The fibers are typically heated and stretched in a steam bath, a process called "texturizing," which sets the permanent elastic memory. This prepolymer is then subjected to a chain extension process, where low molecular weight chain extenders like ethylene glycol are added.
Understanding Chain Extenders in Spandex Production
Consequently, regulatory bodies monitor the residual solvents left in the final fiber to ensure they are within safe limits for consumer wear. Spandex fabric, often recognized for its unparalleled stretch and form-fitting performance, is a cornerstone material in modern apparel.
Prepolymers are created by reacting diisocyanates—often methylene diphenyl diisocyanate (MDI)—with polyols. The Transformation into Fiber Once the polyurethane prepolymer is synthesized, it is extruded into a fiber through a process known as dry spinning.
Understanding Chain Extenders in Spandex Production
It is also resistant to perspiration, oils, and dry cleaning solvents, making it ideal for applications where longevity and minimal maintenance are required. Comparing Spandex to Other Elastomers.
More About What is spandex fabric made of
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