scholarly journals Mechanical Properties of Thermoplastics Corn Starch (TPCS) Reinforced Pineapple Leaf Fibre (PALF) Composite

2019 ◽  
Vol 8 (4) ◽  
pp. 8817-8821
Keyword(s):  
Corn Starch ◽  
Tensile Modulus ◽  
Impact Testing ◽  
Compression Moulding ◽  
Weight Percentage ◽  
Flexural Testing ◽  
The Impact ◽  
Fibre Loading ◽  
Selection Of

The aim of this study is to investigate the mechanical characterization of bio-composites on thermoplastic corn starch (TPCS) reinforced with 2 mm length of pineapple leaf fibre (PALF). The selection of different weight percentages of fibres (20, 30, 40, 50 and 60) weight percentage (wt.%) of PALF contents were applied in this study. The mixtures of TPCS with different wt.% of PALF were made by using a hot compression moulding at 165 °C for 15 minutes. The mechanical testing that has been performed are tensile, flexural and impact testing to determine the effect of fibre loading on bio-composites characteristics. The results show that by incorporating 40 wt.% loading of PALF, the tensile strength and tensile modulus has increased to the maximum. However, the flexural testing result shows that 50 wt.% loading of PALF show the highest strength and modulus. Meanwhile, the impact testing result shows decrement when the loadings of PALF increases. Scanning electron microscopy (SEM) show that the TPCS with 40 wt.% of PALF have a good miscibility between matrix/fibre in the bio-composites. Overall, the TPCS/PALF composites enhance the properties of the bio-composites for short-life application: that is, plate, container, disposable tray, packaging etc.

Characteristic of thermoplastics corn starch composite reinforced short pineapple leaf fibre by using laminates method

2020 ◽  
Vol 14 (3) ◽  
pp. 7058-7070
Author(s):  
Nazri Huzaimi Zakaria ◽  
Mohd Zamani Ngali ◽  
Mohd Zulkefli Selamat ◽  
Fudhail Abdul Munir ◽  
Mohd Asyraf Aman
Keyword(s):  
Inverse Relationship ◽  
Water Solubility ◽  
Moisture Absorption ◽  
Corn Starch ◽  
Degradable Polymers ◽  
Compression Moulding ◽  
Weight Percentage ◽  
Soil Burial ◽  
Selection Of

In recent years, the increased demand of biodegradable polymers has sparked the research interest in the development of alternatives to conventional polymers. As such, starch considerably one of the best substitutes to the non-degradable polymers owing to its advantages. The main purpose of this study is to investigate the mechanical, physical and environmental characterization of bio-composites, which is in this case the thermoplastic corn starch (TPCS) reinforced with a 2 mm length of pineapple leaf fibre (PALF). The selection of different weight percentages in the range of 20 to 60 weight percentage (wt.%) of PALF contents were applied in this work. The mixtures of TPCS with different wt.% of PALF were made by using a hot compression moulding at 165 °C for 15 minutes. Several testing has been performed to determine the bio-composites characteristics. The results show that by incorporating 40 wt.% loading of PALF, the tensile and modulus strength has increased to the maximum. It is also seen that there is an inverse relationship between the moisture content and the wt.% loading of PALF. However, the water and moisture absorption show a direct relationship with wt.% loading of PALF. Meanwhile, the soil burial decreases when the wt.% loadings of PALF increase while the results for water solubility suggest vice versa. It is also found that the TPCS with 40 wt.% of PALF have a good miscibility between matrix/fibre in the bio-composites.

