scholarly journals Effect of particle size, shape, and weight percentage of hydroxyapatite (HA) on rheological behaviour of polycaprolactone/hydroxyapatite (PCL/HA) composites

2021 ◽  
Vol 4 (2) ◽  
pp. 132
Author(s):  
Zulaisyah Laja Besar ◽  
Suffiyana Akhbar
Keyword(s):  
Particle Size ◽  
Rheological Behaviour ◽  
Melt Flow Index ◽  
Flow Index ◽  
Weight Percentage ◽  
Single Screw Extruder ◽  
Weight Content ◽  
Varied Temperature ◽  
Similar Content ◽  
Effect Of Particle Size

The aim of this study is to investigate the influence of hydroxyapatite’s (HA) particle size, shape, and variation of HA weight percentage on the rheological behaviour of polycaprolactone/hydroxyapatite (PCL/HA) composite. The composite was produced by melt blending process using a single screw extruder assisted with an ultrasonic wave with varied HA weight content (0 wt.%, 10 wt.%, 20 wt.%, 30 wt.% and 40 wt.%). Two types of HA were used, which are needle shape (HAN) and irregular shape (HAS). The rheological behaviour of the PCL/HA composite was investigated through the melt flow index (MFI) test at a varied temperature of 100, 110, and 120 °C. The result indicated that an increase of HA content decreases the MFI values of the PCL/HA composite. At similar content of HA, PCL/HAN composite has higher activation energy with lower MFI values compared to PCL/HAS composite. In conclusion, this study concluded that the particle size, shape, and weight percentage of HA significantly affect the rheological behaviour of PCL/HA composites.

The Effect of Particle Size Distribution of Lime on Properties of the Autoclaved Calcium Hydrosilicate Materials

2017 ◽  
Vol 908 ◽  
pp. 29-34
Author(s):  
Dana Kubátová ◽  
Martin Boháč
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Rheological Behaviour ◽  
Deionized Water ◽  
Hydrothermal Conditions ◽  
Slaked Lime ◽  
Effect Of Particle Size ◽  
Calcium Hydrosilicate

This investigation was made to examine how the particle size of lime influence the properties of calcium hydrosilicate materials. Quicklime was sorted in three fractions: 0-1 mm, 1-11.2 mm and 11.2.-22.4 mm. Slaked lime putties were prepared in the laboratory by mixing lime fractions and deionized water under vigorous stirring. The C/H ratio was 1:8. The lime putties were mixed with finely ground sand with the C/S ratio equal to 0.85. The hydrosilicate materials were prepared under hydrothermal conditions: temperature 205 °C, pressure 16 bar. This work focuses on lime putty rheological behaviour and on composition and properties of lime hydrosilicates. It was found that hydrated particles of fractionated lime form smaller aggregates than standard lime. Plasticity increases with the increasing size of fraction. When separate fractions are used, 11.3 Å tobermorite crystallization is slower.

Binder System for Coarse Powders Processed by Metal Injection Molding (MIM)

2008 ◽  
Vol 591-593 ◽  
pp. 169-173
Author(s):  
A.P.G. Nogueira ◽  
Ricardo Machado ◽  
Paulo A.P. Wendhausen ◽  
Diego Fernando Portaluppi
Keyword(s):  
Particle Size ◽  
Injection Molding ◽  
Dimensional Accuracy ◽  
Melt Flow Index ◽  
Metal Injection Molding ◽  
Flow Index ◽  
Binder System ◽  
Sintered Part ◽  
Dimensional Deviation ◽  
Modified Binder

Research on determined alloys produced by metal injection molding has been done for cost reduction purposes through the use of powders with bigger particle size. However, regarding feedstock homogeneity, certain limitations are presented when coarse particles are used. For instance, homogeneity strongly influences rheological behavior of the feedstock and dimensional control of the sintered part. Therefore, the purpose of this work was to evaluate effectiveness of a modified binder system with the addition of a surfactant polymer which makes the feedstock more homogeneous. This study was carried out on a FeNiP alloy currently processed by MIM, where 50%wt of the iron powder was replaced with course powder having a particle size distribution of D90 less than 47 ,m. Effectiveness of binder systems using a Melt Flow Index (MFI) and the behavior of dimensional accuracy at sintered part were analyzed. Results showed more feedstock homogeneity and less dimensional deviation when a surfactant agent was used.

scholarly journals Effect of Ground Tire Rubber (GTR) Particle Size and Content on the Morphological and Mechanical Properties of Recycled High-Density Polyethylene (rHDPE)/GTR Blends

Recycling ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 44
Author(s):  
Ali Fazli ◽  
Denis Rodrigue
Keyword(s):  
Particle Size ◽  
Thermal Properties ◽  
High Density Polyethylene ◽  
Thermoplastic Elastomer ◽  
Melt Flow Index ◽  
Mechanical Analysis ◽  
Particle Dispersion ◽  
High Density ◽  
Flow Index ◽  
The Matrix

