Article
Materials Science, Paper & Wood
Go Un Yang, Byantara Darsan Purusatama, Jong Ho Kim, Intan Fajar Suri, Denni Prasetia, Wahyu Hidayat, Fauzi Febrianto, Seung Hwan Lee, Nam Hun Kim
Summary: The physical and chemical characteristics of bamboo culm heat-treated at low temperature (200℃ to 320℃) were analyzed to understand the carbonization mechanisms. The weight loss, pH, and calorific value of the bamboo culm increased with increasing temperature. The crystalline cellulose changed to amorphous at various temperatures. The study concluded that there were significant differences in the physical and chemical characteristics of the carbonized bamboo culm at temperatures ranging from 200℃ to 320℃.
Article
Forestry
Wanju Li, Minghui Liu, Hankun Wang, Hongbo Zhai, Yan Yu
Summary: Through SEM and CLSM images, as well as nanoindentation and imaging FT-IR analysis, it is found that furfuryl alcohol resin is mainly located in the parenchymal cell cavity of the bamboo, and also present in the small cavities of the bamboo fibers. The results indicate that furfuryl alcohol resin can penetrate and polymerize within the cell wall of the bamboo fiber, leading to the significant improvement of furfurylated bamboo in both dimensional stability and biological durability.
Article
Materials Science, Paper & Wood
Michael Altgen, Lauri Rautkari
Summary: This study aimed to understand the role of hydroxyl accessibility in wood-water interaction during humidity-dependent changes in moisture content. The results showed that changes in hydroxyl accessibility were not the driving force for these changes, although a slow re-protonation rate at low relative humidity was observed.
Article
Construction & Building Technology
Yubin Zheng, Changdong Zhou, Peng Zhang, Yuqian Wang
Summary: Sustainable building materials, particularly bamboo/wood composites, are crucial for achieving carbon peaking and carbon neutrality goals. These materials offer superior mechanical performance and uncertainties, making them viable alternatives to natural high-quality wood in construction applications.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Manufacturing
Milan Ferdinand, Michael Jerabek, Robert Vardai, Thomas Lummerstorfer, Claudia Pretschuh, Markus Gahleitner, Gabor Faludi, Janos Moczo, Bela Pukansky
Summary: The deformation and failure analysis of PP/elastomer/wood flour composites reveals that various local deformation processes occur during loading, with different energy consumption. These processes can interact and even result in an antagonistic effect on impact resistance. Shear yielding of the matrix is the most energy-efficient process. The presence of wood decreases shear yielding by hindering overall deformation and initiating other local processes such as debonding. The role of debonding is controversial as it may increase or decrease plastic deformation and impact resistance. Wood fracture does not significantly contribute to impact resistance. If impact resistance is important, PP cannot be reinforced with wood flour, and other methods like adding synthetic fibers are more suitable.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Characterization & Testing
Age G. Larsen, Kjell Olafsen, Ben Alcock
Summary: The presence of a polyethylene fraction in recycled polypropylene affects its processing and properties. Different methods were compared to determine the PE content, with consistent estimates achieved through DSC, NMR, FT-IR, and gel content measurements. Experimentation with various material grades was conducted to understand how they impact the results.
Article
Engineering, Mechanical
Santosh Kumar, Nikhil Sharma, K. K. Singh
Summary: In this study, glass fibre reinforced polymer (GFRP) composites and GFRP composites incorporated with 0.5 wt% and 1 wt% of graphene nano-platelets (GNPs) were prepared using hand lay-up method and compression moulding. Tribological testing was conducted under dry-sliding conditions, and the Artificial Neural Network (ANN) technique was used to analyze the experimental data. The results showed that the ANN predicted the output parameters with a high accuracy and the wear mechanisms were examined using FESEM and EDS analysis.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Composites
Zhaoyan Cui, Ming Xu, Siyuan Tang, Yurong Shen, Liuhui Tu
Summary: Engineered bamboo and wood composites are increasingly used in construction due to their eco-friendly nature, low carbon footprint, and superior mechanical properties. This study investigated the combustion properties of different materials under different heat flux and grain direction conditions. The results showed that, despite their drawbacks and virtues, the engineered bamboo and wood composites performed better than engineered wood in terms of four combustion characteristics parameters. The peak heat release rate of engineered bamboo composites was larger when the grain direction was parallel. Therefore, engineered bamboo composites have the potential to be a safer and more reliable building material in terms of fire risk assessment.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Paper & Wood
Rudi Hartono, Jajang Sutiawan, Dede Hermawan, Santiyo Wibowo, Deni Zulfiana
Summary: Adding wood shavings can enhance the resistance of elephant dung particleboard to termite and decay attacks, but the addition of bamboo layering decreases its resistance. A 50/50 ratio of elephant dung and wood shavings achieved higher termite mortality and lower weight loss.