An Investigation of Mechanical Properties of Recycled EVA/Commingled Plastics

2013 ◽  
Vol 467 ◽  
pp. 198-202 ◽  
Author(s):  
Kristsada Sanguanwong ◽  
Mostafa Nikzad ◽  
Igor Sbarski ◽  
S.H. Masood ◽  
Ajay Kapoor
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Ethylene Vinyl Acetate ◽  
Impact Testing ◽  
Thermoplastic Polymer ◽  
Compression Moulding ◽  
Elongation At Break ◽  
Moulding Process ◽  
Flexural Testing ◽  
The Impact

In the present study, the mechanical properties of recycled ethylene-vinyl acetate (EVA)/commingled thermoplastic polymer (CTP) composite material are investigated. The recycled CTP was blended with recycled EVA at different fractions by weight to form CTP/EVA composites.Test specimens of CTP/EVA composites were produced using compression moulding process to evaluate their mechanical properties. The results of tensile testing showed that the incorporation of EVA into CTP resulted in reduction of tensile strength but increase in elongation at break. In addition, the impact testing and flexural testing also showed that there is a general decrease in impact and flexural strength and also in flexural deformation, with increased percentage of EVA into the composite materials.

scholarly journals Characterization of Carrier Phase-Based Positioning in Real-World Jamming Conditions

2021 ◽  
Vol 13 (14) ◽  
pp. 2680
Author(s):  
Søren Skaarup Larsen ◽  
Anna B. O. Jensen ◽  
Daniel H. Olesen
Keyword(s):  
Real World ◽  
Carrier Phase ◽  
Reference Station ◽  
Baseline Length ◽  
Dual Frequency ◽  
Positioning Accuracy ◽  
The Impact ◽  
Single Versus ◽  
Selection Of

GNSS signals arriving at receivers at the surface of the Earth are weak and easily susceptible to interference and jamming. In this paper, the impact of jamming on the reference station in carrier phase-based relative baseline solutions is examined. Several scenarios are investigated in order to assess the robustness of carrier phase-based positioning towards jamming. Among others, these scenarios include a varying baseline length, the use of single- versus dual-frequency observations, and the inclusion of the Galileo and GLONASS constellations to a GPS only solution. The investigations are based on observations recorded at physical reference stations in the Danish TAPAS network during actual jamming incidents, in order to realistically evaluate the impact of real-world jamming on carrier phase-based positioning accuracy. The analyses performed show that, while there are benefits of using observations from several frequencies and constellations in positioning solutions, special care must be taken in solution processing. The selection of which GNSS constellations and observations to include, as well as when they are included, is essential, as blindly adding more jamming-affected observations may lead to worse positioning accuracy.

Performance evaluation of HDPE/MWCNT and HDPE/kenaf composites

2019 ◽  
pp. 089270571986827 ◽  
Author(s):  
Nayan Pundhir ◽  
Sunny Zafar ◽  
Himanshu Pathak
Keyword(s):  
Tensile Test ◽  
Strain Rate ◽  
Polymer Composite ◽  
Tensile Modulus ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Compression Moulding ◽  
Multi Walled Carbon Nanotube ◽  
Kenaf Composites ◽  
The Impact

The present work deals with the microwave-assisted compression moulding of high-density polyethylene (HDPE)-based composites. In the present work, 20 wt% of reinforcement in the form of kenaf and multi-walled carbon nanotube (MWCNT) was used to fabricate HDPE/kenaf and HDPE/MWCNT polymer composites. The mechanical characterizations of the microwave-processed composites were carried out in terms of uniaxial tensile test with different strain rate, multistep stress relaxation, flexural and impact test. The uniaxial tensile test revealed that the tensile modulus of microwave-processed four-layered HDPE/kenaf polymer composite was 35.2% higher than that of HDPE/MWCNT polymer composite. The HDPE/MWCNT polymer composite showed a minimum of 1.25 GPa and a maximum of 4.7 GPa of elastic modulus when tested at different strain rate. The impact energy absorbed by the HDPE/kenaf polymer composite (1.055 J) was 81.12% higher than the HDPE/MWCNT polymer composite (0.582 J).

