Enhancement of the properties of hybrid woods polymer composites by chemical pre-treatments

2020 ◽  
pp. 146442072098003
Author(s):  
Mohammad ZR Khan ◽  
Sunil Kumar Srivastava ◽  
MK Gupta
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Water Resistance ◽  
Treated Wood ◽  
Wood Composites ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Shorea Robusta ◽  
Wood Particles ◽  
Maximum Water

The present work aims to enhance the mechanical properties, thermal stability, and water resistance behavior of hybrid Pinus/Shorea robusta wood particles reinforced epoxy composites employing the chemical pre-treatments. The hybrid wood composites were prepared by hand lay-up method keeping a constant of 25 wt% of wood particles concentration with equal proportions of Pinus and Shorea robusta wood particles. The performance of the hybrid wood composite was improved by improving the interfacial bonding between wood particles and epoxy resin by chemical pre-treatments of the wood particles using silane (APTES) with varying concentrations of 2, 4, and 6 wt% and alkali (NaOH) with varying concentrations of 5%, 10%, and 15%. The mechanical properties (namely, tensile, flexural, impact, and microhardness) and water absorption properties (namely, maximum water uptake and sorption, diffusion, and permeability coefficients) of the prepared hybrid wood composites were measured. The investigations include the study of thermal degradation and crystalline behavior using thermogravimetric analysis and X-ray diffraction analysis, respectively. It was observed that the mechanical properties, thermal stability, and water resistance and crystalline behavior of the hybrid wood composites were significantly enhanced after these pre-treatments. Further, it was concluded that silane pre-treated hybrid composite with 6 wt% concentration provided the best performance than untreated as well as alkali pre-treated wood composites.

scholarly journals Enhanced mechanical properties, water resistance, thermal stability, and biodegradation of the starch-sisal fibre composites with various fillers

2021 ◽  
Vol 198 ◽  
pp. 109373
Author(s):  
Maocheng Ji ◽  
Fangyi Li ◽  
Jianyong Li ◽  
Jianfeng Li ◽  
Chuanwei Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Water Resistance ◽  
Sisal Fibre ◽  
Fibre Composites

scholarly journals Bio-Based Thermoplastic Starch Composites Reinforced by Dialdehyde Lignocellulose

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3236
Author(s):  
Peng Yin ◽  
Wen Zhou ◽  
Xin Zhang ◽  
Bin Guo ◽  
Panxin Li
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Water Resistance ◽  
Thermoplastic Starch ◽  
Contact Angles ◽  
Sem Images ◽  
Elongation At Break ◽  
Injection Process ◽  
Oxidation Damage

In order to improve the mechanical properties and water resistance of thermoplastic starch (TPS), a novel reinforcement of dialdehyde lignocellulose (DLC) was prepared via the oxidation of lignocellulose (LC) using sodium periodate. Then, the DLC-reinforced TPS composites were prepared by an extrusion and injection process using glycerol as a plasticizer. The DLC and LC were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the effects of DLC content on the properties of the DLC/TPS composites were investigated via the evaluation of SEM images, mechanical properties, thermal stability, and contact angles. XRD showed that the crystallinity of the DLC decreased due to oxidation damage to the LC. SEM showed good dispersion of the DLC in the continuous TPS phase at low amounts of DLC, which related to good mechanical properties. The tensile strength of the DLC/TPS composite reached a maximum at a DLC content of 3 wt.%, while the elongation at break of the DLC/TPS composites increased with increasing DLC content. The DLC/TPS composites had better thermal stability than the neat TPS. As the DLC content increased, the water resistance first increased, then decreased. The highest tensile strength and elongation at break reached 5.26 MPa and 111.25%, respectively, and the highest contact angle was about 90.7°.

