Elastics: Where God and Science Smooch

What It Covers

Josh Clark and Chuck Bryant trace the full history of elastic — from 7,000-year-old loincloths and medieval braies through Charles Goodyear's vulcanization breakthrough, wartime synthetic rubber development, and DuPont's 1959 invention of spandex — explaining the polymer chemistry that makes stretchy materials work and eventually fail.

Key Questions Answered

• •Vulcanization chemistry: Charles Goodyear discovered that slow-cooking latex with sulfur cross-links polymer chains, creating sulfur-atom molecular bonds that maintain flexibility across extreme temperature ranges. Thomas Hancock reverse-engineered this process, filed the patent weeks before Goodyear, and won the subsequent lawsuit. Goodyear died broke despite inventing the process; the Goodyear Tire company named itself after him posthumously.
• •Elastomer molecular mechanics: Rubber's stretchiness comes from its elastomer polymer structure — long coiled molecular chains that straighten in the direction of applied force, then recoil to original shape upon release. This behavior depends on a low glass transition temperature; below negative 70°C, even vulcanized rubber crystallizes and becomes brittle, explaining why elastic waistbands fail faster in cold climates.
• •Elastic degradation timeline: Rubber breaks down through three primary mechanisms: ozone exposure begins breaking sulfur-polymer bonds within days, UV radiation accelerates molecular deterioration over time, and sustained cold temperatures reduce snapback resilience. Understanding this explains why elastic garments stored in dark, temperature-controlled environments last measurably longer than those exposed to sunlight or outdoor cold.
• •Wartime synthetic rubber: FDR coordinated the four largest US rubber companies in 1942 after Japan seized Southeast Asian rubber-producing territories, cutting off supply. Within 18 months, they produced three synthetic rubber variants — butadiene, styrene-butadiene, and ethylene propylene monomer — the latter two forming the basis of most synthetic rubbers still manufactured today, splitting the patent equally among participants.
• •Spandex origin and prevalence: DuPont chemists invented spandex in 1959 by forcing diluted polyurethane polymer through a perforated plate, producing fine threads that accept dye, resist moisture absorption, and maintain shape through repeated washing. The material now appears in approximately 80% of all clothing purchased by Americans, including garments not typically associated with stretch fabric, such as dress shirts and casual footwear.