BioPEtex, solution-dyed and sustainable T-shirt made from organic raw materials

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In the multi-billion-pound fibre market, fossil-based polyesters (PES) dominate the clothing sector, accounting for 52% of the market. Unfortunately, PET, the most commonly used PES, cannot be produced on an industrial scale as 100% bio-based material, unlike polyethylene (PE). Bio-based PE (bioPE), a drop-in polymer derived from fermented starches or sugars, has properties identical to those of fossil-based PE and is easily recyclable. It is also more cost-effective than other biopolymers used in fibres and can be processed at lower temperatures, which saves energy. Solution-dyed bioPE offers significant environmental benefits: it consumes 50% less energy and water than conventional dyeing processes and emits 60% less CO2.

Life cycle assessments (LCA) predict that PE could significantly reduce the textile industry’s ecological footprint, with solution-dyed bio-PE further enhancing this reduction. Furthermore, PE textiles are IR-transparent and thus provide passive cooling for the body.
Despite these advantages, PE is not yet used in the clothing industry. Preliminary research findings from the ITA suggest that PE can be processed into spun, dyed filaments and knitted fabrics with promising textures. The T-shirt on display is spun and dyed and features an elastic surface made from bio-based raw materials. A bio-based elastic finish enhances the T-shirt, which is made from a single source and is thermomechanically recyclable.
Contact: Mathias.Ortega@ita.rwth-aachen.de