Surface properties of in situ organo-montmorillonite modified wood flour and the influence on mechanical properties of composites with polypropylene

2016 ◽  
Vol 361 ◽  
pp. 234-241 ◽  
Author(s):  
Ru Liu ◽  
Wenjing Sun ◽  
Jinzhen Cao ◽  
Jiamin Wang
Keyword(s):  
Mechanical Properties ◽  
Surface Properties ◽  
Wood Flour ◽  
Modified Wood ◽  
Properties Of Composites

Role of Interfacial Interactions on Mechanical Properties of Biomimetic Composites for Bone Tissue Engineering

2005 ◽  
Vol 898 ◽  
Author(s):  
Devendra Verma ◽  
Rahul Bhowmik ◽  
Bedabibhas Mohanty ◽  
Dinesh R Katti ◽  
Kalpana S Katti
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Mechanical Response ◽  
Density Ratio ◽  
Interfacial Interactions ◽  
Porous Composites ◽  
Properties Of Composites

AbstractInterfaces play an important role in controlling the mechanical properties of composites. Optimum mechanical strength of scaffolds is of prime importance for bone tissue engineering. In the present work, molecular dynamics simulations and experimental studies have been conducted to study effect of interfacial interactions on mechanical properties of composites for bone replacement. In order to mimic biological processes, hydroxyapatite (HAP) is mineralized in presence of polyacrylic acid (PAAc) (in situ HAP). Further, solid and porous composites of in situ HAP with polycaprolactone (PCL) are made. Mechanical tests of composites of in situ HAP with PAAc have shown improved strain recovery, higher modulus/density ratio and also improved mechanical response in simulated body fluid (SBF). Simulation studies indicate potential for calcium bridging between –COO− of PAAc and surface calcium of HAP. This fact is also supported by infrared spectroscopic studies. PAAc modified surfaces of in situ HAP offer means to control the microstructure and mechanical response of porous composites. Nanoindentation experiments indicate that apatite grown on in situ HAP/PCL composites from SBF has improved elastic modulus and hardness. This work gives insight into the interfacial mechanisms responsible for mechanical response as well as bioactivity in biomaterials.

Enhancement of mechanical properties of composites made of calcium carbonate modified bamboo fibers and polypropylene

Holzforschung ◽  
2015 ◽  
Vol 69 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Haitao Cheng ◽  
Jie Gao ◽  
Ge Wang ◽  
Sheldon Q. Shi ◽  
Shuangbao Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Tensile Strength ◽  
Tensile Modulus ◽  
Inorganic Materials ◽  
Polypropylene Composites ◽  
Fiber Treatment ◽  
Bamboo Fibers ◽  
Properties Of Composites

Abstract The work aimed at the improvement of the mechanical properties of bamboo fiber-polypropylene composites (BaFPPC) by treatment of the fibers with CaCO3 at various concentrations of the solution (0.05, 0.1, 0.2, and 0.3 mol l-1). CaCO3 particles were successfully deposited in situ to bamboo fibers by means of ionic reaction of Na2 CO3 and CaCl2 aqueous solution at various temperatures. Then BaFPPC were produced, and various tests on single fibers and the composites were performed. The compatibility between BaF and PP matrix was improved by the treatments. The crystallinity of inorganic materials was significantly affected by the reagent’s concentration. A 10.4% increase in tensile strength and a 16.7% increase in tensile modulus were observed after fiber treatment with CaCO3 at a concentration of 0.2 mol l-1.

Physic-Mechanical Properties of Composites Based on Secondary Polypropylene and Dispersed of Plant Waste

2020 ◽  
Vol 1006 ◽  
pp. 227-232
Author(s):  
Yuliya Danchenko ◽  
Artem Kariev ◽  
Vladimir Lebedev ◽  
Elena Barabash ◽  
Tatyana Obizhenko
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Wood Flour ◽  
Chemical Properties ◽  
Uniform Structure ◽  
Internal Stresses ◽  
Agricultural Plants ◽  
Oat Husk ◽  
Filled Composite ◽  
Properties Of Composites