This work investigates the effect of ground rubber tire (GRT) particle size and their concentration on the morphological, mechanical, physical, and thermal properties of thermoplastic elastomer (TPE) blends based on recycled high-density polyethylene (rHDPE). In our methodology, samples are prepared via melt blending (twin-screw extrusion followed by compression molding) to prepare different series of blends using GTR with three different particle sizes (0–250 μm, 250–500 μm, and 500–850 μm) for different GTR concentrations (0, 20, 35, 50, and 65 wt.%). The thermal properties are characterized by differential scanning calorimeter (DSC), and the morphology of the blends is studied by scanning electron microscopy (SEM). The mechanical and physical properties of the blends are investigated by quasi-static tensile and flexural tests, combined with impact strength and dynamic mechanical analysis (DMA). The SEM observations indicate some incompatibility and inhomogeneity in the blends, due to low interfacial adhesion between rHDPE and GTR (especially for GTR > 50 wt.%). Increasing the GTR content up to 65 wt.% leads to poor interphase (high interfacial tension) and agglomeration, resulting in the formation of voids around GTR particles and increasing defects/cracks in the matrix. However, introducing fine GTR particles (0–250 μm) with higher specific surface area leads to a more homogenous structure and uniform particle dispersion, due to improved physical/interfacial interactions. The results also show that for a fixed composition, smaller GTR particles (0–250 μm) gives lower melt flow index (MFI), but higher tensile strength/modulus/elongation at break and toughness compared to larger GTR particles (250–500 μm and 500–850 μm).

scholarly journals Investigation of Dynamic, Mechanical, and Thermal Properties of Calotropis procera Particle-Reinforced PLA Biocomposites

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
K. Yoganandam ◽  
Vigneshwaran Shanmugam ◽  
A. Vasudevan ◽  
D. Vinodh ◽  
N. Nagaprasad ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Heat Dissipation ◽  
Melt Flow Index ◽  
Calotropis Procera ◽  
Flow Index ◽  
Injection Molding Process ◽  
Mechanical And Thermal Properties ◽  
Molding Process ◽  
Weight Percentage ◽  
Dynamic Mechanical

The thermal behavior of the biodegradable Calotropis procera (CP) particle-reinforced polylactic acid (PLA) biocomposites was investigated. The injection molding process was used to make the composites, and the CP particle weight percentage was varied during the process (0%, 5%, 10%, 15%, and 20%). The melt flow index, heat deflection temperature, Vicat softening point, and the thermal properties of the composites were determined using dynamic mechanical testing. The results were analyzed and compared to the thermal properties of the neat PLA. The results revealed the increase in thermal stability of the PLA due to the addition of CP particles. The CP particles aided in the restriction of polymer mobility, which elevated the glass transition temperature of the composite. Incorporating CP particles in the PLA can increase the PLA/CP composite utilization in heat dissipation applications.

Electrical and mechanical properties of phenoxy/multiwalled carbon nanotubes multifilament yarn processed by melt spinning

2012 ◽  
Vol 82 (20) ◽  
pp. 2106-2115 ◽  
Author(s):  
Jonas Bouchard ◽  
Aurélie Cayla ◽  
Vincent Lutz ◽  
Christine Campagne ◽  
Eric Devaux
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Melt Spinning ◽  
Rheological Behaviour ◽  
Melt Flow Index ◽  
Flow Index ◽  
Electrical Measurements ◽  
Multiwalled Carbon ◽  
Multifilament Yarn

Nanocomposites based on Poly ((hydroxy ether) of bisphenol A) (Phenoxy) filled with multiwalled carbon nanotubes has been prepared by extrusion. Rheological behaviour and thermal degradation of these nanocomposites have been studied by melt flow index and thermogravimetric analysis. The results show that the addition of carbon nanotubes up to 2wt% increases the viscosity but does not modify significantly the spinnability of the compounds. Moreover, incorporation of these nanofillers allows an improvement of the thermal decomposition. In a second step, these nanocomposites have been processed by melt spinning to produce multifilament yarn. Transmission electron microscopy observations have been done to study carbon nanotubes dispersion and orientation. Nanocomposite morphology correlated with electrical measurements reveal an electrical percolation around 1.5 wt.% without decreasing significantly mechanical properties.

scholarly journals Effect of Particle Size and its Distribution on Rheological Behaviour of Coal-Water Slurry

2018 ◽  
Vol 7 (4.5) ◽  
pp. 73 ◽  
Author(s):  
Ganeswar Sahoo ◽  
Anupama Routray ◽  
Mamata Kumari Padhy ◽  
P. K. Senapati
Keyword(s):  
Particle Size ◽  
Shear Stress ◽  
Coal Sample ◽  
Rheological Behaviour ◽  
Low Rank ◽  
Water Slurry ◽  
Lower Viscosity ◽  
Coal Water Slurry ◽  
Effect Of Particle Size ◽  
The Stability

