scholarly journals Effect of Alkaline Treatment on the Thermal Stability of Pineapple Leaf Fibers

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Mohit Mittal ◽  
Rajiv Chaudhary
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
High Temperature ◽  
Natural Fiber ◽  
Alkaline Treatment ◽  
Gravimetric Analysis ◽  
High Temperature Stability ◽  
Pineapple Leaf Fiber ◽  
Thermal Stability Of ◽  
Leaf Fiber

Recently, most of the industries are looking towards to incorporate sustainable, renewable, eco- friendly and affordable raw materials and production process. To achieve this goal, engineers and technologist are working on biocomposite material. The primary reason behind the selection of natural fiber based material in the automobile, construction, and aerospace industry is its low cost, lightweight, high specific strength and modulus, biodegradability, and friendly processing. Inspite of all beneficial features, one of the main barriers to their utilization in all mentioned sectors is thermal degradability. Natural fibers can be subjected to thermal degradation during composite processing and their application in the high-temperature field. So it is practically significant to understand the thermal decomposition of lignocellulosic fibers and to modify it for the purpose of high-temperature stability. In this work, alkaline treatment of varying concentrations (2%, 4%, 6%, 8%, and 10 wt %) was used to study the effect of alkaline treatment on thermal stability of pineapple leaf fibers. The thermal behavior of untreated and alkali treated pineapple leaf fiber was examined by using a thermal gravimetric analysis instrument (TGA). The results show that 4 wt% NaOH treated pineapple leaf fiber have maximum thermal stability. The decomposition of untreated and treated PALF was a two-stage process attributed to the thermal decomposition of hemicellulose, cellulose, and lignin. The results also showed that the temperature of initial degradation 251 0C increased to 285 0C after 4% alkaline treatment due to partial removal of hemicellulose and lignin.

Effect of Alkali and Silane Treatment on the Thermal Stability of Hemp Fibers as Reinforcement in Composite Structures

2011 ◽  
Vol 415-417 ◽  
pp. 666-670 ◽  
Author(s):  
Na Lu ◽  
Shubhashini Oza ◽  
Ian Ferguson
Keyword(s):  
Thermal Stability ◽  
Composite Structures ◽  
Natural Fiber ◽  
Alkali Treatment ◽  
Thermo Gravimetric Analysis ◽  
Natural Fibers ◽  
Gravimetric Analysis ◽  
Silane Treatment ◽  
Hemp Fibers ◽  
Thermal Stability Of

Natural fiber reinforced composites are being used as reinforcement material in composite system due to their positive environmental benefits. Added to that, natural fibers offer advantages such as low density, low cost, good toughness, high specific strength, relatively non-abrasive and wide availability. However, the low thermal stability of natural fibers is one of the major challenges to increase their use as reinforcing component. In this study, a thorough investigation has been done to compare the effect of two chemical treatment methods on the thermal stability of hemp fibers. 5wt% sodium hydroxide and 5wt% triethoxyvinylsilane was used for the treatment of hemp fibers. Fourier transform infrared spectroscopy, scanning electron microscopy and thermo gravimetric analysis were used for characterization of untreated and treated fiber. The results indicated that 24 hours alkali treatment and 3 hours silane treatment time enhanced the thermal stability of the hemp fiber. However, alkali treatment shows better improvement compared to silane treatment.

High Temperature Stability of SiC/Ti Interface

2011 ◽  
Vol 685 ◽  
pp. 340-344 ◽  
Author(s):  
Tung Wai Leo Ngai ◽  
Chang Xu Hu ◽  
Wei Zheng ◽  
Heng Xie ◽  
Yuan Yuan Li
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Composite Materials ◽  
Temperature Stability ◽  
Diffusion Path ◽  
Interfacial Stability ◽  
Diffusion Couples ◽  
High Temperature Stability ◽  
High Temperature Structural Material ◽  
Thermal Stability Of

Ti, SiC and their composite materials have been widely used as high temperature structural material. The knowledge of interfacial stability between SiC and Ti is vital in high temperature applications. In this study, SiC/Ti diffusion couples were prepared to investigate the interfacial reactions between SiC and Ti at 1273 K. Phase forming sequence, microstructure and thermal stability of SiC/Ti interface were studied. It was indicated that after annealed at 1273 K for 10 days, 4 reaction layers were formed at the SiC/Ti interface. The diffusion path between SiC and Ti is SiC/Ti3SiC2/Ti5Si3/Ti5Si3+TiC/Ti3Si/Ti. As the annealing time prolong, the thicknesses of these reaction layers increased.

