New approaches to producing polyols from biomass

Gómez-Jiménez-Aberasturi, Olga; Ochoa-Gómez, José R.

doi:10.1002/jctb.5149

Cited by 44 publications

(20 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because they are compatible with conventional adhesives and resins such as epoxides, polyurethanes, and isocyanates, materials used in industries such as construction, automotive, pharmaceutical, etc., and which usually come from petroleum derivatives [ 11 ]. Of these, polyols are of particular importance since they are capable of being combined with isocyanates for the production of polyurethanes, used to produce flexible polyurethane foams, rigid polyurethane foams, coatings, adhesives, sealants, and elastomers [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Bio-Degradable Polyurethane Foams Produced by Liquefied Polyol from Wheat Straw Biomass

et al. 2020

View full text Add to dashboard Cite

In the present work, an abundant and unused residue (wheat straw) has been employed to synthesize a polyol as a substituent of castor oil in polyurethane foams. The liquefied product showed excellent properties for the proposed application. Castor oil was substituted with up to 50% wheat straw polyol in the formulation of polyurethane foams, which were prepared using two different isocyanates (methylene diphenyl diisocyanate (MDI) and toluene-2,4-diisocyanate (TDI)). The evaluation of physical, mechanical, and thermal properties of the foams revealed that these materials can successfully be formed with up to 40% wheat straw polyols since all the results were improved. Moreover, at this polyol concentration, the morphology of the foams was presented as a compact and ordered structure. Following this trend, the foams showed excellent biodegradability at 30 days (5.60 and 7.31% for TDI and MDI foams, respectively) and 60 days (8.49 and 9.88% for TDI and MDI foams, respectively) in the soil media tests carried out. Thus, the materials prepared in this work can be proposed for agricultural applications such as use in plant nurseries.

show abstract

Section: Introductionmentioning

confidence: 99%

Bio-Degradable Polyurethane Foams Produced by Liquefied Polyol from Wheat Straw Biomass

et al. 2020

View full text Add to dashboard Cite

show abstract

“…More specifically, components extracted from wood products were the focus of many studies. This includes cellulose, 21,22 tannins, 6,23–25 and lignin 3,4,8,10,11,12,20,22,26,27,28–37,38–47,48,49 . Cellulose, is the main component of the wood structure and was generally liquefied to enter the polyol phase, using crude glycerol 21 or ethylene carbonate 22 .…”

Section: Introductionmentioning

confidence: 99%

“…Several options were already tested, using lignosulfonate, 39,54 Kraft lignin, 3,8,10,11,32,33 soda lignin or organosol lignin 28 . The approaches include the liquefaction into a polyol 22,30,32,44 (mainly polyethylene glycol, ethylene carbonate or glycerol, sometime microwaves assisted 12,31,36,37 ), the functionalization, 38,40,46,49,55 the depolymerization, 3 the oxypropylation 12 or the introduction as filler 20,34 . The final product can be a film, 11,40,43 an elastomer, 27,45 a rigid foam 3,4,10,20,32,35,36,42,45,54 or a flexible foam 12,31,33,34,37,38,41,45 .…”

Section: Introductionmentioning

confidence: 99%

Influence of lignin's pH on polyurethane flexible foam formation and how to control it

Maillard

Osso

Faye

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Low pH of commercial lignins has a catastrophic impact on the polyurethane foaming reactions. Experiments were performed with 10 wt% of lignin with various pHs in polyols. Virgin lignin (pH 2.5, 35% moisture) has the most negative impact as it reduces the initial foam rising rate by 85% and the foam's final height by 35% as compared to the reference foam, lignin free. Drying of this lignin at 80°C for 12 h can reduce this impact while alkaline treatment to bring the lignin's pH to 6.6 almost cancel it. As revealed by in situ dielectric constant measurements, both reactions, gelling via polymerization and blowing via CO2 degassing, are impacted. In situ Fourier transform infrared analysis of the foaming process demonstrated that blowing reaction is the most pH sensitive. Two methods to counter the pH influence by pH modification were tested and provide interesting results but also significant drawbacks limiting their applicability.

show abstract

“…The stricter legal regulations regarding the limitation of the use of disposable plastics, as well as the increased interest of the public in the protection of the natural environment, cause that the chemical industry is looking for new solutions based on natural origin raw materials [4,5]. Therefore, the current trend is to replace petrochemical polyols used in the synthesis of polyurethanes by polyols obtained from biomass, in which case sugars, vegetable oils and lignin are being used [6,7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

View full text Add to dashboard Cite

The man aim of this work was to investigate the effect of the molecular weight of polyols, mixture of prepolymers, and [NCO]/[OH] molar ratio used during the prepolymer chain extending step on the chemical structure, thermomechanical and mechanical properties, and thermal stability of thermoplastic poly(ether-urethane)s In this work thermoplastic poly(etherurethane)s were synthesized by using polyols with a various molecular weight, 4,4′-diphenylmethane diisocyanate and biobased glycol. Materials were obtained by a two-step method. The tests were carried out for polyurethanes obtained from a mixture of prepolymers and for reference samples. In the case of materials obtained with using mixture of prepolymers, the ratio of both prepolymers was determined on 50/50 weight percent. Soft segments of materials prepared with using mixture consist of two different polyols. The chemical structure was analyzed using FTIR spectroscopy. The Gaussian deconvolution technique was used to study the hydrogen bonding as well as to decompose carbonyl region of three peaks in various TPUs. The thermal degradation behavior was investigated by using thermogravimetric analysis at heating rates of 10 °C/ min. It was confirmed that the mixture of prepolymers has an effect of the degree of phase separation, thermal stability and selected properties of synthesized thermoplastic poly(ether-urethane)s.

show abstract

New approaches to producing polyols from biomass

Cited by 44 publications

References 44 publications

Bio-Degradable Polyurethane Foams Produced by Liquefied Polyol from Wheat Straw Biomass

Bio-Degradable Polyurethane Foams Produced by Liquefied Polyol from Wheat Straw Biomass

Influence of lignin's pH on polyurethane flexible foam formation and how to control it

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Contact Info

Product

Resources

About