as an alternative to ivory and horn that Parks discovered while trying to develop a synthetic substitute for shellac for waterproofing.
