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Your search keyword '"Biocomposite"' showing total 3 results
3 results on '"Biocomposite"'

1. Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

Author

Raúl Fangueiro, Gonzalo Mármol, Christian Gauss, and Universidade do Minho

Subjects
Materials science, Polyesters, Pharmaceutical Science, biopolymers, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, Article, Analytical Chemistry, lcsh:QD241-441, Crystallinity, chemistry.chemical_compound, Polylactic acid, lcsh:Organic chemistry, Tensile Strength, Spectroscopy, Fourier Transform Infrared, Drug Discovery, Ultimate tensile strength, Fiber, Physical and Theoretical Chemistry, Cellulose, Composite material, cellulose nanocrystals, chemistry.chemical_classification, Science & Technology, Calorimetry, Differential Scanning, Polyhydroxyalkanoates, Organic Chemistry, microfibers, Polymer, 021001 nanoscience & nanotechnology, cellulose, multis-scale, 0104 chemical sciences, chemistry, Chemistry (miscellaneous), Thermogravimetry, Microscopy, Electron, Scanning, Nanoparticles, Molecular Medicine, Spectrophotometry, Ultraviolet, Biocomposite, 0210 nano-technology, Kraft paper
Abstract

Cellulose nanocrystals (CNC) have attracted the attention of many engineering fields and offered excellent mechanical and physical properties as polymer reinforcement. However, their application in composite products with high material demand is complex due to the current production costs. This work explores the use of cellulose microfibers (MF) obtained by a straightforward water dispersion of kraft paper to reinforce polyhydroxyalkanoate (PHA) and polylactic acid (PLA) films. To assess the influence of this type of filler material on the properties of biopolymers, films were cast and reinforced at different scales, with both CNC and MF separately, to compare their effectiveness. Regarding mechanical properties, CNC has a better reinforcing effect on the tensile strength of PLA samples, though up to 20 wt.% of MF may also lead to stronger PLA films. Moreover, PHA films reinforced with MF are 23% stronger than neat PHA samples. This gain in strength is accompanied by an increment of the stiffness of the material. Additionally, the addition of MF leads to an increase in the crystallinity of PHA that can be controlled by heat treatment followed by quenching. This change in the crystallinity of PHA affects the hygroscopicity of PHA samples, allowing the modification of the water barrier properties according to the required features. The addition of MF to both types of polymers also increases the surface roughness of the films, which may contribute to obtaining better interlaminar bonding in multi-layer composite applications. Due to the partial lignin content in MF from kraft paper, samples reinforced with MF present a UV blocking effect. Therefore, MF from kraft paper may be explored as a way to introduce high fiber concentrations (up to 20 wt.%) from other sources of recycled paper into biocomposite manufacturing with economic and technical benefits., This research was funded by TSSiPRO; NORTE-01-0145-FEDER-000015-project, Technologies for Sustainable and Smart Innovative Products, which involves this research work and financed by the European Regional Development Fund (ERDF) through the Support System for Scientific and Technological Research (Structured R & D & I Projects) of the Regional Operational Program for Northern Portugal 2020.

Published
2020

2. Cellulose Nanofibrils Filled Poly(Lactic Acid) Biocomposite Filament for FDM 3D Printing

Author

Chencheng Ji, Lushan Sun, Jianzhong Sun, Jun Liu, and Qianqian Wang

Subjects
Materials science, Absorption of water, Polyesters, Composite number, Nanofibers, Pharmaceutical Science, Article, Analytical Chemistry, law.invention, Polyethylene Glycols, lcsh:QD241-441, chemistry.chemical_compound, Polylactic acid, Cellulase, lcsh:Organic chemistry, law, Tensile Strength, Drug Discovery, Ultimate tensile strength, Pressure, Humans, Thermal stability, Physical and Theoretical Chemistry, Cellulose, Composite material, biocomposite filaments, physical property, melt extrusion, Fused deposition modeling, Hydrolysis, Organic Chemistry, cellulose nanofibrils, 3D printing, chemistry, Chemistry (miscellaneous), Printing, Three-Dimensional, Molecular Medicine, Biocomposite
Abstract

As direct digital manufacturing, 3D printing (3DP) technology provides new development directions and opportunities for the high-value utilization of a wide range of biological materials. Cellulose nanofibrils (CNF) and polylactic acid (PLA) biocomposite filaments for fused deposition modeling (FDM) 3DP were developed in this study. Firstly, CNF was isolated by enzymatic hydrolysis combined with high-pressure homogenization. CNF/PLA filaments were then prepared by melt-extrusion of PLA as the matrix and CNF as the filler. Thermal stability, mechanical performance, and water absorption property of biocomposite filaments and 3D-printed objects were analyzed. Findings showed that CNF increased the thermal stability of the PLA/PEG600/CNF composite. Compared to unfilled PLA FDM filaments, the CNF filled PLA biocomposite filament showed an increase of 33% in tensile strength and 19% in elongation at break, suggesting better compatibility for desktop FDM 3DP. This study provided a new potential for the high-value utilization of CNF in 3DP in consumer product applications.

Published
2020
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3. Functional Properties and Molecular Degradation of Schizostachyum Brachycladum Bamboo Cellulose Nanofibre in PLA-Chitosan Bionanocomposites.

Author

Rizal, Samsul, Saharudin, N. I., Olaiya, N. G., Khalil, H. P. S. Abdul, Haafiz, M. K. Mohamad, Ikramullah, Ikramullah, Muksin, Umar, Olaiya, Funmilayo G., Abdullah, C. K., Yahya, Esam Bashir, and Maio, Andrea

Subjects
*POLYLACTIC acid, *CELLULOSE, *SUPERCRITICAL carbon dioxide, *GLASS transition temperature, *FLEXURAL modulus, *MELT spinning, *FLEXURAL vibrations (Mechanics)
Abstract

The degradation and mechanical properties of potential polymeric materials used for green manufacturing are significant determinants. In this study, cellulose nanofibre was prepared from Schizostachyum brachycladum bamboo and used as reinforcement in the PLA/chitosan matrix using melt extrusion and compression moulding method. The cellulose nanofibre(CNF) was isolated using supercritical carbon dioxide and high-pressure homogenisation. The isolated CNF was characterised with transmission electron microscopy (TEM), FT-IR, zeta potential and particle size analysis. The mechanical, physical, and degradation properties of the resulting biocomposite were studied with moisture content, density, thickness swelling, tensile, flexural, scanning electron microscopy, thermogravimetry, and biodegradability analysis. The TEM, FT-IR, and particle size results showed successful isolation of cellulose nanofibre using this method. The result showed that the physical, mechanical, and degradation properties of PLA/chitosan/CNF biocomposite were significantly enhanced with cellulose nanofibre. The density, thickness swelling, and moisture content increased with the addition of CNF. Also, tensile strength and modulus; flexural strength and modulus increased; while the elongation reduced. The carbon residue from the thermal degradation and the glass transition temperature of the PLA/chitosan/CNF biocomposite was observed to increase with the addition of CNF. The result showed that the biocomposite has potential for green and sustainable industrial application. [ABSTRACT FROM AUTHOR]

Published
2021
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