scholarly journals Thermal Stability of Pepper Leaf Extracts

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 855A-855
Author(s):  
Jeff Anderson*
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Tissue Concentration ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Leaf Extracts ◽  
Acute Heat Stress ◽  
Dependent Change ◽  
Time Dependent Change ◽  
Thermal Stability Of

Acute heat stress can denature and aggregate proteins. The objective of this study was to determine how changes in the chemical and physical environment affected high temperature-induced turbidity and precipitation in pepper (Capsicum annuum L.) leaf extracts. High temperature stability of leaf extracts decreased as the tissue concentration increased. Control extracts exhibited a time-dependent change in resistance to turbidity and precipitate development, but the presence of polyvinylpolypyrrolidone stabilized the extracts. Ethylenediamine-tetraacetic acid had a less marked effect on turbidity and precipitation. Solution thermal stability increased as buffer pH increased from pH 6.0 to 7.0 regardless of whether the pH was adjusted before or after tissue extraction. Mannitol strongly stabilized pepper leaf extracts, but a surfactant lowered the thermal stability.

Thermal stability of TiSi2 films on single crystal and polycrystalline silicon

1991 ◽  
Vol 6 (7) ◽  
pp. 1502-1511 ◽  
Author(s):  
Krishna Shenai
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Single Crystal ◽  
Polycrystalline Silicon ◽  
Temperature Stability ◽  
Process Variations ◽  
Titanium Silicide ◽  
High Temperature Stability ◽  
Crystal Silicon ◽  
Thermal Stability Of

The stability of selectively formed TiSi2 films on single crystal and polycrystalline silicon layers at elevated process temperatures is reported. Extensive electrical and analytical studies were performed to understand the high-temperature stability of TiSi2 films as a function of (i) substrate dopant concentration, (ii) titanium silicide thickness, (iii) silicide formation sequence, and (iv) silicide post-processing steps. It is shown that all four process variations have a profound influence on the thermal stability of TiSi2 films. It is observed that titanium silicide films formed on single crystal silicon are stable at higher processing temperatures compared to those formed on polysilicon substrates under similar conditions. The degradation of high-temperature stability of TiSi2 films on polycrystalline silicon can be related to increased number of defects and grain boundaries. It is shown that TiSi2 films can be successfully used in silicon integrated circuit applications where the post-silicide processing temperatures do not exceed 1000 °C.

Thermal Stability of Nanoscale Multilayered ZrAlN/ZrB2 Coatings

2005 ◽  
Vol 107 ◽  
pp. 137-140 ◽  
Author(s):  
D.J. Li ◽  
J.J. Zhang ◽  
Ming Xia Wang
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Partial Pressure ◽  
Layer Structure ◽  
Temperature Stability ◽  
Substrate Bias ◽  
High Temperature Stability ◽  
Dc Magnetron Sputtering ◽  
Hardness Values ◽  
Thermal Stability Of

Multilayered ZrAlN/ZrB2 coatings were synthesized using a multi-cathode dc magnetron sputtering technique. Effects of substrate bias and N2 gas partial pressure on structural, mechanical properties, as well as thermal stability were investigated. Low bias was beneficial to synthesis of nanolayers with weak internal stress. The nanolayers deposited at lower N2 partial pressure and substrate bias exhibited good high-temperature stability in the crystalline and layer structure, and hardness values were increased significantly after high-temperature annealing.

scholarly journals Effect of Alkaline Treatment on The Mechanical Properties of Pineapple Leaf Fiber Composite Material

2020 ◽  
Vol 2 (3) ◽  
pp. 43-50
Author(s):  
M Febriyan Baruna Putra ◽  
Delima Yanti Sari ◽  
Hendri Nurdin ◽  
Rodesri Mulyadi
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Energy Efficient ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Alkaline Treatment ◽  
Fiber Composite Material ◽  
Pineapple Leaf Fiber ◽  
Alternative Material ◽  
Leaf Fiber