Preparation and Characterization of Polymer Nanocomposite Containing PMMA, Styrene and Nanoalumina

2008 ◽  
Vol 8 (8) ◽  
pp. 4056-4067
Author(s):  
Dhananjay Singh ◽  
T. Jayasimha ◽  
K. N. Rai ◽  
Anil Kumar
Keyword(s):  
Polymer Matrix ◽  
Testing Machine ◽  
Impact Resistance ◽  
Polymer Nanocomposite ◽  
Impact Testing ◽  
Hydroxyl Groups ◽  
Alumina Surface ◽  
Weight Impact ◽  
The Impact

Polymer syrup of polymethyl methacrylate and polystyrene reinforced with 2% non settling nanoalumina particles was prepared by dual initiating system containing benzoylperoxide (BPO), azobisisobutyro nitrile (AIBN) and dimethylaniline (DMA). Nanoalumina particles were prepared using autoignition of aluminum nitrate and urea. Nanoalumina particles show the tendency of agglomeration in the polymer matrix because of the presence of hydroxyl groups on its surface. To get better dispersion in polymer matrix, the alumina surface was treated with methacrylol isocyanate, synthesized by the reaction of methacrylol chloride and sodium azide in the presence of dry benzene at 0 °C. The polymer syrup prepared this way was applied between two PMMA sheets of 10 cms × 10 cms × 2 mm dimensions each and the composite thus prepared was tested with Bullet Firing Machine as well as Vertical Drop Weight Impact Testing Machine. The impact strength measurements of two plates composite using both these procedures showed that the impact resistance was found to double in case of nanoalumina. The composite of ten layers and of eleven layers was further tested by 0.32 IOF revolver and Sub Machine Gun Carbine 9 mm 1A1 respectively from 10 m distance which produced an ordinary indent with no penetration.

scholarly journals Forecasting the Finest Firmness of Biocomposites using Response Surface Design Methodology

2020 ◽  
Vol 8 (6) ◽  
pp. 3958-3962
Keyword(s):  
Response Surface ◽  
Fiber Length ◽  
Alkali Treatment ◽  
Low Cost ◽  
Impact Testing ◽  
Compression Moulding ◽  
Banana Fiber ◽  
Banana Fibers ◽  
Process Factors ◽  
The Impact

Natural fibers are considered likely to be used in polymer composite materials as reinforcing agents because of their main advantages such as fine strength and rigidity, low cost, environmentally friendly, degradable and renewable material. A study was conducted to assess the impact of properties of bicomposite made from cardanol resin banana fibers. The banana fiber extracted from the banana stem was treated with alkali to enhance the interfacial linkage around fiber and cardanol resin. Biocomposite was manufactured using formaldehyde mixed with cardanol oil to form cardanol resin mixed with banana fiber using compression moulding Techniques with different process factors such as fiber weight (5%, 10%, 15%, 20%, and 25%) different fiber length (5, 10, 15, 20, and 25 in mm) and alkali treatment (varying in 1%, 3%, 5%, 7% and 9%. The developed banana fiber reinforced composite were then characterized by impact testing showing strong significance and association in DOE using 15.2% fiber weight response surface methodology with 15.3 mm fiber length and 4.7% alkaline treated. Thus we examined the effect of the above factors on impact and suggested the best combinations of factors for composite processing

scholarly journals Investigation of the Mechanical Properties of Hybrid Carbon-Hemp Laminated Composites Used as Thermal Insulation for Different Industrial Applications

2014 ◽  
Vol 6 ◽  
pp. 829426 ◽  
Author(s):  
M. L. Scutaru ◽  
M. Baba
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composite ◽  
Composite Laminate ◽  
Industrial Applications ◽  
Impact Testing ◽  
Impact Behavior ◽  
Low Velocity ◽  
Hemp Fabric ◽  
The Impact

Carbon-hemp composite laminate provides good thermal properties. For this reason this type of material is presently being used for various applications like insulator for airplanes, spaceships, nuclear reactors, and so forth. Unfortunately their mechanical properties are less studied. These characteristics are very important since they should be guaranteed also for important mechanical stress in addition to the thermal one. The present paper presents a study regarding the impact testing of some hybrid composite laminate panels based on polyester resin reinforced with both carbon and hemp fabric. The effects of different impact speeds on the mechanical behavior of these panels have been analyzed. The paper lays stress on the characterization of this hybrid composite laminate regarding the impact behavior of these panels by dropping a weight with low velocity.

