Elmer Kraemer
Elmer Otto Kraemer (born February 27, 1898 in Liberty (Wisconsin) , † September 7, 1943 in Pittsburgh ) was an American chemist, known for contributions to colloid chemistry and polymer chemistry.
Kraemer studied chemistry at the University of Wisconsin with a bachelor's degree in 1918. He was then an instructor and from 1921 on was on a study trip in Europe to the pioneer of colloid chemistry The Svedberg in Uppsala and in 1923 to Herbert Freundlich at the Kaiser Wilhelm Institute for Physical Chemistry in Berlin. When he returned to the USA with Svedberg, who was visiting professor at the University of Wisconsin, he was Svedberg's assistant and received his doctorate in 1924. In 1925 he became an assistant professor at the University of Wisconsin and from 1927 to 1938 he headed the colloid group at DuPont . There he was involved in the development of Nyon by Wallace Hume Carothers . He died of a brain haemorrhage.
In the 1920s he dealt with the examination of colloids (such as gelsols) with the ultramicroscope . Subsequently, from 1930 onwards, he investigated the molecular masses of, for example, polymers with the ultracentrifuge . In 1933 he and William D. Lansing (1902–1937) at DuPont succeeded in determining the molecular mass of a synthetic polymer using an ultracentrifuge. They also found relationships between molecular mass and viscosity in polymers.
Fonts
- The Ultracentrifuge 1939
literature
- Winfried R. Pötsch (lead), Annelore Fischer, Wolfgang Müller: Lexicon of important chemists , Harri Deutsch 1989, p. 249
| personal data | |
|---|---|
| SURNAME | Kraemer, Elmer |
| ALTERNATIVE NAMES | Kraemer, Elmer Otto (full name) |
| BRIEF DESCRIPTION | American chemist |
| DATE OF BIRTH | February 27, 1898 |
| PLACE OF BIRTH | Liberty (Wisconsin) |
| DATE OF DEATH | September 7, 1943 |
| Place of death | Pittsburgh |