Utilization of natural fiber waste, especially pineapple dau fiber, is a major concern and continues to be developed to utilize and optimize plantation waste as a material that is more environmentally friendly, energy efficient and inexpensive. The purpose of this study was to determine the effect of alkaline treatment on the mechanical properties of pineapple leaf fiber composite material as an appropriate alternative material. The method in this research is the experimental method, where the research was carried out by giving variations in the percentage of alkaline 10% and 20%. The results of the research on the composite material of pineapple leaf fiber using tensile testing showed that giving alkaline treatment with a percentage of 20% made the fiber stronger but brittle. In addition, the orientation direction and immersion time also affect the tensile strength of the fibers. Pemanfaatan limbah serat alam khususnya serat dau nanas menjadi bahan alternatif menjadi perhatian utama serta terus dikembangkan guna memanfaatkan dan mengoptimalkan limbah perkebunan sebagai bahan material yang lebih ramah lingkungan, hemat energi, dan murah. Tujuan penelitian ini untuk mengetahui pengaruh perlakuan alkali terhadap sifat mekanik material komposit serat daun nanas sebagai bahan alternatif tepat guna. Metode dalam penelitian ini yaitu metode eksperimen, dimana penelitian dilakukan dengan pemberian variasi persentase alkali 10% dan 20%. Hasil penelitian material komposit serat daun nanas dengan menggunakan pengujian tarik menunjukkan bahwa pemberian perlakuan alkali dengan persentase 20% membuat serat menjadi lebih kuat namun bersifat getas. Selain itu, arah orientasi dan waktu perendaman juga mempengaruhi kekuatan tarik serat.

Fourier-Transform Infrared Spectroscopy and Thermal Investigation of Hybrid Banana/Sisal Fiber Reinforced Polyester Matrix Composite

2021 ◽  
Vol 1165 ◽  
pp. 39-46
Author(s):  
Ekene Gabriel Okafor ◽  
Mohammed Tahir Abba ◽  
Osichinaka Chiedu Ubadike ◽  
Stephen Agbo ◽  
Habeeb Mohammad Mohammed
Keyword(s):  
High Temperature ◽  
Mass Loss ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Temperature Stability ◽  
Gravimetric Analysis ◽  
Fiber Reinforced ◽  
High Temperature Stability ◽  
Hybrid Fiber ◽  
Polyester Matrix

The key focus of this work was to examine the effect of hybrid fiber reinforcement on thethermal properties of particulate based natural fiber-reinforced hybrid composites. Banana and sisal fiberswere selected as natural fiber reinforcements for the polyester matrix based composites, which wereproduced by mechanical stir mix technique. Thermo-Gravimetric Analysis (TGA) and Fourier-TransformInfrared Spectroscopy (FTIS) were conducted in accordance with American Society for Testing andMaterials (ASTM) standards for the characterization of the hybrid composites. The FTIS result shows thedisappearance of 1735 cm-1 peak, a notable evidence of NaOH treatment. The thermal analysis showedthat the hybridization significantly affected the high temperature stability of the composite, with 70%Sisal/30%Banana found to have the lowest high temperature mass loss at a temperature of 300–520oC, thushighest high temperature stability. Derivative Thermogravimetry (DTG) results shows a minor mass lossrate at a temperature range of 50–150oC as well as a major mass loss rate due to pyrolysis of key fiberconstituents such as cellulose, hemicellulose and lignin between 260 and 350oC. Also it was observed thatas the percentage of banana in the hybrid fiber increases the speed of high temperature mass loss reduces.

EFFECT OF PINEAPPLE LEAF FIBER LOADING ON THE MECHANICAL PROPERTIES OF PINEAPPLE LEAF FIBER – POLYPROPYLENE COMPOSITE

2015 ◽  
Vol 77 (21) ◽  
Author(s):  
Ayu Natasya Kasim ◽  
Mohd Zulkefli Selamat ◽  
Nabila Aznan ◽  
Siti Norbaya Sahadan ◽  
Mohd Ahadlin Mohd Daud ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Alkaline Treatment ◽  
Fiber Loading ◽  
Pineapple Leaf Fiber ◽  
The Many ◽  
Composition Ratios ◽  
Leaf Fiber

