Key advances in development of straw fibre bio-composite boards: An overview

Aladejana, John Tosin; Wu, Zhenzeng; Fan, Mizi

doi:10.1088/2053-1591/ab66ec

Cited by 28 publications

(8 citation statements)

References 134 publications

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“…The methods of straw management are characterized by certain limitations, hence, there is still a need to develop new methods and technologies for its use. The straw surplus can be successfully used in polymer composites [ 26 , 27 ]. Composites containing various types of plant fillers are produced on an industrial scale and continuous research results in the continuous expansion of the area of their application.…”

Section: Introductionmentioning

confidence: 99%

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

2021

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Currently, up to 215 million metric tons of harvestable straw are available in Europe, 50% of the crops come from wheat, 25% from barley and 25% from maize. More than half of the production remains undeveloped. The overproduction of straw in the world means that the current methods of its management are insufficient. The article describes the production method and characterization of natural rubber biocomposites containing cereal straw powder modified with functional nano-additives in the form of carbon black, silica and halloysite nanotubes. The use of cereal straw in the elastomer matrix should contribute to obtaining a product with good mechanical properties while ensuring a low cost of the composite. In turn, the application of the mechanical modification process will allow the combination of specific properties of raw materials to obtain new, advanced elastomeric materials. As part of the work, hybrid fillers based on mechanically modified cereal straw were produced. The impact of hybrid fillers on mechanical, rheometric and damping properties was assessed. The flammability and susceptibility of the obtained biocomposites to aging processes were determined. The use of hybrid fillers based on mechanically modified straw allowed us to obtain a higher cross-linking density of vulcanizates (even up to 40% compared to the reference sample), and thus higher values of the rheometric moment during the vulcanization process of rubber mixtures (from approx. 10% (10 phr of filler) up to 50% (30 phr of filler) in relation to the unfilled system) and higher hardness of vulcanizates (by about 30–70%). The curing time of the blends was slightly longer, but the obtained composites were characterized by significantly higher tensile strength. The use of fillers in the elastomer matrix increased the modulus at 100, 200 and 300% and the elongation at break. Moreover, greater resistance of vulcanizates to the combustion process was confirmed.

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Section: Introductionmentioning

confidence: 99%

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

2021

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“…61 However, ductile characteristics such as the microlayer and corrugated structure were observed in Figure 9(d) and, additionally, the appearance of voids and gaps in Figure 9(c) and (f) was due to interaction between fillers and matrix which made interfacial adhesion stronger, thus leading to cavitation of PVC particles. 55,62 Moreover, Figure 9(b) and (e) which correspond to 3% alkaline-treated, happened to resist more wear from SWC and SKC, and indicated that low alkaline concentration on SWC and SKC improve resistance to abrasive wear more than higher alkaline concentration treatment.…”

Section: Abrasive Wear Of the Compositesmentioning

confidence: 93%

Analysis of the properties of alkaline-treated rape straw and stalk polyvinyl chloride composites

Bichi

Zhang

Yang

et al. 2022

Textile Research Journal

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Wood-plastic composites are being widely used more and more, and the bonding strength between fillers and matrix is an important factor affecting the properties of wood-plastic composites. In this study, rapeseed straw and rapeseed stalk were pretreated with sodium hydroxide and then filled with polyvinyl chloride matrix to prepare composites. The chemical composition, thermal stability, microstructure, physical properties, mechanical properties, and abrasive wear resistance of the composites were characterized, and the effects of different concentrations of alkaline treatment on rapeseed straw composite and rapeseed stalk composite were revealed. The results show that alkaline treatment has no significant effect on the chemical composition of the composites but has an obvious effect on other properties. Among them, after 1% alkaline treatment, rapeseed straw composite has the highest hardness, thermal stability, and impact strength, rapeseed stalk composite has the highest impact strength and bending strength. After 3% alkaline treatment, rapeseed straw composite has more wear resistance, rapeseed stalk composite has the highest density, the highest tensile strength, and more wear resistance. The rapeseed straw composite with 5% alkaline treatment has the highest density, and the rapeseed stalk composite with 7% alkaline treatment has the highest thermal stability. The hardness of rapeseed stalk composite and the tensile strength and bending strength of rapeseed straw composite decreased with the increase of alkaline treatment concentration.

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“…Elementary straw fiber is comparable to wood fiber, and thus, pulping of straw to substitute wood fiber in the pulp and paper industry is an obvious opportunity, as is the production of nanocellulose . Further, composite boards of straw disintegrated to various stages embedded in a polymer matrix, − or even binderless straw-based boards offer interesting opportunities. In terms of use as a structural material, the low-density straw and a low-wettability wax layer coating the epidermis present significant obstacles to the production of composite materials similar to important wood composites such as particle board or fiberboard. , Overall, this demonstrates the potential of straw to be a promising raw material for producing various materials with a wide range of properties.…”

Section: Introductionmentioning

confidence: 99%

Delignification and Densification as a Route to Enable the Use of Wheat Straw for Structural Materials

Neudecker,

Jakob,

Bodner

et al. 2023

ACS Sustainable Chem. Eng.

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Cereal straw is an abundant byproduct of crop production. Despite little current use in materials, the biologically optimized structure, which carries the weight of a structure up to 1.5 m high and protects it against environmental impacts, shows considerable potential. In order to be able to use this renewable material for structural purposes, barriers such as small dimensions and a low density have to be overcome. In the present study, lignin was partially removed from wheat straw using an alkaline solution with the aim of increasing the relative cellulose content and improving malleability. Thereafter, a homogeneous, dense, and multilayered material was produced by densification at elevated temperatures. Outstanding improvements in mechanical performance were obtained compared to the untreated raw material. For the optimum variant, tensile strength increased by a factor of three (average strength 218 MPa) and elastic modulus increased by a factor of four (average 13 GPa), which is within the range of established wood-based structural materials. We propose that mild alkaline treatment as carried out in the present study may significantly facilitate the development of high-value structural materials based on little utilized cereal straw.

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Key advances in development of straw fibre bio-composite boards: An overview

Cited by 28 publications

References 134 publications

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

Straw/Nano-Additive Hybrids as Functional Fillers for Natural Rubber Biocomposites

Analysis of the properties of alkaline-treated rape straw and stalk polyvinyl chloride composites

Delignification and Densification as a Route to Enable the Use of Wheat Straw for Structural Materials

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