Stephanie Kwolek was born in New Kensington, Pennsylvania in 1923. Upon graduating in 1946 from the Carnegie Institute of Technology (now Carnegie-Mellon University) with a bachelor’s degree, Stephanie Kwolek went to work as a chemist at the DuPont Company. She would ultimately obtain 28 patents during her 40-year tenure as a research scientist. In 1995, Stephanie Kwolek was inducted into the National Inventors Hall of Fame.

Kwolek was in her 40s when she was asked to scout for the next generation of high-performance fibers. This assignment involved preparing intermediates, synthesizing paraoriented aromatic polyamides of high molecular weight, dissolving the polyamides in solvents, and spinning these solutions into fibers. She unexpectedly discovered that under certain conditions large numbers of the molecules of these rod-like polyamides become lined up in parallel, that is, form liquid crystalline solutions, and that these solutions can be spun directly into oriented fibers of very high strength and stiffness. These polyamide solutions were unlike any polymer solutions previously prepared in the laboratory. They were unusually fluid, turbid, and buttermilk-like in appearance, and became opalescent when stirred. The person in charge of the spinning equipment initially refused to spin the first such solution because he feared that the turbidity was caused by the presence of particles that would plug the tiny holes (0.001 inch in diameter) in the spinneret. He was finally persuaded to spin, and much to his surprise, strong, stiff fibers were obtained with no difficulty. Following this breakthrough many fibers were spun from liquid crystalline solutions, including the yellow Kevlar fiber.

Economic Impact Invention:

Kwolek has received many awards for her invention of the technology behind Kevlar fiber, including induction into the National Inventors Hall of Fame in 1994 as only the fourth woman member of 113. In 1996 she received the National Medal of Technology, and in 1997 the Perkin Medal, presented by the American Section of the Society of Chemical Industry—both honors rarely awarded to women. She has served as a mentor for other women scientists and participated in programs that introduce young children to science. One of Kwolek's most cited papers, written with Paul W. Morgan, is "The Nylon Rope Trick" (Journal of Chemical Education, April 1959, 36:182–184). It describes how to demonstrate condensation polymerization in a beaker at atmospheric pressure and room temperature—a demonstration now common in classrooms across the nation.

LINKS:

1. Chemical Heritage Foundation
2. MIT
3. About.com
4. Smithsonian.org