| Samuel D. Gehman | |
| Birth Date: | Dec. 7, 1903 |
| Death Date: | Jun. 1, 1992 |
| Nationality: | American |
| Field: | Polymer science |
| Work Institution: | Goodyear Tire and Rubber Company |
| Known For: | Glass transition temperature of rubber |
Samuel Dwight Gehman (December 7, 1903 – June 1, 1992) was a Goodyear physicist noted for development of a modulus-based measurement of rubber's glass transition temperature.[1] [2]
Gehman was born on December 7, 1903. He died in Akron, Ohio, on June 1, 1992.[3]
In 1922, he was one of eight sophomores selected for honors at the University of Pennsylvania.[4] He completed his doctoral dissertation in 1929 on the topic Reflection of Soft X-rays.[5]
Gehman was recruited to Goodyear by Ray P. Dinsmore. He made influential studies of strain crystallization via x-rays,[6] of rubber's dynamic properties,[7] and of heat transfer in rubber.[8] He managed physics research at Goodyear's research division and was renowned for developing the Gehman low-temperature twist test, which gave laboratories convenient and precise low-temperature stiffening measurements of rubber compounds.[9] He was an inventor of approximately 70 patents.[10]
In 1972, Gehman was listed at 10th out of the 100 top contributors to the world's rubber literature published between 1932 and 1970.[11]
Gehman retired in 1968 following 40 years with Goodyear Tire & Rubber Co.