Modified and thermoplastic rapeseed straw xylan: A renewable additive in PCL biocomposites

Svärd, Antonia; Brännvall, Elisabet; Edlund, Ulrica

doi:10.1016/j.indcrop.2018.03.067

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…An alkylketene dimer and an alkenyl succinic anhydride were used to hydrophobize xylan in a recent study, but thermoplasticity was not achieved (Cheng et al, 2021). Previous studies have demonstrated that ring opening polymerization of ε-caprolactone on hemicellulose can make it melt processable (Farhat et al, 2018;Svärd et al, 2018) We previously demonstrated that AX with a high araf/xylp (0.8 and 1.1) after one-step and two-step functionalization with BuGE can potentially be processed using the polymer processing technique (Börjesson et al, 2019a(Börjesson et al, , 2019bDeralia et al, 2021aDeralia et al, , 2021b. In these studies, AX hydroxyl groups were deprotonated into alkoxides after reaction with epoxides.…”

Section: Introductionmentioning

confidence: 99%

Side chains affect the melt processing and stretchability of arabinoxylan biomass-based thermoplastic films

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Side chains affect the melt processing and stretchability of arabinoxylan biomass-based thermoplastic films

et al. 2022

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“…The use of interfacial compatibilizer in WPCs can improve the compatibility of material interface to a certain extent, but cannot fundamentally overcome structural defects 11,13 . After chemical modification, such as etherification 23 and esterification 1 , plant fibers exhibit hydrophobicity and thermoplasticity to certain extend, and their interface compatibility with resin matrix is improved 1,3,24,25 .…”

Section: Introductionmentioning

confidence: 99%

“…So far, researches related to WPCs have focused on modification of plant fibres 1,3,12,13 , surface grafting of matrix resins 18–20 , blending techniques 2,5,6 , and mechanical performance 1,2,5,6 . Studies on mechanism of the chemical modification of cereal straw have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Reaction Mechanism of Etherification of Rice Straw with Epichlorohydrin in Alkaline Medium

Shang

Wang

et al. 2019

Sci Rep

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Wood plastic composites (WPCs) made from plant fibres and plastics have gained more and more attention. Studies have been focused on preparation and mechanical performance of WPCs. While mechanism of chemical modification of cereal straw has rarely been reported. In the present work, rice straw was etherified with epichlorohydrin (EPI) and the mechanism of etherification was investigated. Natural rice straw (NRS) was pretreated with NaOH to move most of hemicellulose and lignin. The alkali treated rice straw (ARS), whose dominant component being cellulose, was etherified with EPI at 120 °C for 1–8 h in toluene with NaOH as catalyst. NRS, ARS and etherified rice straw (ERS) were characterized and analyzed by FT-IR, solid CP/MAS 13C-NMR, elemental analysis and neutral sugar analysis. The etherification reaction was finished within 5 h, and C3H6O units were introduced into the structure of cellulose, leading to the increase of contents of C and H in ERS. The etherification process of ARS in alkaline medium was divided into three stages, during which two hydroxyl groups were replaced by two ether bonds successively, and a new hydroxyl group was formed in the last step. The number of hydroxyl groups in ERS was reduced, and reduction of hydrophilicity of ERS could be expected.

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“…Due to the repulsive force, the nonpolar surface produced a larger contact angle, which caused the reduced hydrophilicity [ 39 ]. The decrease in hydrophilicity contributed to reducing mechanical properties loss under wet environment and reducing the water vapor permeation of the film [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Mechanical and Barrier Property of Hemicellulose Film via Crosslinking with Sodium Trimetaphosphate

et al. 2021

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Hemicellulose is a kind of biopolymer with abundant resources and excellent biodegradability. Owing to its large number of polar hydroxyls, hemicellulose has a good barrier performance to nonpolar oxygen, making this biopolymer promising as food packaging material. Hydrophilic hydroxyls also make the polymer prone to water absorption, resulting in less satisfied strength especially under humid conditions. Thus, preparation of hemicellulose film with enhanced oxygen and water vapor barrier ability, as well as mechanical strength is still sought after. Herein, sodium trimetaphosphate (STMP) was used as esterification agent to form a crosslinked structure with hemicellulose through esterification reaction to render improved barrier performance by reducing the distance between molecular chains. The thus modified hemicellulose film achieved an oxygen permeability and water vapor permeability of 3.72 cm3 × μm × m−2 × d-1 × kPa−1 and 2.85 × 10−10 × g × m−1 × s−1 × Pa−1, respectively, at the lowest esterification agent addition of 10%. The crosslinked structure also brought good mechanical and thermal properties, with the tensile strength reaching 30 MPa, which is 118% higher than that of the hemicellulose film. Preliminary test of its application in apple preservation showed that the barrier film obtained can effectively slow down the oxidation and dehydration of apples, showing the prospect of application in the field of food packaging.

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Modified and thermoplastic rapeseed straw xylan: A renewable additive in PCL biocomposites

Cited by 16 publications

References 32 publications

Side chains affect the melt processing and stretchability of arabinoxylan biomass-based thermoplastic films

Side chains affect the melt processing and stretchability of arabinoxylan biomass-based thermoplastic films

Reaction Mechanism of Etherification of Rice Straw with Epichlorohydrin in Alkaline Medium

Enhancement of Mechanical and Barrier Property of Hemicellulose Film via Crosslinking with Sodium Trimetaphosphate

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