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Recycling the recycled: Transforming cotton dust into high-performance regenerated cellulose fibers using ioncell® technology
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School of Chemical Engineering |
Master's thesis
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en
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63
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Abstract
This thesis explores the recycling of cotton waste from the company Recover™ into Ioncell® fibers, demonstrating a proof of concept for converting pre-consumer waste into regenerated cellulose fibers suitable for textile applications. The initial characterization of the cotton dust waste (CoD) established its suitability as a cellulose source, but its high viscosity and molar mass required pre-treatment to reduce the molecular weight for optimal dissolution. The milled and adjusted cotton was dissolved in the ionic liquid, 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]), to prepare a homogeneous spinning dope, which was extruded through a spinneret, and resulted into fibers by the Ioncell® process.
The regenerated fibers exhibited excellent mechanical properties and crystallinity, with tenacities that surpassed the industry average for recycled fibers (>50 cN/tex). This work demonstrates the viability of utilizing pre-consumer cotton waste as a raw material for the production of high-performance regenerated fibers, providing an innovative approach to addressing the challenges of textile recycling.
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Supervisor
Tehrani, AliThesis advisor
Schlapp-Hackl, IngeHummel, Michael