Erratum to “A novel approach to recycling of polyurethanes: chemical degradation of flexible polyurethane foams by triethyl phosphate” [Polymer, 41 (2000) 7017]

Troev, K.; Grancharov, Georgy; Tsevi, R.; Tsekova, A.

doi:10.1016/s0032-3861(00)00932-0

Cited by 10 publications

(10 citation statements)

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“…It means that the bonds of N-H in PU chains were broken by TEP, then, hydrogen bonding between carbonyl group and -NH in urethane is disappeared. These results are consistent with the decomposition mechanism of polyurethane proposed by Troev who suggests that structures and molecular weights of the degraded polyurethane products could be variable [3][4][5]. Fig.…”

Section: Chemical Structure Of Depsupporting

confidence: 91%

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Flame retardant properties of polyurethane produced by the addition of phosphorous containing polyurethane oligomers (II)

Chung

Kim

2009

Journal of Industrial and Engineering Chemistry

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Section: Chemical Structure Of Depsupporting

confidence: 91%

“…In recent days, Troev et al studied chemical degradation of polyurethane with esters of phosphoric or phosphonic acids to produce phosphorous containing oligomer [3][4][5]. The decomposed products were characterized by NMR and viscometer.…”

Section: Introductionmentioning

confidence: 99%

Flame retardant properties of polyurethane produced by the addition of phosphorous containing polyurethane oligomers (II)

Chung

Kim

2009

Journal of Industrial and Engineering Chemistry

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“…Glycolysis has been described as a suitable procedure to break down the PU chain. [1][2][3][4][5] Most of the glycolysis processes proposed in literature produce a liquid mixture of products containing hydroxyl active groups, which can be used only in blending with raw materials. Nevertheless, better quality products can be achieved from flexible PU foams using a two-phase glycolysis, enabled by the higher molecular weight of polyols used in this kind of PU.…”

Section: Introductionmentioning

confidence: 99%

Influence of the use of recycled polyols obtained by glycolysis on the preparation and physical properties of flexible polyurethane

Molero

Lucas

Romero

et al. 2008

J of Applied Polymer Sci

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Polyurethanes (PUs) represent one of the most important groups of plastics, and so the increasing quantity of wastes makes their recycling an urgent task. The general purpose of PU chemical recycling is to recover constituent polyol, a valuable raw material. Among the suitable processes, glycolysis in two phases allows better quality products. The objective of this work is the evaluation of the option to apply the recovered polyols to obtain PU with identical characteristics to the starting raw material, and so several foaming tests were carried out according to the evaluation method employed in free expansion foaming of conventional flexible slabstock foams. To achieve this objective, a formulation recipe for flexible foams was selected, in which the raw polyol was totally or partially replaced for recovered polyol. The foaming formulations were modified because of the different amount of active hydrogens in the recovered polyols and the virgin polyol. Amounts up to 50% could be applied without relevant changes in rising profiles and the physical properties of the foams. The foams were characterized, and according to its appropriate characteristics they can be employed in the same applications where a commercial one made with raw polyol is used.

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“…Thereafter, formaldehyde derivatives such as hexamethylenetetramine which is a linear amine compound have been employed. In other research undertaken by Troev et al , triethyl phosphate has been used as a degrading agent for PU foams . After completing the recycling process, the product was cooled to 60 °C under vacuum to separate the unreacted triethyl phosphate molecules from the formed polyols and reuse them.…”

Section: Introductionmentioning

confidence: 99%

Modeling of glycolysis of flexible polyurethane foam wastes by artificial neural network methodology

et al. 2015

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The glycolysis process as a useful approach to recycling flexible polyurethane foam wastes is modeled in this work. To obtain high quality recycled polyol, the effects of influential processing and material parameters, i.e. process time, process temperature, catalyst-to-solvent (Cat/Sol) and solvent-to-foam (Sol/Foam) ratios, on the efficiency of the glycolysis reaction were investigated individually and simultaneously. For the continuous prediction of process behavior and interactive effects of parameters, an artificial neural network (ANN) model as an efficient statistical-mathematical method has been developed. The results of modeling for the criteria that determine the glycolysis process efficiency including the hydroxyl value of the recycled polyol and isocyanate functional group conversion prove that the adopted ANN model successfully anticipates the recycling process responses over the whole range of experimental conditions. The Cat/Sol ratio showed the strongest influence on the quality of the recycled polyol among the studied parameters, where the minimum hydroxyl value was obtained at a medium amount of the assigned ratio. For the consumed polyurethane foam, a higher value of this ratio led to an increase in the hydroxyl value and isocyanate conversion.

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Erratum to “A novel approach to recycling of polyurethanes: chemical degradation of flexible polyurethane foams by triethyl phosphate” [Polymer, 41 (2000) 7017]

Cited by 10 publications

References 0 publications

Flame retardant properties of polyurethane produced by the addition of phosphorous containing polyurethane oligomers (II)

Flame retardant properties of polyurethane produced by the addition of phosphorous containing polyurethane oligomers (II)

Influence of the use of recycled polyols obtained by glycolysis on the preparation and physical properties of flexible polyurethane

Modeling of glycolysis of flexible polyurethane foam wastes by artificial neural network methodology

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