The properties of sericin/poly(vinyl alcohol) films modified by boric acid

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Qun Wang ◽  
Lu Qi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boric Acid ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Blend Ratio ◽  
Percutaneous Drug Delivery ◽  
Thermal Stability Of

AbstractA group of films mainly composed of sericin and poly(vinyl alcohol) (PVA), using boric acid (BA) as a modifier, were prepared by a technique of solution casting. In this work, the effect of BA and sericin on the mechanical properties and water resistance of the films was analyzed, the interior morphology of the films were described by a scanning electron microscopy (SEM), the thermal stability of the films was characterized by differential scanning calorimetry (DSC), and the reaction mechanism was proposed according to the previous literature and the test of Fourier transform infrared spectrum (FTIR). Results indicated that, the properties of the membrane were the functions of the blend ratio of sercin to PVA and the content of BA. The use of BA increased the tensile strength, improved the water resistance and the thermal stability, and varied the interior morphology of the films. The content of sericin greatly influenced the combination of properties of the films, especially the mechanical properties, interior morphology, thermal stability, and water resistance reducing with the increasing of sericin content. The films have potential to be used in materials, such as skin-care coatings for beauty, percutaneous drug delivery systems for exterior intact skin, due to the characteristics of the components and the good mechanical properties of the films.

Enhancing mechanical properties of particleboards using plasma treated wood particles

2015 ◽  
Vol 73 (2) ◽  
pp. 219-223 ◽  
Author(s):  
Daniela Altgen ◽  
Martin Bellmann ◽  
Richard Wascher ◽  
Wolfgang Viöl ◽  
Carsten Mai
Keyword(s):  
Mechanical Properties ◽  
Treated Wood ◽  
Wood Particles

scholarly journals Investigation on mechanical properties and water absorbency of jute glass reinforced epoxy composite

2020 ◽  
Vol 6 (5) ◽  
Author(s):  
Md. Koushic Uddin ◽  
Muksit Ahmed Chowdhury ◽  
Sonia Hossain ◽  
Md Zahidul Islam ◽  
Mohammad Shamim Sardar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Resistance ◽  
Epoxy Composite ◽  
Natural Fibers ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Absorption Properties ◽  
Synthetic Fibers ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

Fiber reinforced composite materials are attractive because of their properties such as high toughness, water resistance and can be adapted to meet the specific needs of a variety of applications. Incorporation of natural fibers can reduce the dependency over synthetic fibers. In this work, Jute glass fiber reinforced composites are fabricated by simple hand lay-up technique using epoxy resin as a matrix and various mechanical properties like tensile strength, flexural strength, impact strength and also the water absorption properties of the composite specimens are evaluated and analysed thoroughly. It is observed that incorporation of optimum amount of jute fibre with glass fibre improved mechanical properties can be achieved. Finally cost of composites are analysed and compared.

Extrusion of MOC-Based Panel

2008 ◽  
Vol 400-402 ◽  
pp. 263-267
Author(s):  
Xiang Yu Li ◽  
Hui Su Chen ◽  
Chung Kong Chau ◽  
Zong Jin Li
Keyword(s):  
Mechanical Properties ◽  
Cross Sections ◽  
Chloride Solution ◽  
Extrusion Process ◽  
Wood Composites ◽  
Magnesium Chloride Solution ◽  
Wood Particles ◽  
Magnesium Oxychloride ◽  
Magnesium Oxychloride Cement ◽  
Extrusion Technology

Magnesium Oxychloride Cement (MOC) is an air-hardened material with chemical reaction between magnesium oxide and magnesium chloride solution. It has many properties superior to Portland cement. It does not need wet curing, has very good fire resistance, low thermal conductivity. In this study, wood composites were developed by using MOC as binder and wood powders as filler. It was demonstrated that MOC was suitable for binding wood particles in large quantities. In order to ensure smooth extrusion process, additives and rheological modifiers were used to modify the rheology behaviors and properties of the mixture and the rheology behaviors of fresh materials were also investigated with upsetting and relaxation tests simultaneously. Then MOC-based panels with different cross-sections were produced by using extrusion technology and mechanical properties of them were investigated.

scholarly journals Paraffin Pickering Emulsion Stabilized with Nano-SiO2 Designed for Wood Impregnation

Forests ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 726
Author(s):  
Runhao Liu ◽  
Xinyao Liu ◽  
Yuting Zhang ◽  
Junjia Liu ◽  
Chengxi Gong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Storage Stability ◽  
Treated Wood ◽  
High Water ◽  
Pickering Emulsion ◽  
Special Equipment ◽  
Nano Sio2 ◽  
Wood Impregnation ◽  
Thermal Stability Of

