scholarly journals Characterization of Date Palm Fiber-Reinforced Different Polypropylene Matrices

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 597 ◽  
Author(s):  
Mohammed Sh. Al-Otaibi ◽  
Othman Y. Alothman ◽  
Maher M. Alrashed ◽  
Arfat Anis ◽  
Jesuarockiam Naveen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Date Palm ◽  
Alkali Treatment ◽  
Fiber Reinforced ◽  
Scanning Calorimetry ◽  
Palm Fiber ◽  
Pull Out ◽  
Hemicellulose Removal ◽  
The Matrix ◽  
Thermal Stability Of

In this study, the effect of different polypropylene (PP) matrices (homopolymer (HPP), impact copolymer (ICP), and recycled polypropylene (rPP)) on the mechanical, morphological, and thermal properties of date palm fiber (DPF)-reinforced PP composites was investigated. The DPFs were treated with an alkali solution, and composites were fabricated with different DPF loadings (5, 10, and 15 wt %) and lengths (less than 2 mm and 8–12 mm). It was found that the tensile properties of the DPF/ICP and DPF/rPP composites were similar to those of the DPF/HPP composites. The addition of fiber to the matrix reduced its tensile strength but increased the modulus. The alkali treatment improved the compatibility between the fibers and the matrix by removing hemicellulose and other impurities. Fourier transform infrared spectroscopy confirmed hemicellulose removal. The morphology of the alkali-treated fractured tensile specimen revealed improved adhesion and less fiber pull out. Differential scanning calorimetry revealed that the alkali treatment enhanced the crystallinity index. Thermogravimetric analysis showed that the addition of DPFs into the PP matrix reduced the thermal stability of the composite. However, the thermal stability of the treated fiber-reinforced rPP and ICP composites was similar to that of the DPF/HPP composite. Hence, rPP can be used as an alternative to HPP with DPFs.

Effect of alkali treatment on the thermal properties of wheat straw fiber reinforced epoxy composites

2016 ◽  
Vol 51 (3) ◽  
pp. 323-331 ◽  
Author(s):  
Varun Mittal ◽  
Shishir Sinha
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Wheat Straw ◽  
Fiber Composite ◽  
Alkali Treatment ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Ftir Studies ◽  
Four Levels ◽  
Thermal Stability Of

This paper focuses on the study of the effect of fiber content and alkali treatment on the thermal properties of wheat straw epoxy composite. Four levels of fiber loading (10, 20, 30, and 40 wt%) of wheat straw and three levels of alkali treatment (1, 3, and 5%) were considered and merged into epoxy composites. The composites were prepared by hand layup technique. The thermal stability of the components was studied by thermogravimetric analysis and differential scanning calorimetry, as well as by the differential thermogravimetric. The experimental results show that the thermal stability of the composites prepared from 3% alkali-treated fibers is superior as compared to the untreated and another level of alkali-treated fiber composite. This is mainly due to the efficient fiber–matrix adhesion in the alkali-treated wheat straw epoxy composites. Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) studies were carried out to evaluate the microstructure and composition of wheat straw fiber/epoxy composites, respectively.

Effect of diameters and alkali treatment on the tensile properties of date palm fiber reinforced epoxy composites

2012 ◽  
Vol 13 (7) ◽  
pp. 1199-1206 ◽  
Author(s):  
Abdalla Abdal-hay ◽  
Ngakan Putu Gede Suardana ◽  
Do Yeon Jung ◽  
Kwang-Seog Choi ◽  
Jae Kyoo Lim
Keyword(s):  
Tensile Properties ◽  
Date Palm ◽  
Alkali Treatment ◽  
Epoxy Composites ◽  
Fiber Reinforced ◽  
Palm Fiber

scholarly journals Effect of chemical treatment on thermal properties of hair fiber-based reinforcement of HF/HDPE composites

2018 ◽  
Vol 25 (4) ◽  
pp. 807-815
Author(s):  
Prashant Srivastava ◽  
Shishir Sinha
Keyword(s):  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Tensile Test ◽  
Alkali Treatment ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Thermal Analyzer ◽  
Hair Fiber ◽  
Chemical Groups ◽  
Thermal Stability Of

