scholarly journals Water Absorption Kinetics in Natural Rubber Composites Reinforced with Natural Fibers Processed by Electron Beam Irradiation

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2437
Author(s):  
Elena Manaila ◽  
Gabriela Craciun ◽  
Daniel Ighigeanu
Keyword(s):  
Diffusion Coefficient ◽  
Electron Beam ◽  
Natural Rubber ◽  
Water Absorption ◽  
Electron Beam Irradiation ◽  
Natural Fibers ◽  
Rubber Composites ◽  
Diffusion Parameters ◽  
Natural Rubber Composites ◽  
Kinetics Of

Natural rubber composites reinforced with hemp, flax, and wood sawdust were obtained by irradiation at room temperature with an electron beam of 5.5 MeV in order to meet the actual need for new materials that are environmentally friendly and safe for human health. The natural fibers loading was between 5 and 20 phr and the processing doses were between 75 and 600 kGy. The kinetics of water absorption in these materials were studied. The water diffusion was analyzed through Fick’s law. The water absorption parameters (Qt and Qeq), diffusion parameters (k and n), diffusion coefficient (D), intrinsic diffusion coefficient (D*), sorption coefficient (S), and permeation coefficient (P) have depended on the fiber nature, amount used in blends, and irradiation dose. The obtained results showed that not in the case of each type of fiber used, the water absorption could be correlated with the specific cellulose and hemicellulose content, due to the changes induced by the electron beam.

Effect of Vulcanization Processes on Properties of Natural Rubber/Cellulose Composites

2021 ◽  
Vol 902 ◽  
pp. 95-100
Author(s):  
Yanika Poonpipat ◽  
Tanabadee Boonmalert ◽  
Paweena Prapainainar ◽  
Peerapan Dittanet
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Electron Beam Irradiation ◽  
Morphological Analysis ◽  
Morphological Properties ◽  
Rubber Composites ◽  
Degradation Temperature ◽  
Cellulose Composites ◽  
Natural Rubber Composites ◽  
Reinforcing Filler

The effect of vulcanization processes and surface treatment of cellulose were investigated on tensile strength, degradation temperature, and morphological properties of cellulose/natural rubber composites. Cellulose was surface-treated with Si-69 silane coupling agent and used as reinforcing filler in natural rubber (NR). Different vulcanization processes including electron beam irradiation (EB-Cured) and sulphur vulcanization (S-Cured) were used to crosslink NR. The incorporation of both untreated and treated cellulose at various concentrations (5, 10, 15 and 20 phr) into NR was found to significantly improve the tensile strength and modulus. Notably, with addition of treated cellulose in NR, the tensile strength and modulus were considerably higher than that of the untreated cellulose for all curing system. SEM morphological analysis revealed a well dispersion of cellulose particles in NR matrix. Addition of cellulose slightly decreased the onset of degradation temperature of NR, however, the degradable temperature was found to be unchanged. The curing systems had shown an impact on tensile property of NR. S-Cured NR exhibited highest modulus of 2.23 MPa comparing to the EB-Cured NR (1.69 MPa) for the same amount of cellulose (20 phr), due to a stronger crosslink network. However, the curing system had no significant impact on degradation temperature of NR.

scholarly journals Mechanical Properties of Phormium Tenax Reinforced Natural Rubber Composites

Fibers ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 11
Author(s):  
Sivasubramanian Palanisamy ◽  
Kalimuthu Mayandi ◽  
Murugesan Palaniappan ◽  
Azeez Alavudeen ◽  
Nagarajan Rajini ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Tensile Elongation ◽  
Natural Fibers ◽  
Rubber Composites ◽  
Elongation At Break ◽  
Roll Mill ◽  
Natural Rubber Composites ◽  
Mechanical Tensile ◽  
American Society ◽  
Tear Properties

