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Journal articles on the topic 'Thermal aging; Ammonium stearate'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Ignatious, Francis, and Claude Mathis. "Thermal aging of tetraalkyl ammonium doped polyacetylenes." Macromolecules 23, no. 1 (1990): 70–77. http://dx.doi.org/10.1021/ma00203a014.

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2

Zhang, Xin Li, Hong Hui Zhang, Yi Qiang Wu, and Yun Chu Hu. "Preparation and Characterization of Silicate Wood Adhesive Modified with Ammonium Stearate." Advanced Materials Research 1033-1034 (October 2014): 1048–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.1048.

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In order to improve the water resistance of silicate wood adhesive, a kind of silicate adhesive was prepared from water glass with silica as curing agent, and ammonium stearate as modifier. The chemical structure, surface morphology and thermal properties of the silicate adhesive were characterized by Fourier transform infrared spectrometer, scanning electron microscope, and thermo-gravimetric analyzer. As the two main measures of adhesion properties, the bonding strength and water resistance were also determined. The results showed that ammonium stearate was successfully introduced into the m

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3

Bak, Mun-Gyu, Jong-Sung Won, Seon-Woong Koo, et al. "Migration Behavior of Lubricants in Polypropylene Composites under Accelerated Thermal Aging." Polymers 13, no. 11 (2021): 1723. http://dx.doi.org/10.3390/polym13111723.

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The surface migration of lubricants degrades the quality of thermoplastic polymer composites. In this study, the surface migration of lubricants in polypropylene composites were studied to improve the quality of the composites. Polypropylene (PP)/lubricant composites were manufactured using a co-rotating twin-screw extruder and injection molding, and the migration phenomena of the lubricant in the PP/lubricant composites were investigated under accelerated aging conditions with temperatures in the range of 20 to 90 °C and humidity of 100% for 72 h. The interrelation between the surface migrati

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4

Han, Wenyuan, Manqi Zhang, Degang Li, et al. "Design and Synthesis of a New Mannitol Stearate Ester-Based Aluminum Alkoxide as a Novel Tri-Functional Additive for Poly(Vinyl Chloride) and Its Synergistic Effect with Zinc Stearate." Polymers 11, no. 6 (2019): 1031. http://dx.doi.org/10.3390/polym11061031.

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Thermal stabilizers, lubricant, and plasticizers are three crucial additives for processing poly(vinyl chloride) (PVC). In this study, a new mannitol stearate ester-based aluminum alkoxide (MSE-Al) was designed and synthesized as a novel additive for PVC. The thermal stability and processing performance of PVC stabilized by MSE-Al were evaluated by the Congo red test, conductivity measurement, thermal aging test, ultravioletevisible (UV–Vis) spectroscopy test, and torque rheometer test. Results showed that the addition of MSE-Al could not only markedly improve the long-term thermal stability o

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5

Matsunaga, Hiroki, Hiroto Habu, and Atsumi Miyake. "Influences of aging on thermal decomposition mechanism of high performance oxidizer ammonium dinitramide." Journal of Thermal Analysis and Calorimetry 113, no. 3 (2013): 1387–94. http://dx.doi.org/10.1007/s10973-013-3186-0.

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6

Hayoune, Fouzia, Salim Chelouche, Djalal Trache, Safidine Zitouni, and Yves Grohens. "Thermal decomposition kinetics and lifetime prediction of a PP/PLA blend supplemented with iron stearate during artificial aging." Thermochimica Acta 690 (August 2020): 178700. http://dx.doi.org/10.1016/j.tca.2020.178700.

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7

Korchagin, Vladimir I., Alena M. Surkova, Lubov N. Studenikina, and Artem V. Protasov. "INFLUENCE OF PROOXIDANT NATURE ON EVOLUTION OF FORMALDEHYDE FROM OXO-DEGRADABLE POLYETHYLENE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 2 (2019): 101–7. http://dx.doi.org/10.6060/ivkkt.20196202.5804.