Abstract The present study deals with the effects of fiber loading and alkali treatment (AT) on thermal behavior of a hair fiber (HF)-reinforced high-density polyethylene (HDPE) composite. The HF/HDPE-reinforced polymer composite has been prepared through a compression molding technique, which provided optimum thermal stability at 15 wt% of the fiber in the reinforced composite. The thermal stability of the composite has been investigated using a thermal analyzer [thermogravimetric analysis (TGA), derivative thermogravimetric analysis (DTG) and differential scanning calorimetry (DSC)]. The ATs of HF-reinforced composites have affected the thermal stability of the material, in which the observed optimum thermal stability is 0.25 N AT 15% HF/HDPE-reinforced composites. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and tensile test played an important role in the study of the thermal stability of the material. FTIR analysis was used to investigate the chemical groups between the fiber and matrix. The morphology of the fiber is beneficial for the study of the surface treatment effect on the HF. The tensile test examined the optimum strength at 0.25 N AT 15% HF/HDPE composite, and a good relationship between the thermal and mechanical properties was also observed.

scholarly journals Influence of Alkali Treatment and Dune Sand Content on the Properties of Date Palm Fiber Reinforced Unsaturated Polyester Hybrid Composites

2020 ◽  
Vol 30 (3-4) ◽  
pp. 161-167
Author(s):  
Yazid Meftah ◽  
Masoud Tayefi ◽  
Fatma Fellouh ◽  
Houria Chouieur ◽  
Samira Maou ◽  
...  
Keyword(s):  
Date Palm ◽  
Hybrid Composites ◽  
Alkali Treatment ◽  
Unsaturated Polyester ◽  
Sand Content ◽  
Fiber Reinforced ◽  
Dune Sand ◽  
Palm Fiber

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

scholarly journals Isothermal Vulcanization and Non-Isothermal Degradation Kinetics of XNBR/Epoxy/XNBR-g-Halloysite Nanotubes (HNT) Nanocomposites

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2872
Author(s):  
Seyed Mohamad Reza Paran ◽  
Ghasem Naderi ◽  
Elnaz Movahedifar ◽  
Maryam Jouyandeh ◽  
Krzysztof Formela ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Degradation Kinetics ◽  
Halloysite Nanotubes ◽  
Butadiene Rubber ◽  
Order Model ◽  
Scanning Calorimetry ◽  
Theoretical Methods ◽  
Vulcanization Kinetics ◽  
Kinetics Of ◽  
Thermal Stability Of

The effect of several concentrations of carboxylated nitrile butadiene rubber (XNBR) functionalized halloysite nanotubes (XHNTs) on the vulcanization and degradation kinetics of XNBR/epoxy compounds were evaluated using experimental and theoretical methods. The isothermal vulcanization kinetics were studied at various temperatures by rheometry and differential scanning calorimetry (DSC). The results obtained indicated that the nth order model could not accurately predict the curing performance. However, the autocatalytic approach can be used to estimate the vulcanization reaction mechanism of XNBR/epoxy/XHNTs nanocomposites. The kinetic parameters related to the degradation of XNBR/epoxy/XHNTs nanocomposites were also assessed using thermogravimetric analysis (TGA). TGA measurements suggested that the grafted nanotubes strongly enhanced the thermal stability of the nanocomposite.

Grain Growth in Nanocrystalline Nickel

1999 ◽  
Vol 580 ◽  
Author(s):  
G.D. Hibbard ◽  
U. Erb ◽  
K.T. Aust ◽  
G. Palumbo
Keyword(s):  
Thermal Stability ◽  
Grain Size ◽  
Grain Growth ◽  
Size Distributions ◽  
Nanocrystalline Nickel ◽  
Scanning Calorimetry ◽  
Solute Content ◽  
Grain Size Distributions ◽  
Thermal Stability Of ◽  
Total Solute Content

AbstractIn this study, the effect of grain size distribution on the thermal stability of electrodeposited nanocrystalline nickel was investigated by pre-annealing material such that a limited amount of abnormal grain growth was introduced. This work was done in an effort to understand the previously reported, unexpected effect, of increasing thermal stability with decreasing grain size seen in some nanocrystalline systems. Pre-annealing produced a range of grain size distributions in materials with relatively unchanged crystallographic texture and total solute content. Subsequent thermal analysis of the pre-annealed samples by differential scanning calorimetry showed that the activation energy of further grain growth was unchanged from the as-deposited nanocrystalline nickel.

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