Thermal and Mechanical Properties of Sodium Lignosulfonate-based Rigid Polyurethane Foams Prepared with Three Kinds of Polyols

Asano, Yasuhiro; Hatakeyama, Hyōe; Hatakeyama, Tatsuko

doi:10.2115/fiber.59.465

Cited by 7 publications

(5 citation statements)

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“…The peaks with a maximum intensity between 320 and 345°C in the dTG curves of the composites reinforced with curaua [Figure 4(b)] and coir fibers (figure not shown) were related to the mass loss associated with the break‐up of urethane bonds, i.e., the degradation of the hard segments in the PU matrix 14, 61. In addition, the moieties typical of NaLS present in the matrix began to decompose at this temperature, and the cellulose present in the fibers used as reinforcement also decomposes.…”

Section: Resultsmentioning

confidence: 99%

“…In neat lignopolyurethanes (nonreinforced), the Izod impact strength increased with increasing chain length of the polyol used: the lignopolyurethane prepared from CO [Figure 1(b)] exhibited higher impact strength than that of PEG [Figure 1(d)], which had higher impact strength than that of DEG [Figure 1(c)]. The use of polyols with longer chains may lead to a lower degree of crosslinking and a material with more elastomeric characteristics and high molecular mobility, resulting in higher impact strength 14…”

Section: Resultsmentioning

confidence: 99%

“…Evtuguin et al13 prepared crosslinked elastomeric PUs using oxygen–organosolv lignins isolated from spent liquors after the delignification of wood in different acidic organic solvent–water mixtures. Asano et al14 prepared rigid PU using sodium lignosulfonate (NaLS) and observed that with increasing NaLS content, the glass transition temperature ( T g ) of PU increased whereas the degradation temperature decreased. Hatakeyama et al15 prepared semirigid PU foams using lignin (kraft and lignosulfonate), molasses, PEG polyols and observed that the apparent density of PU foams increased with increasing lignin content.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Composites based on renewable materials: Polyurethane‐type matrices from forest byproduct/vegetable oil and reinforced with lignocellulosic fibers

Ramires

Oliveira

Frollini

2013

J of Applied Polymer Sci

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The use of products and byproducts from the agro-industry and forest biorefinery is essential for the development of value-added and low environmental-impact materials. In this study, polyurethanes were prepared using sodium lignosulfonate (NaLS) and castor oil (CO) as reagents and were used to prepare composites reinforced with lignocellulosic fibers, namely, curaua and coir fibers (30 wt %, 3 cm length, and randomly oriented). The SEM images of fractured surfaces of the composites revealed excellent adhesion at the fiber/matrix interface of both coir and curaua composites, which probably resulted from the favorable interactions between polar groups, as well as amid low polarity domains that are present in both the matrix and the reinforcements. The composites exhibited different impact/flexural and strength/flexural moduli (NaLS/CO/Curaua ¼ 465 Jm À1 /44 MPa/2 GPa; NaLS/CO/Coir ¼ 180 Jm À1 /25 MPa/1 GPa). The higher tensile strength/aspect ratio of the curaua fibers (485 MPa/259) compared with that of the coir fibers (120 MPa/130) most likely contributes to the enhanced performance of its composite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composites based on renewable materials: Polyurethane‐type matrices from forest byproduct/vegetable oil and reinforced with lignocellulosic fibers

Ramires

Oliveira

Frollini

2013

J of Applied Polymer Sci

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“…Polyols, except lignin, can affect the mechanical and thermal properties of polyurethane foams. Hatakeyama et al [169,170] investigated the mechanical and thermal properties of lignin-based polyurethane foams derived from sodium lignosulfonate mixed with diethylene glycol, triethylene glycol, and PEG. The glass transition temperatures and thermal stability increased with decreasing oxyethylene chain lengths, and the compression strength and compression modulus increased with increasing oxyethylene chain lengths.…”

Section: Urethanizationmentioning

confidence: 99%

Conversion of technical lignins to functional materials with retained polymeric properties

Matsushita

2015

J Wood Sci

158

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A significant amount of technical lignins is produced in the pulp and paper industries. However, most technical lignins are burned for thermal recycling and a few percent are used as materials, such as lignosulfonate as a dispersant. Native lignin has a highly complex structure and is susceptible to structural variations depending on the pulping process, thus hindering the effective utilization of lignins. The procedures used to convert lignins into functional materials include depolymerization to monomeric fragments followed by re-building to functional materials, and chemical modifications to generate functional polymers with retained polymeric properties. In this paper, the latter is disserted. The characteristics of technical lignins, which include kraft lignin, lignosulfonate, and organosolv lignin, and their conversion to functional materials such as polyesters, polyethers, polyurethanes, etc. and the applications of lignin-based materials in some fields are discussed.

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“…63,65,66 The KL had a higher content of phenolic hydroxyl groups (Online Supplemental Table S2) which form less stable urethane bonds than aliphatic hydroxyl groups, which were predominant in the OL and LS. 63,67 In the range 280–350°C, the rate of weight loss in the KL PUF was lower than in the other materials (DTG). Once the more labile urethane bonds were broken, a lower rate in the KL PUF due to a higher thermal stability in the remaining urethane network caused by higher cross-link density or a differing biopolyol structure was possible.…”

Section: Resultsmentioning

confidence: 90%

Rigid polyurethane foams from unrefined crude glycerol and technical lignins

Muller

Marx

Vosloo

et al. 2018

Polymers from Renewable Resources

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The need for green materials has driven interest in the preparation of rigid polyurethane foam (PUF) from various biomass types. The present study aims at increasing bio-based content by utilizing by-products from both the pulp and paper and biodiesel industries. Bio-based polyols from respective liquefaction of kraft lignin, organosolv lignin and lignosulphonate in crude glycerol were employed to prepare rigid PUFs. The highest foam compressive strength was 345 kPa with density 79 kg m À3 ; thermal conductivity was 0.039 W m À1 K À1 and the corresponding material had 44 wt% renewable content. Thermal characteristics and biodegradability were also evaluated. Technical lignin type was found to determine product properties to a large extent. Based on the use of existing industrial scale by-products in this study, the findings can be beneficial for present and future biorefineries in the valorization of lower value by-product streams.

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Thermal and Mechanical Properties of Sodium Lignosulfonate-based Rigid Polyurethane Foams Prepared with Three Kinds of Polyols

Cited by 7 publications

References 0 publications

Composites based on renewable materials: Polyurethane‐type matrices from forest byproduct/vegetable oil and reinforced with lignocellulosic fibers

Composites based on renewable materials: Polyurethane‐type matrices from forest byproduct/vegetable oil and reinforced with lignocellulosic fibers

Conversion of technical lignins to functional materials with retained polymeric properties

Rigid polyurethane foams from unrefined crude glycerol and technical lignins

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