Tuning the interphase adhesion in high-density polyethylene-silica nanocomposites with ionic liquids

2019 ◽  
Vol 136 (17) ◽  
pp. 47366
Author(s):  
Katarzyna Z. Donato ◽  
Ricardo K. Donato ◽  
Alexander Zhigunov ◽  
Raquel S. Mauler ◽  
Henri S. Schrekker
Keyword(s):  
Ionic Liquids ◽  
High Density Polyethylene ◽  
High Density ◽  
Silica Nanocomposites

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.

Composition and Surface Topography Effects on Apatite-Forming Ability of Ceramic-Polymer Composites

2003 ◽  
Vol 774 ◽  
Author(s):  
Susan M. Rea ◽  
Serena M. Best ◽  
William Bonfield
Keyword(s):  
Surface Topography ◽  
High Density Polyethylene ◽  
High Density ◽  
Apatite Layer ◽  
Biologically Active ◽  
Human Blood Plasma ◽  
Apatite Formation ◽  
Polyethylene Matrix ◽  
Composite Surface ◽  
X Ray

AbstractHAPEXTM (40 vol% hydroxyapatite in a high-density polyethylene matrix) and AWPEX (40 vol% apatite-wollastonite glass ceramic in a high density polyethylene matrix) are composites designed to provide bioactivity and to match the mechanical properties of human cortical bone. HAPEXTM has had clinical success in middle ear and orbital implants, and there is great potential for further orthopaedic applications of these materials. However, more detailed in vitro investigations must be performed to better understand the biological interactions of the composites and so the bioactivity of each material was assessed in this study. Specifically, the effects of controlled surface topography and ceramic filler composition on apatite layer formation in acellular simulated body fluid (SBF) with ion concentration similar to those of human blood plasma were examined. Samples were prepared as 1 cm × 1 cm × 1 mm tiles with polished, roughened, or parallel-grooved surface finishes, and were incubated in 20 ml of SBF at 36.5 °C for 1, 3, 7, or 14 days. The formation of a biologically active apatite layer on the composite surface after immersion was demonstrated by thin-film x-ray diffraction (TF-XRD), environmental scanning electron microscopy (ESEM) imaging and energy dispersive x-ray (EDX) analysis. Variations in sample weight and solution pH over the period of incubation were also recorded. Significant differences were found between the two materials tested, with greater bioactivity in AWPEX than HAPEXTM overall. Results also indicate that within each material the surface topography is highly important, with rougher samples correlated to earlier apatite formation.

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