Periodate oxidation of xylan-based hemicelluloses and its effect on their thermal properties

Börjesson, Mikaela; Larsson, Anette; Westman, Gunnar; Ström, Anna

doi:10.1016/j.carbpol.2018.08.110

Cited by 43 publications

(52 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, their MWDs are narrowed ( Figure S2-S4) because the polydispersity indices are reduced (Figure 1d and Table S6). The degradation after periodate oxidation resulting in reduction in MW 33,35 and polydispersity indices 35 was also reported in previous studies.…”

Section: Synthesis Of Arabinoxylan Ethers and Activated Arabinoxylan supporting

confidence: 81%

Structural Composition Explains Differences in Stretchability for Compression-Molded Arabinoxylan-Based Thermoplastic Films

Deralia¹,

Sonker²,

Lund³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

<div><div><div><p>Valorization of argi-waste polymers into value-added materials is essential for sustainable development of polymeric industry. Reported herein is a 1-step and 2-step strategy for fabrication of flexible and stretchable thermoplastics prepared by compression molding from two structurally different arabinoxylans (AX). The synthesis was accomplished using n-butyl glycidyl ether whose epoxide ring opened on hydroxyl group and resulted in introduction of alkoxide sidechains for the 1-step synthesis. AX was preactivated by periodate oxidation as 1st step for the 2-step synthesis. Two structurally different AXs, i.e. wheat bran extracted arabinoxylan (AXWB, araf/xylp=3/4) and barley husk extracted arabinoxylan (AXBH, araf/xylp=1/4) were used to understand the effects of the araf/xylp on thermoplastic properties because melt processability has been rare for low araf/xylp AXs. AXBH-derived samples demonstrated melt compression processability. AXWB and AXBH derived thermoplastics featured dual and single glass transition (Tg) characteristics respectively as confirmed by DSC and DMA, but AXBH derived thermoplastics had lower stretchability (maximum 160%) compared to AXWB samples (maximum 300 %). Higher araf/xylp and thus in turn longer alkoxide side chains in AXWB derived thermoplastics explained differences in stretchability.</p></div></div></div>

show abstract

Section: Synthesis Of Arabinoxylan Ethers and Activated Arabinoxylan supporting

confidence: 81%

Structural Composition Explains Differences in Stretchability for Compression-Molded Arabinoxylan-Based Thermoplastic Films

Deralia¹,

Sonker²,

Lund³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…dA-AX samples are presented in Table 2. Mn and Mw of neat AX are close to that of wheat AX (low viscosity) from a previous study using DMSO as solvent 48 , but lower than that of another study 35 . DMSO based SEC (used in this study) generally provide lower average molar masses compare to water-based SEC 48 .…”

Section: Molar Mass Distribution Average Molar Masses and Polydispersupporting

confidence: 69%

“…The molar masses could not obtain for di-alcohol samples because they were not soluble in DMSO. The molecular weights were decreased after oxidation due to degradation of the AX polymers 35 (Table S4). Likewise, the Tg of AX (Araf/Xylp 1.1) was shown to remain unchanged upon oxidation in a previous study 35 It becomes clear that Tg of the activated AX ethers (Tg ranged between -67 to 143 °C) reduced compared to their counterparts, i.e.…”

Section: Molar Mass Distribution Average Molar Masses and Polydispermentioning

confidence: 99%

“…Tuning these interactions/factors by chemical modification leads to decrease in Tg below the degradation temperature. In this context, it has been shown that the Tg of xylan decreased to 70 °C , 124 °C and 134 °C upon derivatization with propylene oxide 32 and butyl glycidyl ether 34 and upon oxidation 35 , respectively. Tg of glucomannan was also shown to decrease upon acylation and the glucomannan acylates could be thermo-processed 11 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oxidation Level and Glycidyl Ether Structure Determine Thermal Processability and Thermomechanical Properties of Arabinoxylan-Derived Thermoplastics

Deralia¹,

Poset²,

Lund³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Herein we present arabinoxylan (AX)-based thermoplastics obtained by ring opening oxidation and subsequent reduction (dA-AX) combined with hydrophobization with three different glycidyl ethers [n-butyl (BuGE), isopropyl (iPrGE) and 2-ethylhexyl (EtHGE) glycidyl ether]. We also present the relationship of structural composition, thermal processing and thermomechanical properties. The BuGE and iPrGE etherified dA-AXs showed glass transition temperatures (T<sub>g</sub>) far below their degradation temperatures and gave thermoplastic materials when compression-molded at 140˚C. The BuGE (3 mole) etherified dA-AX films at 19 and 31 % oxidation levels exclusively exhibit 244 % (±42) and 267 % (±72) elongation. In contrast, iPrGE-dA-AX samples with shorter and branched terminals in the side chains had maximum 60 % (±19) elongation. The dramatic difference in elongation is assumed to be due to the presence of longer alkoxide chains, higher molar substitution and dual T<sub>g</sub> for the BuGE samples. Such superior elongation of AX thermoplastic films and its relationship with molar substitution and T<sub>g</sub> has not been reported before.

show abstract

“…The cell wall of lignocellulose mainly consists of lignin, cellulose, and hemicellulose [5]. The amount of each constituent is related to the type of plant species and their age [6]. Although 2 of 13 lignocellulose is rich in cellulose and hemicellulose, its high lignin content, and tough and strong physical structure make it difficult to convert into chemicals and biofuels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dilute Acid and Alkali Pretreatments on the Catalytic Performance of Bamboo-Derived Carbonaceous Magnetic Solid Acid

et al. 2019

View full text Add to dashboard Cite

Lignocellulose is a widely used renewable energy source on the Earth that is rich in carbon skeletons. The catalytic hydrolysis of lignocellulose over magnetic solid acid is an efficient pathway for the conversion of biomass into fuels and chemicals. In this study, a bamboo-derived carbonaceous magnetic solid acid catalyst was synthesized by FeCl3 impregnation, followed by carbonization and –SO3H group functionalization. The prepared catalyst was further subjected as the solid acid catalyst for the catalytic conversion of corncob polysaccharides into reducing sugars. The results showed that the as-prepared magnetic solid acid contained –SO3H, –COOH, and polycyclic aromatic, and presented good catalytic performance for the hydrolysis of corncob in the aqueous phase. The concentration of H+ was in the range of 0.6487 to 2.3204 mmol/g. Dilute acid and alkali pretreatments of raw material can greatly improve the catalytic activity of bamboo-derived carbonaceous magnetic solid acid. Using the catalyst prepared by 0.25% H2SO4-pretreated bamboo, 6417.5 mg/L of reducing sugars corresponding to 37.17% carbohydrates conversion could be obtained under the reaction conditions of 120 °C for 30 min.

show abstract

Periodate oxidation of xylan-based hemicelluloses and its effect on their thermal properties

Cited by 43 publications

References 45 publications

Structural Composition Explains Differences in Stretchability for Compression-Molded Arabinoxylan-Based Thermoplastic Films

Structural Composition Explains Differences in Stretchability for Compression-Molded Arabinoxylan-Based Thermoplastic Films

Oxidation Level and Glycidyl Ether Structure Determine Thermal Processability and Thermomechanical Properties of Arabinoxylan-Derived Thermoplastics

Effect of Dilute Acid and Alkali Pretreatments on the Catalytic Performance of Bamboo-Derived Carbonaceous Magnetic Solid Acid

Contact Info

Product

Resources

About