Article
Nanoscience & Nanotechnology
Sanghun Park, Sudip Kumar Pal, Tohid Otoufat, Gunwoo Kim
Summary: This study investigates the infrared absorption coefficient of various polymer types and introduces a new concept of radiative-cooling composites. By dispersing an infrared scattering medium in a polymer matrix, the infrared radiation can be effectively scattered and attenuated. This composite provides a new approach to enhance the radiative-cooling property of different polymer materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Sanghun Park, Sudip Kumar Pal, Tohid Otoufat, Gunwoo Kim
Summary: Radiative cooling attracts significant interest due to its potential to save energy consumption in HVAC systems and tackle global warming. However, the focus has mainly been on optimizing the geometries for selective wavelength absorption, rather than investigating and optimizing the polymer material itself. In this study, the authors investigate the infrared absorption coefficient of different polymer types and introduce a new concept of radiative-cooling composites. By dispersing an IR scattering medium in a polymer matrix, the authors demonstrate effective scattering and attenuation of infrared radiation, leading to improved cooling performance in a window film. This composite offers a promising approach to enhance radiative cooling properties in various polymer materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Multidisciplinary
Lando Mentrasti, Luisa Molari, Marco Fabiani
Summary: The paper discusses the constraints imposed by the positive definite character of strain energy on the values of Poisson's ratios in a linear elastic orthotropic constitutive law. By utilizing the reciprocity principle and conservation of energy, non-trivial constraints lead to a particularly expressive form of the domain of existence. The analysis establishes notable restrictions for the elastic behavior of orthotropic composite materials, especially in cases with significant differences in Young's moduli.
COMPOSITES PART B-ENGINEERING
(2021)
Review
Materials Science, Composites
Huanbo Wang, Xuefeng Zhang, Shiyu Guo, Tian Liu
Summary: Coextruded wood-plastic composites (Co-WPCs) are multilayer composites that can overcome the drawbacks of WPCs by specific modifications to the composite surfaces. This review summarizes the studies of Co-WPCs, including their mechanical properties, moisture absorption, weathering, flame resistance, and dimensional stability, and presents expectations for further development.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Composites
Ricardo H. Cruz-Estrada, Javier Guillen-Mallette, Edgar J. Lopez-Naranjo, Edgar Zacarias-Calderon
Summary: This study investigated the impact of adding teak wood to recycled high-density polyethylene wood plastic composites with pine wood on their resistance to degradation caused by termite attack and accelerated weathering. The experiments showed that the presence of teak wood reduced weight loss and increased termite mortality in the composite. The manufacturing process of the composites promoted a heterogeneous distribution of wood particles with higher concentration in the center. Surface characterizations revealed chemical modification of the composite components.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yamei Zhang, Qin Lu, Yanglun Yu, Wenji Yu
Summary: This study investigates the sorption behaviors of bamboo fiber-based composites (BFC) with different compression ratios and proposes a sorption mechanism. The results show that the sorption ability of BFC increases with higher compression ratios, especially in high relative humidity environments. The introduction of phenolic formaldehyde resin and material densification can reduce water transfer pathways and absorption spaces. Therefore, relative humidity is a key factor in determining the optimal compression ratio of BFC.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