The introduction of natural fibers as a filler in a natural rubber (NR) matrix can be of relevance for their eco-friendly and sustainable nature as the substitute for carbon-based fillers. In this work, short Phormium tenax fibers were introduced in random orientation into a NR matrix in different lengths (6, 10, and 14 mm) and various amounts (10, 20, and 30%, taking 100 as the NR weight). The composite was fabricated using a two-roll mill according to American Society for Testing and Materials (ASTM) D3184-11 standard. Several properties were determined, namely tensile and tear characteristics, hardness, and abrasion resistance. The results suggest that the shortest fiber length used, 6 mm, offered the best combination between loss of mechanical (tensile and tear) properties and hardness and the most acceptable resistance to abrasion, with the properties increasing with the amount of fibers present in NR. As a consequence, it is indicated that a higher amount of fibers could be possibly introduced, especially to achieve harder composites, though this would require a more controlled mixing process not excessively reducing tensile elongation at break.

scholarly journals Water Absorption Kinetics in Composites Degraded by the Radiation Technique

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4659
Author(s):  
Elena Manaila ◽  
Gabriela Craciun ◽  
Daniel Ighigeanu ◽  
Maria Daniela Stelescu
Keyword(s):  
Electron Beam ◽  
Water Absorption ◽  
Electron Beam Irradiation ◽  
Dose Range ◽  
Beam Irradiation ◽  
Equilibrium Sorption ◽  
Diffusion Parameters ◽  
Radiation Technique ◽  
Plasticized Starch ◽  
Degradation Degree

Rubber-based wastes represent challenges facing the global community. Human health protection and preservation of environmental quality are strong reasons to find more efficient methods to induce degradation of latex/rubber products in order to replace devulcanization, incineration, or simply storage, and electron beam irradiation is a promising method that can be can be taken into account. Polymeric composites based on natural rubber and plasticized starch in amounts of 10 to 50 phr, obtained by benzoyl peroxide cross-linking, were subjected to 5.5 MeV electron beam irradiation in order to induce degradation, in the dose range of 150 to 450 kGy. A qualitative study was conducted on the kinetics of water absorption in these composites in order to appreciate their degradation degree. The percentages of equilibrium sorption and mass loss after equilibrium sorption were found to be dependent on irradiation dose and amount of plasticized starch. The mechanism of water transport in composites was studied not only through the specific absorption and diffusion parameters but also by the evaluation of the diffusion, intrinsic diffusion, permeation, and absorption coefficients.

CNT@NiO/natural rubber with excellent impedance matching and low interfacial thermal resistance toward flexible and heat-conducting microwave absorption applications

2021 ◽  
Author(s):  
Maofan Zhou ◽  
Gengping Wan ◽  
Pengpeng Mou ◽  
Shengjie Teng ◽  
Shiwei Lin ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Thermal Resistance ◽  
Microwave Absorption ◽  
Impedance Matching ◽  
Interfacial Thermal Resistance ◽  
Heat Conducting ◽  
Rubber Composites ◽  
Natural Rubber Composites

Herein, CNT@NiO/natural rubber composites were fabricated to apply as flexible and heat-conducting microwave absorption materials.

scholarly journals Kinetic modelling of NO heterogeneous radiation-catalytic oxidation on the TiO2 surface in humid air under the electron beam irradiation

Nukleonika ◽  
2017 ◽  
Vol 62 (3) ◽  
pp. 235-240 ◽  
Author(s):  
Henrietta Nichipor ◽  
Yongxia Sun ◽  
Andrzej G. Chmielewski
Keyword(s):  
Electron Beam ◽  
Catalytic Oxidation ◽  
Removal Efficiency ◽  
Electron Beam Irradiation ◽  
Kinetic Modelling ◽  
Water Concentration ◽  
Beam Irradiation ◽  
Humid Air ◽  
Kinetics Of ◽  
Influential Parameters

Abstract Theoretical study of NOx removal from humid air by a hybrid system (catalyst combined with electron beam) was carried out. The purpose of this work is to study the possibility to decrease energy consumption for NOx removal. The kinetics of radiation catalytic oxidation of NO on the catalyst TiO2 surface under electron beam irradiation was elaborated. Program Scilab 5.3.0 was used for numerical simulations. Influential parameters such as inlet NO concentration, dose, gas fl ow rate, water concentration and catalyst contents that can affect NOx removal efficiency were studied. The results of calculation show that the removal efficiency of NOx might be increased by 8-16% with the presence of a catalyst in the gas irradiated field.

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