scholarly journals Effect of gamma irradiation and oxidized bitumen on the performance of the modified crumb rubber for various applications

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
E.S. Fathy ◽  
Khaled F. El-Nemr ◽  
H.A. Youssef ◽  
M. El-Shafie
Keyword(s):  
Thermal Stability ◽  
Gamma Irradiation ◽  
Chemical Resistance ◽  
Crosslinking Density ◽  
Crumb Rubber ◽  
Mechanical Parameters ◽  
Waste Tires ◽  
Vibration Tests ◽  
Velocity Level ◽  
Thermal Stability Of

AbstractThe objective of this study is to enhance the properties of crumb rubber (CR) derived from the tread and sidewalls of passenger and truck waste tires by adding bitumen (B) and oxidized bitumen (OB). On this context, CR was activated and modified by adding different chemical ingredients to convert it into modified crumb rubber (MCR). OB was irradiated at 25 kGy to get irradiated oxidized bitumen (IOB) with the aim of study the effect of irradiation on the samples in the presence and absence of sulfur element. The crosslinking density, mechanical parameters and thermal stability of the developed blend were examined. Furthermore, chemical resistance behavior, vibration tests which reflecting the velocity level and sound proofing performance were discussed. Remarked improvement in the mechanical, thermal and various applications of MCR were achieved by the incorporation of OB especially at 10 phr and gamma irradiation.

scholarly journals Upcycling of Waste Polyethylene and Cement Kiln Dust to Produce Polymeric Composite Sheets Using Gamma Irradiation

2021 ◽  
Author(s):  
Ehab Khozemy ◽  
Hamdi Radi ◽  
Nabila A Mazied
Keyword(s):  
Thermal Stability ◽  
Gamma Irradiation ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Mechanical And Thermal Properties ◽  
Rubber Industry ◽  
Waste Polyethylene ◽  
Prepared Composite ◽  
Kiln Dust ◽  
Thermal Stability Of

Abstract Cement kiln dust (CKD) is a residue produced during the manufacture of cement that contains hazardous solid waste of high toxicity that affects the environment and public health. In this study, the possibility of using cement waste as a filler in the plastic and rubber industry was studied. Different concentrations of (CKD) and gamma irradiation on the mechanical, thermal stability of the prepared composites sheets were investigated. Different concentrations of (CKD) 10, 15, 20, 30, 35, and 40 wt % were prepared with double screw extrusion by mixing waste polyethylene (WPE), de-vulcanized rubber (DWR), and EPDM rubber. These prepared composites were irradiated with doses 25, 50, 75, 100, and 150 kGy to study the effect of radiation on the physical, mechanical properties, and thermal stability of the prepared composite sheets. The prepared composite sheets were characterized and verified by FTIR and soluble fractions. The morphology of the composite sheets was investigated by SEM. Mechanical and thermal properties were investigated to evaluate the possibility of its application in the plastic and rubber industry.

Glass Fiber Reinforced Composites of Coloured Epoxy Resin Cured with Different Amines

2002 ◽  
Vol 10 (6) ◽  
pp. 441-446
Author(s):  
Milan R. Patel ◽  
Manish P. Patel ◽  
Rashmika H. Patel ◽  
Ranjan G. Patel
Keyword(s):  
Thermal Stability ◽  
Epoxy Resin ◽  
Chemical Resistance ◽  
The Novel ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Glass Fiber Reinforced ◽  
Fibre Composites ◽  
Thermal Stability Of

A novel coloured epoxy resin has been synthesized by reaction between epichlorohydrin and bisazodiol. The curing of the resin, blended with a DGEBA resin, were characterized by differential scanning calorimetry (DSC). The thermal stability of the cured products has been investigated by thermogravimetric analysis (TGA). The cured products showed good thermal stability. Glass fibre composites were fabricated by blending a DGEBA resin and the novel coloured epoxy resin and their mechanical properties, electrical properties and chemical resistance were studied.

scholarly journals UV Polymerization of Methacrylates—Preparation and Properties of Novel Copolymers

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1659
Author(s):  
Marta Worzakowska
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Methyl Methacrylate ◽  
Chemical Resistance ◽  
Polymeric Materials ◽  
Monomer Content ◽  
Methacrylate Monomer ◽  
Methacrylate Monomers ◽  
Thermal Stability Of ◽  
Citronellyl Methacrylate

More environmentally friendly polymeric materials for use in corrosive conditions were obtained in the process of UV polymerization of terpene methacrylate monomers: geranyl methacrylate and citronellyl methacrylate and the commercially available monomer methyl methacrylate. Selected properties (solvent resistance, chemical resistance, glass transition temperature, thermal stability, and decomposition course during heating) were evaluated. It was found that the properties of the materials directly depended on the monomer percentage and the conditioning temperatures used. An increase in the geranyl or citronellyl methacrylate monomer content in the copolymers reduced the solubility and chemical resistance of the materials post-cured at 50 °C. The samples post-cured at 120 °C were characterized by high resistance to polar and non-polar solvents and the chemical environment, regardless of the percentage composition. The glass transition temperatures for samples conditioned at 120 °C increased with increasing content of methyl methacrylate in the copolymers. The thermal stability of copolymers depended on the conditioning temperatures used. It was greater than 200 °C for most copolymers post-cured at 120 °C. The process of pyrolysis of copolymers led to the emission of geranyl methacrylate, citronellyl methacrylate, and methyl methacrylate monomers as the main pyrolysis volatiles.

scholarly journals Effects of (complementary) Polyelectrolytes Characteristics on Composite Calcium Carbonate Microparticles Properties

2017 ◽  
Vol 54 (4) ◽  
pp. 708-714
Author(s):  
Cristian Barbu Mic ◽  
Marcela Mihai ◽  
Cristian Dragos Varganici ◽  
Simona Schwarz ◽  
Dan Scutaru ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Calcium Carbonate ◽  
Polymer Network ◽  
Weight Ratio ◽  
Crosslinking Density ◽  
Molar Ratio ◽  
Polyelectrolyte Complexes ◽  
Supersaturated Solutions ◽  
Thermal Stability Of ◽  
Flow Particle

This study follows the possibility to tune the thermal stability of some CaCO3/polymer composites by crystal growth from supersaturated solutions controlled by polymer structure or by using nonstoichiometric polyelectrolyte complexes (NPECs). As the ratio between the organic and inorganic parts in the composites controls the Ca2+/polymer network crosslinking density, the CaCO3/polymer weight ratio was kept constant at 50/1, varying the initial concentration of the polyanions solutions (0.05 or 0.06 wt.%), the NPECs molar ratio , n+/n- (0.2 or 0.4), or the inorganic precursors concentration (0.25 or 0.3 M). Poly(2-acrylamido-2-methylpropanesulfonic acid-co-acrylic acid) (PSA) and chondroitin-4-sulfate (CSA) were used as polyanions. Some NPEC dispersions, prepared with the same polyanions and poly(allylamine hydrochloride) (PAH), were also used for calcium carbonate crystallization. The characteristics of the prepared composites were investigated by scanning electron microscopy (SEM), flow particle image analysis (FPIA), particles charge density (CD), zeta-potential (ZP). The thermal stability of the composite particles was investigated as compared to bare CaCO3 microparticles prepared at the same initial inorganic concentrations.

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