A study on recyclable waterborne polyurethane process with a photo and thermal hybrid treatment system

作者：Nakatani Hisayuki^*; Nakamura Tomohiro; Motokucho Suguru

来源：Reactive and Functional Polymers, 2018, 127: 168-176.

DOI：10.1016/j.reactfunctpolym.2018.04.012

Development of a novel recycling process of waterborne polyurethane (WBPU) with a poly(oxytetramethylene) glycol (PTMG) soft segment was performed using characteristics of nitroxyl radical (TEMPO) dormant bond. A TiO2 /hindered amine light stabilizer (HALS) combination produced the dormant bond in a 24 h UV irradiated WBPU. The WBPU extraction rate was 66% with a water-ethanol solvent, and its bond was found to contain a PTMG sequence by Py-GC/MS measurement. The binary blend of extracted WBPU and PTMG was immiscible and converted to miscible one by thermal treatment at 120 degrees C for 0.5 h in nitrogen. The WBPU was partially graft-polymerized onto the PTMG by the treatment and worked as a compatibilizer. The change to miscibility showed that the blend was recyclable as PTMG material.

• 出版日期2018-6