Upcycling of cotton polyester blended textile waste to new man-made cellulose fibers

Simone Haslinger, Michael Hummel, Adina Anghelescu-Hakala, Marjo Määttänen, Herbert Sixta*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)
261 Downloads (Pure)


The creation of a circular economy for cellulose based textile waste is supported by the development of an upcycling method for cotton polyester blended waste garments. We present a separation procedure for cotton and polyester using [DBNH] [OAc], a superbase based ionic liquid, which allows the selective dissolution of the cellulose component. After the removal of PET, the resulting solution could be employed to dry-jet wet spin textile grade cellulose fibers down to the microfiber range (0.75–2.95 dtex) with breaking tenacities (27–48 cN/tex) and elongations (7–9%) comparable to commercial Lyocell fibers made from high-purity dissolving pulp. The treatment time in [DBNH] [OAc] was found to reduce the tensile properties (<52%) and the molar mass distribution (<51%) of PET under certain processing conditions.

Original languageEnglish
Pages (from-to)88-96
Number of pages9
JournalWaste Management
Publication statusPublished - 1 Sep 2019
MoE publication typeA1 Journal article-refereed


  • Cellulose PET separation
  • Dry-jet wet spinning
  • Ioncell
  • Ionic liquid
  • Polyethylene terephthalate
  • Textile recycling

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