Influence of eco-friendly pretreatment of lignocellulosic biomass using ionic liquids on the interface adhesion and characteristics of polymer composite boards

2020 ◽  
Vol 54 (25) ◽  
pp. 3717-3729 ◽  
Author(s):  
Behzad Kord ◽  
Farnaz Movahedi ◽  
Laleh Adlnasab ◽  
Hassan Masrouri
Keyword(s):  
Ionic Liquids ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Treated Wood ◽  
Interfacial Strength ◽  
Untreated Wood ◽  
High Density ◽  
Interfacial Behavior ◽  
Higher Temperature ◽  
Tan Δ

In this investigation, the effect of ionic liquids (ILs) pretreatment on the interfacial behavior, physical, and thermal properties of compression-molded composite boards produced from wood flour and high-density polyethylene was studied. Firstly, wood flour was pretreated with with two types of synthesized ILs, namely 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride (IL-Cl) and 1-(3-trimethoxysilylpropyl)-3-methylimidazolium thiocyanate (IL-SCN). Thereafter, the interfacial strength, weight loss, water absorption, and thickness swelling of the specimens prepared from untreated and ILs-treated were evaluated. Further, the chemical treatment of wood flour with ILs was tracked by Fourier transform infrared spectroscopy. The morphological aspects of the specimens were characterized using Field Emission Scanning Electron Microscope (FESEM). Results demonstrated that the strong interaction between the wood flour and high-density polyethylene occurred in the presence of ILs pretreatment, which corresponded with the minimum amounts of adhesion factor. The tan δ peak was shifted to higher temperature for the modified samples than unmodified ones. It was noted that thermal stability of the composite boards improved as a result of ILs pretreatment. The residual weight in temperature of 600℃ was increased to 21.09% and 17.28% for the composite panels made from IL-SCN- and IL-Cl-treated wood, respectively, as compared to a residual mass of 16.35% for the composite based on untreated wood. Furthermore, physical testing revealed that the specimens produced from ILs-treated wood exhibited superior water resistance and dimensional stability compared to that of untreated ones.

Effect of bark flour on viscoelastic behavior of high density polyethylene

2010 ◽  
Vol 45 (9) ◽  
pp. 1007-1016 ◽  
Author(s):  
Kamini Sewda ◽  
S.N. Maiti
Keyword(s):  
Storage Modulus ◽  
High Density Polyethylene ◽  
Volume Fraction ◽  
Viscoelastic Behavior ◽  
Peak Shift ◽  
High Density ◽  
Mechanical Restraint ◽  
Higher Temperature ◽  
Tan Δ ◽  
Damping Peak

The dynamic mechanical behavior of high density polyethylene (HDPE) in HDPE/bark flour (BF) composites on varying the volume fraction (Φf) of BF (filler) from 0 to 0.26 has been studied. The storage modulus decreases with increase in BF content up to Φf = 0.07, which is attributed to a pseudolubricating effect by the filler. The storage modulus for the composites at Φ f = 0.20 is higher than HDPE in all other temperature zones due to enhanced mechanical restraint by the dispersed phase. At Φf = 0.07, the loss moduli were either marginally lower or similar to that of HDPE, which is due to the ball-bearing effect of the filler as well as decrease in the crystallinity of HDPE. Above Φf = 0.07, the loss moduli were higher than HDPE. The α-relaxation region of the damping peak shifted toward the higher temperature side with increase in BF content. In the presence of the coupling agent, maleic anhydride-grafted HDPE (HDPE-g-MAH), the storage modulus values were marginally lower than those of the HDPE/BF systems. In the HDPE/BF/HDPE—g—MAH composites, the variations of the loss moduli were similar but values lower than those of the HDPE/BF systems. Damping peak shift in the α-region toward higher temperature was more than those of the HDPE/BF systems, which may be due to the hindrance to the relaxation due to an enhanced phase interaction. The values of tan δ were higher than the rule of mixture for both the composites.

scholarly journals Heat-Treated Wood Reinforced High Density Polyethylene Composites

2021 ◽  
Vol 72 (3) ◽  
pp. 219-229
Author(s):  
Kadir Karakuş ◽  
Deniz Aydemir ◽  
Gokhan Gunduz ◽  
Fatih Mengeloğlu
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Tensile Modulus ◽  
Treated Wood ◽  
High Density ◽  
Black Pine ◽  
Sem Images ◽  
Pine Wood ◽  
Heat Treated

