If Staudinger provided the existence of polymers, (1899–1963) provided their mechanics. In the 1930s and 1940s, Kuhn, working at the University of Basel and later in Germany, developed the statistical mechanical model of polymer chains. He proposed the Kuhn segment —a hypothetical unit of a polymer chain that acts independently of its neighbors. This model allowed physicists to apply random walk statistics to long molecules.
The Stretch of Genius: German Contributions to Nylon and Polymer Physics german nylonpics
Staudinger’s work on viscosity—specifically the Staudinger index (later the intrinsic viscosity)—provided the first physical link between molecular mass and solution behavior. He demonstrated that the viscosity of a polymer solution increased dramatically with chain length, a phenomenon that could only be explained by long, thread-like molecules. This was the first quantitative physics of synthetic fibers. For this, he received the Nobel Prize in 1953, cementing Germany’s role as the birthplace of macromolecular science. This model allowed physicists to apply random walk
During the 1930s and 1940s, German industry (I.G. Farben) developed its own synthetic fiber, (polyamide 6), independently of DuPont’s nylon 66. While Perlon used a different monomer (caprolactam), its production relied entirely on German physical principles: melt spinning, orientation drawing, and annealing. German physicists realized that drawing a nylon fiber (stretching it to several times its length) forces the polymer chains to align parallel to the fiber axis. This increases crystallinity, tensile strength, and modulus. The physics of strain-induced crystallization —a phenomenon first rigorously described in German laboratories—explains why a nylon fishing line is strong but a nylon stockinette is supple. This was the first quantitative physics of synthetic fibers
The story of German nylon physics begins not with a fiber, but with a controversy. In the 1920s, most chemists believed that polymers like rubber and cellulose were aggregates of small molecules held together by mysterious "partial valences" (colloidal theory). The German chemist (1881–1965) proposed a radical alternative: polymers were long chains of thousands of atoms linked by ordinary covalent bonds. While Staudinger was primarily an organic chemist, his insistence on the existence of macromolecules was the necessary precondition for polymer physics.