Liquefaction of crop residues for polyol production

Liu, Liang; Mao, Zhihuai; Li, Yebo; Chen, Wan; Wang, Tipeng; Zhang, Lian-Hui; Zhang, Lingyan

doi:10.15376/biores.1.2.248-256

Cited by 60 publications

(30 citation statements)

References 15 publications

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“…Agricultural lignocellulosic residues have been successfully converted into biopolyols using mainly a poly(ethylene glycol) (PEG) and glycerol mix. Application fields for the polymeric products developed from these residues include a wide range of different materials for areas such as packaging and floating 3‐10 …”

Section: Introductionmentioning

confidence: 99%

Liquefaction of corn husks and properties of biodegradable biopolyol blends

Briones¹,

Rodríguez²,

Labidi

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: A valorization route of corn husks from agrarian practices was performed by liquefaction using glycerol as liquefaction solvent to obtain biopolyols used as bioadditives in starch blends with the aim to find a useful industrial application in polymer processing. RESULTS: Low-molecular-weight liquefied products obtained from a practically total conversion reaction can be used for composite formulations (OH number, 310 mg KOH g −1 ; viscosity, 3.4 Pa s; molecular weight, 549 g mol −1). Concurrently, starch thermoplastic blends using various proportions of biopolyol (40, 30 and 20 wt%) as plasticizer were produced with maximum torque and plasticization energy ranging from 3.4 to 15.1 Nm and from 1.7 to 9.1 Nm min −1. The starch/biopolyol (70/30) sheets obtained by thermopressing showed properties similar to those of controls (starch/glycerol: 70/30), such as sensitivity to environment, retrodegradation, biodegradability and density; however, mechanical properties exhibited better performance compared to controls (Young's modulus, 14 MPa; strain at break, 33%; tensile strength, 1.2 MPa), which indicates a material with major mechanical balance. CONCLUSIONS: The adequacy in the conversion of corn husks into biopolyols that could be used as improved biobased plasticizers to obtain biodegradable blends is revealed. Hence, this study demonstrates that liquefied corn husk residues are sustainable resources with suitable properties for polymer processing, which can be applied in bioplastics and be considered as a value-added feature.

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Section: Introductionmentioning

confidence: 99%

Liquefaction of corn husks and properties of biodegradable biopolyol blends

Briones¹,

Rodríguez²,

Labidi

et al. 2020

J of Chemical Tech & Biotech

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show abstract

“…Biopolyol obtained from the biomass will be a potential alternative of polyester or polyether polyols for making biopolymers. 1,9 Shiraishi et al 10 reported that in the presence of organic solvents like polyethylene glycol and phenols, solid lignocellulosic biomass could be liquefied effectively into liquid products at 120–180°C in the presence of acid catalysts or at 180–250°C without catalysts. Tanaka et al 11 and Harikrishnan et al 12 have used palm oil and castor oil for producing PU foams respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The natural materials like starch, cellulose, soybean oil, 13 sugarcane bagasse, 1 wheat straw, 14 cornstalk 15 and dried distiller grains 16 have been employed for either preparing PUs or modifying their properties and degradability. 9 Kurimoto et al 3 showed that by varying the [NCO]/[OH] ratio, mechanical properties of PU foams can be controlled effectively. Carbon nanotubes (CNTs) have wide variety of applications in nanotechnology, electronics, optics and other fields of materials science due to its high aspect ratio, mechanical strength, electrical and thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon nanotubes on the properties of biopolyol based polyurethane foams

et al. 2021

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Biopolyols were obtained from liquefaction of sugarcane bagasse and rice husk. Acid and hydroxyl numbers were determined for estimating the polyol value of the liquid products. These prepared biopolyols were mixed with the commercial polyol for the preparation of polyurethane foam (PU). To study the effects of biopolyol on properties of PU foam, various ratios of biopolyol to commercial polyol were used. It was observed that the density and foaming time of the PU foam increases with the increase in biopolyol content. The calculated Isocyanate index showed that sugarcane bagasse polyol can be used to make flexible foam and that rice husk can be used to make rigid foam. Foaming times and full rise times increased with increase in the biopolyol content. The Fourier-transform infrared spectroscopy (FTIR) spectra of prepared foams showed the characteristic peaks related to PU foam. The morphological studies were carried out using scanning electron microscopy (SEM). Thermal conductivity tests proved that the synthesized PU foams can be used as insulating materials. Further, PU foams were also prepared with the incorporation of carbon nanotubes (CNTs) in the polyol. The densities, thermal conductivities and SEM analysis of PU foams with and without carbon nanotubes were compared.

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“…Biomass is another example of a raw material used in the plastics industry. The number of reports on the use of various types of the biomass, not only as a source of renewable energy but also as a raw material for receiving, among others, rigid polyurethane foams is constantly increasing [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure–Property Relationship of Polyurethane Foams Modified with Baltic Sea Biomass: Microcomputed Tomography vs. Scanning Electron Microscopy

et al. 2020

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In this paper, novel rigid polyurethane foams modified with Baltic Sea biomass were compared with traditional petro-based polyurethane foam as reference sample. A special attention was focused on complex studies of microstructure, which was visualized and measured in 3D with high-resolution microcomputed tomography (microCT) and, as commonly applied for this purpose, scanning electron microscopy (SEM). The impact of pore volume, area, shape and orientation on appearance density and thermal insulation properties of polyurethane foams was determined. The results presented in the paper confirm that microcomputed tomography is a useful tool for relatively quick estimation of polyurethane foams’ microstructure, what is crucial especially in the case of thermal insulation materials.

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Liquefaction of crop residues for polyol production

Cited by 60 publications

References 15 publications

Liquefaction of corn husks and properties of biodegradable biopolyol blends

Liquefaction of corn husks and properties of biodegradable biopolyol blends

Influence of carbon nanotubes on the properties of biopolyol based polyurethane foams

Microstructure–Property Relationship of Polyurethane Foams Modified with Baltic Sea Biomass: Microcomputed Tomography vs. Scanning Electron Microscopy

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