This study investigated the effect of untreated and heat-treated ash and black pine wood flour concentrations on the selected properties of high density polyethylene (HDPE) composites. HDPE and wood flour were used as thermoplastic matrix and filler, respectively. The blends of HDPE and wood fl our were compounded using single screw extruder and test samples were prepared through injection molding. Mechanical properties like tensile strength (TS), tensile modulus (TM), elongation at break (EatB), fl exural strength (FS), fl exural modulus (FM) and impact strength (IS) of manufactured composites were determined. Wood fl our concentrations have significantly increased density, FS, TM and FM and hardness of composites while reducing TS, EatB and IS. Heat-treated ash and black pine fl our reinforced HDPE composites had higher mechanical properties than untreated ones. Composites showed two main decomposition peaks; one coming from ash wood flour (353-370 °C) and black pine wood fl our (373-376 °C), the second one from HDPE degradation (469-490 °C). SEM images showed improved dispersion of heat-treated ash and black pine wood flour. The obtained results showed that both the untreated and heat-treated ash/black pine wood flour have an important potential in the manufacture of HDPE composites.

scholarly journals Chemical Modifications of Continuous Aramid Fiber for Wood Flour/High-Density-Polyethylene Composites with Improved Interfacial Bonding

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 236
Author(s):  
Wanyu Liu ◽  
Yue Li ◽  
Shunmin Yi ◽  
Limin Wang ◽  
Haigang Wang ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Wood Flour ◽  
Tensile Modulus ◽  
High Density ◽  
Aramid Fiber ◽  
Chemical Modifications ◽  
Plastic Composites ◽  
Vinyl Triethoxysilane ◽  
Extrusion Method ◽  
Polyethylene Composites

To expand the use of wood plastic composites in the structural and engineering constructions applications, continuous aramid fiber (CAF) with nondestructive modification was incorporated as reinforcement material into wood-flour and high-density-polyethylene composites (WPC) by extrusion method with a special die. CAF was treated with dopamine (DPA), vinyl triethoxysilane (VTES), and DPA/VTES, respectively. The effects of these modifications on compatibility between CAF and WPCs and the properties of the resulting composites were explored. The results showed that compared with the original CAF, the adhesion strength of DPA and VTES combined modified CAF and WPCs increased by 143%. Meanwhile, compared with pure WPCs, CAF after modification increased the tensile strength, tensile modulus, and impact strength of the resulting composites by 198, 92, and 283%, respectively.

Effects of Various Types of Modified Nanoclay on The Physical, Mechanical, and Viscoelastic Characteristics of Lignocellulosic Filler-Reinforced PVC Composites

2021 ◽  
Author(s):  
Mohammad Dahmardeh Ghalehno ◽  
Behzad Kord ◽  
Laleh Adlnasab
Keyword(s):  
Wood Flour ◽  
Dynamic Mechanical Properties ◽  
Clay Nanoparticles ◽  
Plastic Composites ◽  
Different Types ◽  
Higher Temperature ◽  
Viscoelastic Characteristics ◽  
Tan Δ ◽  
Lignocellulosic Filler ◽  
Double Hydroxide

Abstract The objective of this research was to comprehensively compare the effects of two different types of nanoclay, namely layered double hydroxide (LDH) and halloysite nanotube (HNT) on the physical, mechanical, and dynamic mechanical properties of compression-molded composite panels fabricated from wood flour (WF) and polyvinyl chloride (PVC). To achieve the desired properties in the composites, the clay nanoparticles were modified with surfactant (mLDH and mHNT) before usage. The results showed that the composite specimens with mLDH exhibited higher tensile and flexural properties (strength and moduli) than with mHNT at low content. However, at high content, the composite specimens with mHNT presented greater hydrophobicity. The DMTA results indicated that the composite specimens with mLDH demonstrated better molecular restriction and larger storage modulus than with mHNT. Besides, the loss-tangent (tan δ) peak was shifted to a higher temperature for the samples including both mLDH and mHNT than without ones. Morphological observations showed that the nanoparticles were predominantly dispersed uniformly within the polymer matrix. Overall, it is found that the addition of 3 phc mLDH clay was the most effective in the composite formulation; it has significantly enhanced the properties of the wood-plastic composites.

Research on Plastic Wood Composite Materials Production Technology

2012 ◽  
Vol 182-183 ◽  
pp. 274-277
Author(s):  
Fang Huang
Keyword(s):  
Composite Material ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Wood Fiber ◽  
Waste Recycling ◽  
High Density ◽  
Natural Material ◽  
Wood Composite ◽  
Polyethylene Composite ◽  
Environmental Material

Wood flour is inexpensive, and can be used as a reinforcing agent to improve the mechanical properties of high density polyethylene, reduce cost. Wood fiber as a renewable natural material, biodegradation, therefore, high filling wood powder high density polyethylene composite material with certain environmental compatibility, at the same time, high density polyethylene can be a source of waste recycling materials, therefore plastic-wood composite material is a kind of can reduce the "white pollution" environmental material. [1-5]

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