Characteristics of glycolysis products of polyurethane foams made with polyhydric alcohol liquefied Cryptomeria japonica wood

Synthesis and characterisation of polyurethane elastomers with semi-products obtained from polyurethane recycling

“…Probably that is related with the presence of high molecular weight urethane oligomers. It is also possible that rests remaining from urethane bonds and by-products have in its structure aromatic rings which provide higher stability [40]. However, the amount of residue is higher for glycerolysate (~2 wt.%) than for neat polyol not only due to the remaining by-products in glycerolysate but also because of the inorganic contamination of crude glycerol (MONG and sulphated ash).…”

Biodegradability and Risk Assessment of Biomass-based Polymeric Materials

“…In polyhydric alcohol liquefaction, biomass is decomposed by heterolitic sovolysis and the decomposed components react with polyhydric alcohols or self-condense (Yu and Lee 2014). The phenolated wood for moldings can be obtained by the phenolysis of wood and the phenolation and condensation of its decomposed components, such as cellulose and lignin (Lin et al 1997) Therefore, the liquefied components of biomass do not play a role as the filler, but react chemically in the polyurethane foams and the moldings.…”

Hybrid Organic–Inorganic Composites Based on Glycolyzed Polyurethane

“…Among the various chemolysis techniques (glycolysis, acidolysis, alcoholysis, aminolysis, etc.) that have been demonstrated in recent years, glycolysis has been widely adopted owing to its relatively moderate reaction conditions. ,, However, a lack of control over the size and composition of recycled polyols obtained from PU chemolysis, stemming from random PU chain scission as well as variations in feedstock quality, limits their utility. , The intense color associated with recycled polyols and the need to purify them further restrict their use . Thus, despite the evident environmental advantages associated with their use, , these polyols are upcycled only as a partial replacement to virgin polyols in foam production.…”

“…15,16,26 However, a lack of control over the size and composition of recycled polyols obtained from PU chemolysis, stemming from random PU chain scission as well as variations in feedstock quality, limits their utility. 27,28 The intense color associated with recycled polyols and the need to purify them further restrict their use. 26 Thus, despite the evident environmental advantages associated with their use, 29,30 these polyols are upcycled only as a partial replacement to virgin polyols in foam production.…”