The physic-mechanical properties of filled composites based on secondary polypropylene are investigated. As fillers the dispersed wastes of processing of agricultural plants - buckwheat and oat husk, as well as needles flour and wood flour were used. Water absorption, abrasion, impact strength and bending strength of composites were investigated. It has been proven that oat and buckwheat husks can be effectively used in composites based on secondary polypropylene and replace traditional wood fillers. It has been shown that the physic-chemical properties of the filled composites depend on the structure and physicochemical interactions on the phase separation surface, as well as on the surface properties of the filler particles. It is established that for the production of filled composites with improved physic-mechanical characteristics it is necessary to use fillers with small specific surface and concentration of surface functional groups, and the acid-base characteristic of the surface should be closer to neutral. It is shown that these conditions provide for the formation of a uniform structure of the filled composite with less internal stresses.

Preparation and Properties of Wood Flour/HDPE Composites Using C5-g-MAH as Compatilizer

2013 ◽  
Vol 779-780 ◽  
pp. 170-173
Author(s):  
Lan Cen ◽  
Fu Lin Chen ◽  
You Ming Cao ◽  
Hui Xue Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Bend Strength ◽  
Grafting Ratio ◽  
Melt Grafting ◽  
Compatibilizing Effect ◽  
Morphology And Mechanical Properties ◽  
Properties Of Composites

Maleic anhydride grafted C5 petroleum resin (C5-g-MAH) was prepared using peroxide as an initiator by melt grafting process, and was incorporated as a compatibilizer into Wood Flour/High Density Polyethylene (WF/HDPE) composites. The effect of second monomers and C5-g-MAHs on the morphology and mechanical properties of composites was investigated. Results showed that the presence of a second monomer, Triallyl isocyanurate (TAI), Butyl acrylate (BA) or Trimethylol proane trimethacrylate (TMPTMA), in the grafting system gave rise to higher grafting ratio of C5-g-MAHs compared to that without a second monomer. The highest grafting ratio was obtained as TMPTMA content being 0.20~0.35wt% based on C5. The addition of C5-g-MAHs into WF/HDPE resulted in improved mechanical properties. Meanwhile the composite containing C5-g-MAH with 0.30wt% TMPTMA exhibits the most significant improvement in all mechanical properties with tensile strength and bend strength increasing up to 18% and 20% respectively, which is concomitant with the finer morphology structure observed by SEM, suggesting the remarkable compatibilizing effect of C5-g-MAH with TMPTMA for WF/HDPE composites.

scholarly journals Repeated Exposure of Nanostructured Titanium to Osteoblasts with Respect to Peri-Implantitis

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 697
Author(s):  
Vaclav Babuska ◽  
Jana Kolaja Dobra ◽  
Ludek Dluhos ◽  
Jana Dvorakova ◽  
Jana Moztarzadeh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Adhesion ◽  
Surface Properties ◽  
Surface Characterization ◽  
Titanium Surface ◽  
Human Osteoblast ◽  
Nanostructured Titanium ◽  
Angular Pressing ◽  
Optimal Surface

Titanium offers excellent biocompatibility and extraordinary mechanical properties. As a result, it is used as a material for dental implants. Implants infected by peri-implantitis can be cleaned for successful re-osseointegration. Optimal surface properties, such as roughness and wettability, have a significant impact on cell adhesion. The aim of this study was to evaluate the adhesion and proliferation of osteoblasts on the surface of repeatedly cleaned nanostructured titanium samples. Human osteoblast-like cells MG-63 were seeded on nanostructured titanium specimens manufactured from rods produced by the equal channel angular pressing. For surface characterization, roughness and wettability were measured. Cell adhesion after 2 h as well as cell proliferation after 48 h from plating was assessed. We have found that this repeated cleaning of titanium surface reduced cell adhesion as well as proliferation. These events depend on interplay of surface properties, such as wettability, roughness and topography. It is difficult to distinguish which factors are responsible for these events and further investigations will be required. However, even after the several rounds of repeated cleaning, there was a certain rate of adhesion and proliferation recorded. Therefore the attempts to save failing implants by using in situ cleaning are promising.