An experimental investigation has been conducted to study the rheological behaviour of coal-water slurry (CWS) of low rank coal. Different samples have been prepared by pulverizing it to powder form.  Bi-modal and mono-modal samples have been prepared separately. Thereafter slurry was prepared by adding distilled water to the sample. CWS of different coal concentration have been prepared with particle size from 37 µm to 250 µm. The rheological behaviour of both mono-modal and bi-modal slurry have been investigated with help of HAAKE RHEO STRESS 1, a thermo scientific rheometer. Comparing the rheological behaviour of CWS prepared from bi-modal sample and mono-modal sample, it is observed that CWS from bimodal exhibit lower viscosity and shear stress compare to mono-modal sample. The stability of slurry prepared from bi-modal samples are found to be poor than mono-modal samples. The stability of coal sample below 75µm at different concentration has also been investigated. Also the characterization of coal sample has been done. It is observed that as the ratio of coarse particle decreases the shear stress and viscosity also decreases.  

Experimental Investigating the Impact of Ionic Liquid on PET’s Properties

2018 ◽  
Author(s):  
Waleed K. Ahmed
Keyword(s):  
Ionic Liquid ◽  
Thermo Gravimetric Analysis ◽  
Melt Flow Index ◽  
Nanoindentation Test ◽  
Flow Index ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Weight Percentage ◽  
Mixing Ratios ◽  
The Impact

This study presents an experimental laboratory investigation done on the Polyethylene terephthalate – PET that is used for food grade (water bottle) by mixing with ionic liquid. Both thermal and mechanical properties with a varying weight percentage of ionic liquid are investigated. Mainly, at different mixing ratios of PET-Ionic liquid of (2, 3, 5, 7 and 10%), impact of the ionic liquid on the characteristics of the PET are examined through MFI (melt flow index), differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA), nanoindentation methods as well as Fourier Transform Infrared (FTIR) spectroscopy. In general, the estimated results indicated that the stiffness as well as the hardness acquired from nanoindentation test for the PET blends, decrease as long as the concentration increases.

scholarly journals Influence of the Yttria and Graphite Particles on the same of Al 2024 Alloy Properties

2019 ◽  
Vol 26 (4) ◽  
pp. 1-7
Author(s):  
Raed Razooqi ◽  
Ahmed Akbar ◽  
Mohanad Hamada
Keyword(s):  
Particle Size ◽  
Wear Rate ◽  
Bulk Density ◽  
Mean Value ◽  
Metal Powders ◽  
Micro Hardness ◽  
Weight Percentage ◽  
Weight Content ◽  
Al 2024 ◽  
Composite Samples

Powders have been mixed as (Al with 99% purity ≤53µm particle size, Cu with 99.5% purity ≤53µm particle size, Mg with 99.5% purity ≤53µm particle size, Y2O3 with 99.9% purity ≤53µm particle size, Gr with 99.9% purity ≤53µm particle size). one set of composite samples was prepared by addition (3wt%Gr) to metal powders shown above. For the each sample of composite varying (Y2O3) weight percentage as: (Al 2024-3wt%Gr-XY2O3) was added x=(0,2,4,6,8)(wt%) the other set of composite was in opposite. Well mixed samples was pressed uniaxial with (700Mpa) and (30sec). the compacted samples were sintered at (6000C) for (2hr). Results have shown an increase in bulk density by (5.3%) for (Al 2024-3wt% Gr-XY2O3) with the increase of reinforcement until (8wt%) of (Y2O3), while bulk density have been reduced for (Al 2024-3wt%Y2O3-XGr) with (5%) with the increase of (Gr) weight content in the composite. An increase in real porosity was noticed with the increase of (Y2O3) with (8wt%) (11.9%) for (Al 2024-3wt%Gr-XY2O3) but this was less in comparison with (Al 2024-3wt%Y2O3-XGr) were porosity increase with the increase of (Grwt%) up to reduced (18.5%) at (8wt%Gr).Mean value was of micro hardness decreased gradually with the increase of (Grwt%) to reach (19.4%) reduction at (8wt%Gr) in opposite the micro hardness mean value increased by (20%) as (Y2O3wt%) increased to (8wt%).Compression strength have was increased by (51%) as (Y2O3) content increased from (2-8)(wt%) for (Al 2024-3wt%Gr-XY2O3) composite, while it was decreased by (48%) with the addition of (8wt%) graphite to (Al 2024-3wt%Y2O3-XGr).The content of (Gr) had higher effect on wear rate than (Y2O3) where the wear rate decreased by (59.7%) and (41%) for composite samples respectively, within the limits of addition in the current study.

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