Preparation and characterization of water‐blown polyurethane foams from liquefied cornstalk polyol

Yan, Yunjun; Pang, Hao; Yang, Xiaoxu; Zhang, Rongli; Liao, Bing

doi:10.1002/app.28692

Cited by 87 publications

(80 citation statements)

References 23 publications

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“…Several attempts have been made to use liquefied wood , sugar cane bagasse (Hakim et al 2011), and wheat straw (Chen and Lu 2009), as well as corn bran, stover, and stalks (Lee et al 2000;Wang et al 2008;Yan et al 2008), to produce polyurethane foams. Recently, liquefied cork has been used for the production of polyurethane foams, although the investigations did not report the liquefaction yields nor the amount of suberin that had been dissolved (Gama et al 2015).…”

Section: Polyurethane Foamsmentioning

confidence: 99%

Cork Liquefaction for Polyurethane Foam Production

et al. 2017

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aCork is one of the most important forest products in Portugal. The cork processing industry is highly resource-efficient, and the only residue is cork powder, which is too small for agglomerate production. This work studied the usage of cork powder for the production of added-value products via polyol liquefaction. Liquefactions were performed in a reactor using a mixture of polyethylene glycol (PEG 400) and glycerol as solvents, which were catalyzed by the addition of sulphuric acid. Several cork-tosolvent ratios, reaction temperatures, and reaction times were tested. Polyurethane foams were prepared by combining polyol mixtures with a catalyst, surfactant, blowing agent, and polymeric isocyanate. Mechanical tests of the produced foams were conducted, and compressive modulus of elasticity and compressive stress at 10% deformation were determined. The results show that the best conditions for obtaining high liquefaction yields are as follows: 160 °C for 1 h; glycerol-to-PEG 400 ratio of 1:9; corkto-solvent ratio of 1:6; and 3% H2SO4 catalyst addition. The Fourier Transform Infrared (FTIR) spectra indicated that the lignocellulosic fractions of the cork were more selectively dissolved during acidified polyol liquefaction than the suberin. With liquefied cork powder using these optimized conditions, it is possible to produce polyurethane foams with desired properties.

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Section: Polyurethane Foamsmentioning

confidence: 99%

Cork Liquefaction for Polyurethane Foam Production

et al. 2017

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“…From a cost-saving viewpoint, it is better to directly use the liquefaction products without removing solid residue because it saves a separation process. Currently, a considerable amount of biomass has been liquefied to prepare bio-based PU foams, such as wheat straw (Chen and Lu 2009), cornstalk (Yan et al 2008), sugar cane bagasse (Hakim et al 2011), waste paper (Lee et al 2002), rape straw (Huang et al 2018), wood (Cheumani-Yona et al 2014), and lignin (Xue et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Fourier transform infrared spectroscopy (FTIR) analysis has been demonstrated as an effective way to characterize the production of PU foam (Tien and Wei 2001;Ebert et al 2005;Zhang et al 2013). Additionally, the thermal behaviors of biofoams made from liquefaction biopolyols with solid residue in a nitrogen and air atmosphere have been reported in previous work (Yan et al 2008), but the influence of solid residue on the chemical structure of PU foam remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability Analysis of Polyurethane Foams Made from Microwave Liquefaction Bio-Polyols with and Without Solid Residue

Huang¹,

Hoop²,

Peng³

et al. 2018

BioResources

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The thermal stabilities of bio-based polyurethane (PU) foams made from liquefaction bio-polyols with and without solid residue were analyzed by thermogravimetric analysis (TGA) and Fourier transform infrared spectrometry (FTIR). Yaupon holly (Ilex vomitoria) was subjected to microwave liquefaction at different reaction temperatures to characterize the variations of bio-polyol and solid residue with temperature. The results indicated that the solid residue decreased when the temperature increased from 120 °C to 160 °C, while it increased slightly when further increasing temperature to 200 °C. The hydroxyl number decreased with increased reaction temperature. The TGA of PU foams demonstrated that the use of liquefaction bio-polyol with and without solid residue to produce PU foam increased the thermal stability of biofoams as compared with petro-based foam. Moreover, the presence of solid residue in bio-polyol enhanced the thermal stability of biofoams. The FTIR analysis of PU foams suggested that the solid residue had a negative effect on the formation of urethane bonds.

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“…When a woody powder is mixed with an organic solvent in the presence of an acid catalyst and heated, a black viscous liquid material is formed. This material is called liquefied wood and can form resin by adding chemical reagents [4]- [6]. Actually, although there are some samples that can provide an alternative to traditional resin, most of these are used as organic solvents above twice as much as woody biomasses.…”

Section: Introductionmentioning

confidence: 99%

Basic Study on the Decayed Behavior of Waste Woody Samples Caused by Three White-Rot Fungi

Wang¹,

Takahashi²,

Kawamura³

et al. 2017

WIT Transactions on Ecology and the Environment

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In this study, we investigated the decayed behavior of waste woody samples caused by three kinds of white-rot fungi known as Coriolus consors, Coriolus hirsutus and Ischnoderma resinosum, which were selected to prepare and develop the decayed woody samples from original woody biomasses. After 8 weeks of decaying, the weights of all decayed woody samples had decreased. From the results of analysis of the major woody holocellulose and lignin, the same ratios of weight decrement in all decayed woody samples were found when compared with their original woody sample. It seemed that these components had degraded simultaneously. The crystallinities of woody samples had increased even though woody samples were decayed. It was thought that the amorphous parts of cellulose and hemicellulose were decomposed preferentially. We tried to use these decayed woody samples as samples for the liquefaction experiment. It is observed that the decayed woody samples may be liquefied to be the same as their original woody samples basing on the molecular weight distribution, chemical structure and other chemical parameters of the liquefied contents.

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Preparation and characterization of water‐blown polyurethane foams from liquefied cornstalk polyol

Cited by 87 publications

References 23 publications

Cork Liquefaction for Polyurethane Foam Production

Cork Liquefaction for Polyurethane Foam Production

Thermal Stability Analysis of Polyurethane Foams Made from Microwave Liquefaction Bio-Polyols with and Without Solid Residue

Basic Study on the Decayed Behavior of Waste Woody Samples Caused by Three White-Rot Fungi

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