Study of Vinyltrimethoxysilane Modified Wood Flour/HDPE Composites

2011 ◽  
Vol 183-185 ◽  
pp. 2148-2153
Author(s):  
Chun Tao Li ◽  
Wei Hong Wang ◽  
Qing Wen Wang ◽  
Yan Jun Xie ◽  
Yong Ming Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Water Resistance ◽  
Wood Flour ◽  
Untreated Wood ◽  
Solution Concentration ◽  
Added Value ◽  
Grafting Reaction ◽  
Interfacial Compatibility ◽  
Modified Wood

Wood plastic composites (WPC) are a new type of green environmental composites with high performance and added value. In this paper, poplar wood flour was modified with vinyltrimethoxysilane(A-171) to improve the interfacial compatibility and enhance the interfacial bonding between the polar wood flour and nonpolar plastics. Then the modified wood flour was blended with high density polyethylene (HDPE) and prepared composites by extrusion. The effects of amount and solution concentration of A-171 on the properties of WPC were investigated. FTIR analysis indicated that polycondensation grafting reaction occurred between A-171 and wood flour. Compared to untreated wood flour/HDPE composites, both mechanical properties and water resistance of the composites were improved and presented optimal performance when the dosage of A-171 was 4%. The storage modulus G' and viscosity η*of the composites decreased but the loss tangent tanδ increased compared to the untreated composites. G' and η* raised with the increase of A-171, however, tanδ decreased. Solution concentration of A-171 did not show significant effect on the mechanical properties of composites, but water resistance of composites decreased with the increase of solution concentrateon of A-171.

scholarly journals Morphology and mechanical properties of polypropylene-wood flour composites

BioResources ◽  
2006 ◽  
Vol 1 (2) ◽  
pp. 209-219 ◽  
Author(s):  
D. Dobreva ◽  
S. Nenkova ◽  
St. Vasileva
Keyword(s):  
Mechanical Properties ◽  
Wood Flour ◽  
Tensile Tests ◽  
Mechanical Tests ◽  
Monochloroacetic Acid ◽  
X Ray Diffraction ◽  
Physical Strength ◽  
Positive Effects ◽  
Crystallization Degree ◽  
Modified Wood

The microstructure and mechanical properties of polymer composites based on polypropylene and wood flour modified with monochloroacetic acid were investigated. Scanning electron microscopy and wide-angle X-ray diffraction were used as methods to probe the composite microstructures, while the tensile test was used to measure the physical strength. The wood flour modification was performed at different levels of monochloroacetic acid, ranging from 0.01 to 1 mol, while the modified wood flour was used as filler for polypropylene at 10, 20 and 30 wt.-%. It was found that increasing the monochloroacetic acid fraction influences the microstructure of the composites and leads to more homogeneous products. The introduction of non-modified wood flour decreases the polypropylene crystallization degree, but it improves after introduction of monochloroacetic acid. Physical-mechanical tests showed positive effects on tensile tests and Charpy notched impact strength. The new composites appear to be promising materials for construction purposes.

The Influence of Diatomite Types and Compatibilizer Content on Properties of Diatomite-Wood Flour/Polypropylene Composites

2013 ◽  
Vol 448-453 ◽  
pp. 1363-1368 ◽  
Author(s):  
Ming Li Liu ◽  
Guo Zhi Han ◽  
Yan Long Liu ◽  
Chun Feng Li
Keyword(s):  
Mechanical Properties ◽  
Wood Flour ◽  
Flow Property ◽  
Wood Plastic Composite ◽  
Screw Extruder ◽  
Polypropylene Composites ◽  
Plastic Composite ◽  
Single Screw Extruder ◽  
Reinforcing Material ◽  
Properties Of Composites

Based on diatomite as modifier, maleic anhydride grafted polypropylene as compatibilizer, wood flour as reinforcing material, through single screw extruder, diatomite based wood plastic composite was prepared. The results show that: compared with one-grade-diatomite (OGD) and two-grade-diatomite (TGD), mechanical properties of the composites prepared by calcined diatomite (CD) are better, tensile strength and impact strength reached 46.9MPa and 20.1MPa. With respect to the diatomite types, it is more significant for the effects of MAPP mass on the mechanical properties of composites. The amount of MAPP was controlled in 4%, the mechanical properties of composites are better. The study of rheological properties showed that, the flow property of composites produced by calcined diatomite is better; the interface of the composite components is closer and more superior processability.

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