Improving lignocellulose thermal stability by chemical modification with boric acid for incorporating into polyamide

Zhang, Jingfa; Koubaa, Ahmed; Xing, Deke; Liu, Wanyu; Wang, Qingwen; Wang, Xiangming; Wang, Haigang

doi:10.1016/j.matdes.2020.108589

Cited by 47 publications

(24 citation statements)

References 32 publications

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“…However, the crystallinity of the cross-linked B5 hydrogels decreased. The similar reduction in crystallinity was found by Zhang et al 51 . Borax could destroy intermolecular and intermolecular hydrogen bonding of cellulose in the crystalline area, and B–O–C bonding would be formed between cellulose molecules, and this would restrict the mobility of cellulose chains 41 .…”

Section: Resultssupporting

confidence: 89%

Superabsorbent cellulose-based hydrogels cross-liked with borax

Tanpichai

Phoothong

Boonmahitthisud

2022

Sci Rep

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Cellulose, the most abundant biopolymer on Earth, has been widely attracted owing to availability, intoxicity, and biodegradability. Environmentally friendly hydrogels were successfully prepared from water hyacinth-extracted cellulose using a dissolution approach with sodium hydroxide and urea, and sodium tetraborate decahydrate (borax) was used to generate cross-linking between hydroxyl groups of cellulose chains. The incorporation of borax could provide the superabsorbent feature into the cellulose hydrogels. The uncross-linked cellulose hydrogels had a swelling ratio of 325%, while the swelling ratio of the cross-linked hydrogels could achieve ~ 900%. With increasing borax concentrations, gel fraction of the cross-linked hydrogels increased considerably. Borax also formed char on cellulose surfaces and generated water with direct contact with flame, resulting in flame ignition and propagation delay. Moreover, the cross-linked cellulose-based hydrogels showed antibacterial activity for gram-positive bacteria (S. aureus). The superabsorbent cross-linked cellulose-based hydrogels prepared in this work could possibly be used for wound dressing, agricultural, and flame retardant coating applications.

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Section: Resultssupporting

confidence: 89%

Superabsorbent cellulose-based hydrogels cross-liked with borax

Tanpichai

Phoothong

Boonmahitthisud

2022

Sci Rep

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“…No significant differences between the spectra of SPC (without boric acid) and SPCc (SPC with boric acid). The characteristic peaks at 1440 cm −1 and 1130 cm −1 corresponding to the bonds B–O and B–O–C stretching vibrations [ 36 ], which are usually use to prove the crosslinking or complexation reaction of boric acid with hydroxyl groups, in the present case, from side-chain groups in the protein fraction and/or carbohydrate fraction of SPC [ 6 ], were not visible in the spectrum of the modified adhesives ( Figure 2 ). This is due to the low amount of boric acid incorporated in the formulations as well as the presence of intense SPC bands in this wavenumber region.…”

Section: Resultsmentioning

confidence: 99%

“…Results revealed that the amide I band was composed by the superposition of at least 6 absorption bands related to different secondary structures: two bands at 1626 and 1683 cm −1 are associated with the amide groups involved in extended beta sheets, while that at 1651 cm −1 is related to α-helix and at 1643 cm −1 to random structures. The small peak at 1693 cm −1 is due to β-turns while that at 1619 cm −1 could be interpreted as intermolecular β-sheet structures related to protein aggregation [ 36 ]. This analysis provides evidence that SPC-based adhesives still preserve secondary structures that play a key role in the gluing ability of soy protein adhesives.…”

Section: Resultsmentioning

confidence: 99%

Antifungal Soybean Protein Concentrate Adhesive as Binder of Rice Husk Particleboards

Larregle¹,

Chalapud

Fangio

et al. 2021

Polymers

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The aim of this research was to prepare an antifungal soybean protein concentrate (SPC) adhesive containing carvacrol (CRV) as a bioactive agent able to delay the attack of molds and yeast during storage of SPC adhesive at 4 °C as water-based systems. CRV was incorporated in SPC slurry at 0.5% v/v (~10 times its minimum inhibitory concentration against Aspergillus terreus, used as model fungus), to ensure its long-term action. CRV scarcely altered the thermal properties, structure and apparent viscosity of SPC adhesive. Active SPC aqueous dispersion was microbiologically stable for at least 30 days at 4 °C where the colonization begins, while control SPC was visually colonized from the second day. Rice husk (RH) particleboards of density ~900 kg/m3 were manufactured using the active SPC stored for 0, 10, 20, and 30 days as a binder. Modulus of elasticity, modulus of rupture and internal bond of RH–control SPC (without CRV) panels were 12.3 MPa, 2.65 GPa and 0.27 MPa, respectively, and were statistically unaltered compared with those obtained with fresh SPC, regardless of the presence of CRV or the storage time. This last implies that active SPC should not necessarily have to be prepared daily and/or be used immediately after its preparation. Since it is microbiologically stabilized, it can be store at least for 30 days, ensuring the stability of the protein. The quality of the adhesive was evidenced by the consistent properties of the adhesive, expanding its potential use and commercialization.

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“…This fact is due to better filler dispersion in the matrix as well as the substantial distance between filler particles. Nevertheless, the flexural modulus for high filler content was increased noticeably because the distance was decreased by the addition of filler and the effect of each CSF particle was superposed providing an evident enhancement [ 86 ]. In general, these tendencies were in concordance with the previously recorded tensile properties, where the tensile modulus increased, and tensile strength decreased as filler content was added.…”

Section: Resultsmentioning

confidence: 99%

Contribution to a Circular Economy Model: From Lignocellulosic Wastes from the Extraction of Vegetable Oils to the Development of a New Composite

et al. 2021

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The present works focuses on the development of a novel fully bio-based composite using a bio-based high-density polyethylene (Bio-HDPE) obtained from sugar cane as matrix and a by-product of extraction of chia seed oil (CO) as filler, with the objective of achieving a circular economy model. The research aims to revalorize an ever-increasing waste stream produced by the growing interest in vegetable oils. From the technical point of view, the chia seed flour (CSF) was chemically modified using a silane treatment. This treatment provides a better interfacial adhesion as was evidenced by the mechanical and thermal properties as well as field emission scanning electron microscopy (FESEM). The effect of silane treatment on water uptake and disintegration rate was also studied. On the other hand, in a second stage, an optimization of the percentage of treated CSF used as filler was carried out by a complete series of mechanical, thermal, morphological, colour, water absorption and disintegration tests with the aim to evaluate the new composite developed using chia by-products. It is noteworthy as the disintegration rate increased with the addition of CSF filler, which leads to obtain a partially biodegradable wood plastic composite (WPC) and therefore, becoming more environmentally friendly.

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Improving lignocellulose thermal stability by chemical modification with boric acid for incorporating into polyamide

Cited by 47 publications

References 32 publications

Superabsorbent cellulose-based hydrogels cross-liked with borax

Superabsorbent cellulose-based hydrogels cross-liked with borax

Antifungal Soybean Protein Concentrate Adhesive as Binder of Rice Husk Particleboards

Contribution to a Circular Economy Model: From Lignocellulosic Wastes from the Extraction of Vegetable Oils to the Development of a New Composite

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