High-Density Molded Cellulose Fibers and Transparent Biocomposites Based on Oriented Holocellulose

Abstract

Ecofriendly materials based on well-preserved and nanostructured wood cellulose fibers are investigated for the purpose of load-bearing applications, where optical transmittance may be advantageous. Wood fibers are subjected to mild delignification, flow orientation, and hot-pressing to form an oriented material of low porosity. The biopolymer composition of the fibers is determined. Their morphology is studied by scanning electron microscopy, cellulose orientation is quantified by X-ray diffraction, and the effect of beating is investigated. Hot-pressed networks are impregnated by a methyl methacrylate monomer and polymerized to form thermoplastic wood fiber/poly­(methyl methacrylate) biocomposites. Tensile tests are performed, as well as optical transmittance measurements. Structure–property relationships are discussed. High-density molded fibers from holocellulose have mechanical properties comparable with nanocellulose materials and are recyclable. The thermoplastic matrix biocomposites showed superior mechanical properties (Young’s modulus of 20 GPa and ultimate strength of 310 MPa) at a fiber volume fraction of 52%, with high optical transmittance of 90%. The study presents a scalable approach for strong, stiff, and transparent molded fibers/biocomposites.

Interface tailoring by a versatile functionalization platform for nanostructured wood biocomposites

“…PAA delignification also preserves cellulose fibril structure, cellulose molar mass as well as hemicellulose distribution in the cell wall, avoiding severe chemical degradation. 56 Preserved cellulose molar mass suggests preserved fibril stiffness and strength, while high hemicellulose content prevents cellulose fibril aggregation and largely preserves nanoscale fibril distribution. The removal of lignin is confirmed by the absence of characteristic lignin peaks in the FTIR spectra (Fig.…”

Analisis Holoselulosa: Tinjauan Metode Analisis Kimia Konvensional

“…Holoselulosa menjadi bahan yang mendapatkan perhatian karena merupakan bahan baku yang digunakan untuk menghasilkan pulp dan kertas (Ramawat and Ahuja, 2016), holoselulosa nanofibril (Park et al, 2017), selulosa alfa (Sunardia et al, 2019), biokomposit (Yang et al, 2019), bioetanol (Vaz et al, 2016), aerogel (Huang et al, 2020).…”

The impact of molded pulp product process on the mechanical properties of molded Bleached Chemi-Thermo-Mechanical Pulp

“…This process has been developed and modified but its use in industry was first limited to the manufacturing of egg trays. In the last decade, its interest has grown and more reports can be found on its specificity [8][9][10][11]. The MPP process can vary depending on the destination of the manufactured product.…”