Natural fibers have become an important issue in the development of fiber reinforced polymer (FRP) composite to resolve the current ecological and environmental problems. Among the many types of natural fibers that are available, pineapple leaf fiber (PLF) was selected as the natural fiber used in this study due to comparatively better mechanical properties, ease of availability and low cost. In this work, the effects of pineapple leaf fiber (PLF) loading on the properties of PLF/polypropylene (PP) composites was studied. The sample of composites was fabricated with five different fiber loading of PLF (30, 40, 50, 60 and 70 wt.%). An alkaline treatment was conducted to enhance the PLF properties. The fabrication was made by compression molding technique with random orientation of PLF. From the experimental study, the results revealed that the voids percentage and interfacial bonding between the PLF and PP affected the mechanical properties of the PLF/PP composite. Based on the results of tensile stress, hardness and density, it can be concluded that the PLF/PP composite with the composition ratio of 30/70 wt.% has shown the best mechanical properties compared to other composition ratios (40/60, 50/50, 60/40 and 70/30 wt.%), which are 16.71 MPa, 62.83 Shore-D and 0.93 g/cm³ respectively.

Polycarbonate with Pineapple Leaf Fiber to Produce Functional Composites

2008 ◽  
Vol 47-50 ◽  
pp. 674-677 ◽  
Author(s):  
Poonsub Threepopnatkul ◽  
N. Kaerkitcha ◽  
N. Athipongarporn
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Pineapple Leaf Fiber ◽  
Functional Composites ◽  
Thermal Stability Of ◽  
Scanning Electron ◽  
Trimethoxy Silane ◽  
Leaf Fiber

This research is to study the properties of pineapple leaf fiber reinforced polycarbonate composites (PC/PALF). Surface of pineapple leaf fiber (PALF) was pre-treated with sodium hydroxide (PALF/NaOH) and modified with two different functionalities such as γ-aminopropyl trimethoxy silane (PALF/Z-6011) and γ-methacryloxy propyl trimethoxy silane (PALF/Z-6030). The effects of PALF content and chemical treatment were investigated by Fourier transform infrared spectroscopy, Scanning electron microscopy and mechanical testing. The modified pineapple leaf fibers composite also produces enhanced mechanical properties. Young’s modulus is highest in the case of the PALF/NaOH composites. The PALF/Z-6011 composites showed highest tensile strength and impact strength. In thermal property, the results from Thermogravimetric analysis showed that thermal stability of the composites is lower than that of neat polycarbonate resin and thermal stability decreased with increasing pineapple leaf fiber content.

Physical and abrasive wear behaviour of Urena lobata fiber-reinforced polymer composites

2020 ◽  
pp. 073168442096021
Author(s):  
Chioma E Njoku ◽  
Joseph A Omotoyinbo ◽  
Kenneth K Alaneme ◽  
Michael O Daramola
Keyword(s):  
Thermal Stability ◽  
Natural Fiber ◽  
Alkaline Treatment ◽  
Fiber Composites ◽  
Wear Behaviour ◽  
Fiber Reinforced ◽  
Polypropylene Composites ◽  
Fiber Loading ◽  
Physical Density ◽  
Thermal Stability Of

The influence of fiber loading and chemical treatment of Urena lobata natural fiber loading (5, 10, 15, 20, 25, 30, and 35 wt%) on the physical, wear, and thermal stability of polypropylene-based composites was investigated. Urena lobata fibers were treated with 6 wt% NaOH solution. Both the untreated and treated Urena lobata/polypropylene composites were produced by compression molding. The physical (density and water absorption) and abrasion properties of the composites were then evaluated. Thereafter, the thermal stability of the fibers and composites were analyzed. The alkaline-treated Urena lobata fiber-reinforced polypropylene composites showed improvement in the density (1.04–1.74 g/cm3) and wear resistance (19.57–26.17 mm3) than the untreated Urena lobata fiber/polypropylene composites. However, the treated Urena lobata fiber/polypropylene composites absorbed more water than the untreated Urena lobata fiber/polypropylene composites. Then the treated fiber composites were more thermally stable than the untreated fiber composites due to enhanced fiber–matrix adhesion obtained by alkaline treatment of the fibers.

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