Calibrator material selection: a key criteria during biomarker assay method development

Bioanalysis ◽  
2021 ◽  
Author(s):  
Sai P Thankamony ◽  
Rong Liu ◽  
Jon E Peterson ◽  
Rasa Santockyte ◽  
Timothy Olah ◽  
...  
Keyword(s):  
Decision Making ◽  
Case Studies ◽  
Method Development ◽  
Material Selection ◽  
Assay Method ◽  
Context Of Use ◽  
The Impact ◽  
Selection Of

Biomarker assay method development is a multistep rigorous process and calibrant material selection is integral to ensuring the quality of such assays. However, the impact of selection of calibrator material may often get overlooked. In this article, we highlight three case studies where biomarker calibrant material selection was deemed an essential criterion for consideration. Through these case studies we highlight challenges faced, steps taken and discuss the impact on assay-related decision-making. We also provide additional perspectives for selection and characterization of calibrant proteins in the setting of an evolving biomarker context of use.

scholarly journals The Mesoamerican mid-summer drought: the impact of its definition on occurrences and recent changes

2021 ◽  
Author(s):  
Edwin P. Maurer ◽  
Iris T. Stewart ◽  
Kenneth Joseph ◽  
Hugo G. Hidalgo
Keyword(s):  
Historical Record ◽  
Climate Projections ◽  
Summer Drought ◽  
Seasonal Forecasts ◽  
Drought Pattern ◽  
The Caribbean ◽  
The Impact ◽  
Minimum Intensity ◽  
Selection Of

Abstract. The mid-summer drought, veranillo or canícula, is a phenomenon experienced in many areas, including Mexico, Central America, and the Caribbean. It generally is experienced as reduced rainfall in July–August, in the middle of the typical rainy season (May–September). Many past studies have attempted to quantify changes in mid-summer drought characteristics during the recent past or for future climate projections. To do this, objective definitions of a mid-summer drought’s occurrence, strength and duration have been developed by many researchers. In this effort we adopt a recent set of definitions and examine the impact of varying these on the characterization of mid-summer droughts and the detected changes over the past four decades. We find the selection of a minimum intensity threshold has a dramatic effect on the results of both the area considered as experiencing a mid-summer drought and the changes detected in the recent historical record. The intensity chosen can affect both the magnitude and direction of changes reported in the recent observed record. Further, we find that the typical mid-summer drought pattern may not be occurring during the time it has historically; whether examining past or future changes or developing improved seasonal forecasts, the non-stationarity of its timing should be accommodated.

Development and mechanical characterization of microwave-cured thermoplastic based natural fibre reinforced composites

2018 ◽  
Vol 32 (10) ◽  
pp. 1427-1442 ◽  
Author(s):  
Manoj Kumar Singh ◽  
Sunny Zafar
Keyword(s):  
Mechanical Characterization ◽  
Mechanical Performance ◽  
Natural Fibre ◽  
Weight Percentage ◽  
Microwave Curing ◽  
Interlaminar Shear ◽  
Traditional Manufacturing ◽  
The Impact ◽  
Fibre Reinforced Composites

In the present work, polypropylene (PP)- and polyethylene (PE)-based composites were cured using microwave energy with 15% weight percentage of jute and kenaf fibres. The detailed mechanism of microwave curing of the composites has been discussed with suitable illustrations. The mechanical characterization of the microwave-cured composites was carried out using various tests. The scanning electron microscope (SEM) fractographs were used to study the mechanisms of failure. The ultimate tensile strength of various microwave-cured composites was in the range of 44–50 MPa. The interlaminar shear strength of the PP-based composites was 62% higher than the PE-based composites. The impact energy of the microwave-cured composites was in the range of 18–24 kJ. The mechanical performance of the microwave-cured composites was comparable to the composites obtained through traditional manufacturing routes.

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