Paul Flory Nobel Prize in Chemistry 1974 Date of Birth: 01.01.1910 Country: USA

1. Early Life and Education
2. Research at DuPont and University of Cincinnati
3. Research at Esso Laboratories and Goodyear
4. Pioneering Work at Cornell University
5. Groundbreaking Discoveries in Polymer Science
6. Flory's Contributions to Polymer Solutions
7. Mellon Institute and Stanford University
8. Legacy and Impact
9. Later Life and Accomplishments

Early Life and Education

Paul John Flory, an American physical chemist, was born on June 19, 1910, in Sterling, Illinois, to Ezra and Martha Flori. After completing his secondary education, he enrolled at Manchester College in Indiana in 1927. Inspired by Professor C.V. Hall, he pursued his interest in chemistry. He earned his bachelor's degree in 1931 and continued his studies at Ohio State University, where he earned his master's degree in organic chemistry and later shifted to physical chemistry, completing his dissertation on the photochemistry of nitrogen oxides.

Research at DuPont and University of Cincinnati

After obtaining his doctorate in 1934, Flory joined DuPont de Nemours in Wilmington, Delaware, as part of the research group led by W.H. Carothers. Following Carothers' suicide in 1937, Flory left the company in 1938 and became an assistant professor at the University of Cincinnati's Research Laboratory of Fundamental Sciences.

Research at Esso Laboratories and Goodyear

In September 1940, Flory joined Esso Laboratories in Linden, New Jersey, to investigate the elasticity of rubber, specifically the new butyl rubber derived from petroleum gases. In October 1943, he joined Goodyear Tire and Rubber as head of fundamental research, a role that brought him widespread recognition.

Pioneering Work at Cornell University

In the spring of 1948, Flory was invited by Nobel laureate Peter Debye to Cornell University in Ithaca, New York. His lectures laid the foundation for a new discipline: polymer chemistry. He was appointed Professor of Chemistry at Cornell in 1949. Over the next four decades, Flory devoted his research to the physicochemical properties of polymers.

Groundbreaking Discoveries in Polymer Science

Flory's research significantly advanced the understanding of polymer behavior. He demonstrated that the reactivity of chemical groups in polymers is essentially the same as in small molecules (Flory Principle, 1936). He investigated the kinetics of three-dimensional polycondensations, elucidating the molecular weight distribution of resulting polymers (1941-1952). His work on polymer mechanics explained the formation of branched structures, leading to the development of elastic polymers. He also established the relationship between the number of defects in polymer networks and their tensile strength.

Flory's Contributions to Polymer Solutions

Flory discovered that polymer molecules in solution could not be accurately described using probabilistic-statistical methods applicable to small molecules. However, he found that at specific temperatures (theta-points), polymer solutions behaved as "ideal" solutions. Flory also identified a constant that characterizes polymer solutions, known as Flory's constant, which relates viscosity to molecular radius in the third power. This constant has been used extensively to study the configuration of polymer chains, including biological macromolecules.

Mellon Institute and Stanford University

In 1956, Flory became an Associate Director for Research at the Mellon Institute of Applied Research in Pittsburgh, Pennsylvania. His work there focused on fundamental problems, including liquid crystals. In 1961, he joined the faculty of Stanford University in California.

Legacy and Impact

Flory's pioneering work culminated in the publication of his influential book, "Statistical Mechanics of Chain Molecules" (1969). He received the Nobel Prize in Chemistry in 1974 for his exceptional contributions to the theoretical and experimental study of the physical chemistry of macromolecules. His research continues to inspire and guide advancements in polymer science and related fields.

Later Life and Accomplishments

After retiring from Stanford University in 1975, Flory remained active in research as a consultant to IBM and collaborated with researchers at San Jose. He expanded his investigations to include the elasticity of fibrous proteins in muscles. Flory passed away on September 8, 1985, while working at his vacation home in Big Sur, California.