Wax impregnation is an effective approach to improve wood water resistance. However, melted waxes require special equipment and cannot penetrate deep enough into wood. Recently, wax emulsions show excellent efficiency in wood modification. In this study, paraffin Pickering emulsion stabilized by low dispersed SiO2 nanospheres was used to impregnate poplar wood. The microstructure and storage stability of the emulsion were evaluated. The dimensional stability, water uptake, wettability, and thermal stability of treated wood were also investigated. After homogenization, a milk-white oil-in-water (O/W) paraffin Pickering emulsion stabilized by the nano-SiO2 (diameter of ~76 nm) was formed and demonstrated excellent storage stability. Paraffin Pickering emulsion could penetrate into the wood structure. The emulsion-treated wood was endowed with a moderate anti-swelling efficiency (ASE), high water resistance, and low wettability. Moreover, the addition of nano-SiO2 could improve the thermal stability of the treated wood.

scholarly journals Improvement of water resistance and mechanical properties of fast-growing poplar with bio-based isobornyl methacrylate monomer

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 2356-2370
Author(s):  
Ji Xu ◽  
Zhaolan Zhai ◽  
Xingyan Yan ◽  
Zhanqian Song ◽  
Shibing Shang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Resistance ◽  
In Situ Polymerization ◽  
Forest Tree ◽  
Ethanol Solution ◽  
Modulus Of Rupture ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Fast Growing ◽  
Methacrylate Monomer

Fast-growing poplar has become an extensively planted fast-growing forest tree species because of its short plantation rotation, lightweight character, and strong adaptability. However, fast-growing poplar usually exhibits some disadvantageous properties, such as inferior mechanical properties, high hygroscopicity, and poor dimensional stability, which limits its applications to a great extent. Herein, a simple method for improving the water resistance and mechanical properties of fast-growing poplar wood using the biobased monomer isobornyl methacrylate (IBOMA) was investigated. Wood/PIBOMA composites were prepared by impregnating the wood matrix with IBOMA ethanol solution, and then the IBOMA in the wood matrix was heated to initiate in situ polymerization. Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) were used to investigate the properties of fast-growing wood/PIBOMA composites. The results showed that the IBOMA successfully penetrated the wood structure and polymerized in the cell walls and cell lumens. Thereby, the water resistance and mechanical properties of the fast-growing poplar were effectively improved. In addition, the water uptake of the wood decreased from 168.3% to 35.8% after impregnation with the 90% IBOMA solution. The modulus of rupture (MOR), modulus of elasticity (MOE), and compression strength (CS) of the 90% wood/PIBOMA composites were increased by 82.7, 28.6, and 2.3%, respectively.

Water absorption behavior of heat-treated and untreated red balau saw dust/LDPE composites: Its kinetics and effects on mechanical properties

2018 ◽  
Vol 32 (10) ◽  
pp. 1408-1426 ◽  
Author(s):  
Ruth A Lafia-Araga ◽  
Aziz Hassan ◽  
R Yahya ◽  
N Abd Rahman ◽  
Fauzani Md Salleh
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Water Absorption ◽  
Water Immersion ◽  
Treated Wood ◽  
Untreated Wood ◽  
Thermoplastic Composites ◽  
Wood Composites ◽  
Saw Dust ◽  
Heat Treated

The hygroscopic nature of wood limits the use of wood thermoplastic composites (WTC) in outdoor industrial and domestic applications. To reduce this tendency, red balau saw dust was heat treated at 180 and 200°C for 1 h and compounded with Low Density Poly(ethylene) (LDPE) into 20 and 37 wt% and then molded into test specimens by injection molding. Samples were immersed in distilled water at room temperature for 4 months. Heat-treated wood composites showed remarkable water resistance relative to untreated ones. Wood composites made from wood treated at 180 and 200°C exhibited almost similar water absorption pattern. Reduced water absorption of heat-treated wood composites relative to untreated ones indicates that heat treatment has resulted in a degree of modification of the wood. Most of the composites displayed the Fickian mode of water absorption with n values close to 0.5. Also, the diffusion coefficient reduced with wood content in untreated wood composites due to interaction of water with the polar groups in wood through hydrogen bonding. Untreated wood composites exhibited poorer mechanical properties with water immersion as a result of degradation due to moisture. The mechanical properties of the heat-treated wood composites were not adversely affected with water absorption. Therefore, heat treatment can reduce the proneness to water absorption in WTCs and alleviate the detrimental effects on mechanical properties.

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