Synthesis and physical-mechanical properties of polyurethane-polyisocyanurate foams based on PET-waste-derived modified polyols

Abstract

A series of aromatic polyester polyols (APP) were synthesized by transesterification of industrial poly(ethylene terephthalate) (PET) waste using di(ethylene glycol) in the presence or absence of glycerol, adipic acid, poly(propylene glycol), or hexanediol as functional additives. PET-waste-derived modified APP was used for the synthesis of polyurethane—polyisocyanurate (PU-PIR) foams. The isocyanurate yield of the PU-PIR foams determined by the temperature method was high (67—90%) and correlated well with the data of Fourier transform infrared measurements. The effect of chemical structure of the APP and its properties (viscosity, acid number, and hydroxyl number) on technological characteristics of the PU-PIR foams at equal/similar formulations was studied. PU-PIR foams prepared using PET-waste-derived APP were characterized by high closed cell content (more than 94%). The presence of the fragments of glycerol in the structure of APP decreased the core density and tensile strength and increased elongation at break of the resulting PU-PIR foams while the presence of the fragments of adipic acid acted vice versa.

Elaboration and Characterization of Advanced Biobased Polyurethane Foams Presenting Anisotropic Behavior

“…We assumed that their low contents compared to urethane groups induce a weaker signal which is at the origin of the nonreturn to the baseline of the spectra in the 1700–1600 cm −1 area. Then, the last important peak appearing on all spectra at 1412 cm −1 is attributed to isocyanurate absorption band . It indicates that even in PU formulation with low excesses of isocyanate function, a small amount of isocyanurate is formed.…”

Preparation and characterization of waterborne polyurethane containing PET waste/PPG as soft segment

“…These glycolyzed oligoesters of PET waste obtained using different alcoholysis agents can be used to produce fresh industrial products such as unsaturated polyesters, polymer‐composites, polymer concrete and others . Among them, WPU synthesized from the production of PET waste has attracted much attention recently.…”

Graft‐interpenetrating polymer networks of epoxy with polyurethanes derived from poly(ethyleneterephthalate) waste

“…The ester linkages which form the backbone of PET can be chemically transformed by processes like glycolysis, aminolysis, hydrolysis, acidolysis, alkalolysis, and alcoholysis, out of which the former two have reached the level of commercial maturity . The polyester polyols formed as a result of glycolytic depolymerization of PET have further been used for preparation of industrially important polymers including polyurethanes, unsaturated polyesters, and UV curable films …”