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In the article, methods of oxo-destruction of polyethylene modified with pro-oxidants of various nature are considered taking into account ecotoxicological aspects. A comparative evaluation of the indexes of degradation of polyethylene under the influence of air oxygen under accelerated thermal aging and under natural conditions is presented. It was revealed that the degradation index rises in the series "iron <copper <cobalt". The amount of formaldehyde in the gas-air extraction of oxo-degradable polyethylene modified with iron, cobalt and copper stearate is determined with accelerated

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8

Iga, Takeo, та Yoshio Murase. "Preparation of acicular particles of α-alumina". Journal of Materials Research 10, № 7 (1995): 1579–81. http://dx.doi.org/10.1557/jmr.1995.1579.

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Aluminum ammonium sulfate (AA) solution (0.1 mol/l) and ammonium hydrogen carbonate (AHC) solution (1.2 mol/l) were allowed to react at room temperature. The precipitates formed were kept with the mother liquor in a closed vessel and aged at 100 °C. Acicular-shaped crystalline particles of Al(NH4)CO3(OH)2, (AACH), were obtained after the elongated aging period. Acicular α-alumina particles were obtained through the thermal decomposition at 1300 °C out of the AACH particles which were previously treated with a small amount of tetraethoxysilane (about 1.6 wt. % of SiO2).

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9

Su, Junlin, Qi Chu, and Mao Ren. "Properties of high temperature resistance and salt tolerance drilling fluids incorporating acrylamide/2-acrylamido-2-methyl-1-propane sulfonic acid/N-vinylpyrrolidone/dimethyl diallyl ammonium chloride quadripolymer as fluid loss additives." Journal of Polymer Engineering 34, no. 2 (2014): 153–59. http://dx.doi.org/10.1515/polyeng-2013-0270.

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Abstract A quadripolymer of acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and dimethyl diallyl ammonium chloride (DMDAAC) was synthesized by solution free radical polymerization, and characterized using Fourier transform infrared (FTIR), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA) methods. The rheological and filtrate properties of saturated brine-based fluid with AM/AMPS/NVP/DMDAAC quadripolymer were investigated before and after thermal aging tests. The apparent viscosity (AV), plastic viscosity (PV) and yield poi

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10

Studenikina, L. N., T. E. Kudina, V. O. Iushin, and A. A. Melnikov. "Evaluation of the degradation of the modified polyolefins in different environments." Proceedings of the Voronezh State University of Engineering Technologies 82, no. 3 (2020): 227–32. http://dx.doi.org/10.20914/2310-1202-2020-3-227-232.

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Hybrid composites based on synthetic thermoplastics (STP) are a prospect for replacing traditional plastics in various sectors of the national economy: crop production (composite hydroponic substrates, containers, etc.), water treatment (composite biofilter loads), packaging industry, etc. The purpose of the work is to assess the destruction of composites based on STP, modified with prooxidants (PR) and polysaccharides (PS), in various external conditions that mimic environmental factors (thermal, photochemical (UV radiation), chemical, biochemical effects). As objects of research, we used pro

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11

Thongthai, P., H. Kitagawa, Y. Iwasaki, S. Noree, R. Kitagawa, and S. Imazato. "Immobilizing Bactericides on Dental Resins via Electron Beam Irradiation." Journal of Dental Research 100, no. 10 (2021): 1055–62. http://dx.doi.org/10.1177/00220345211026569.

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Polymerizable bactericides, such as quaternary ammonium compound–based monomers, have been intensively studied as candidates for immobilizing antibacterial components on dental resin. However, they predominantly exhibit a bacteriostatic behavior, rather than bactericidal, as the immobilized components are left with insufficient molecular movement to disrupt the bacterial surface structure through contact-mediated action. In this study, we developed a novel strategy to increase the density of the immobilized bactericide and enhance its antibacterial/antibiofilm properties by combining a surface

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12

Liu, Yu, Heliang Wang, Xiwei Guo, et al. "Xanthate-modified nanoTiO2 as a novel vulcanization accelerator enhancing mechanical and antibacterial properties of natural rubber." Nanotechnology Reviews 10, no. 1 (2021): 478–87. http://dx.doi.org/10.1515/ntrev-2021-0038.

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Abstract With the emerging of sustainability, the fabrication of effective and eco-friendly agents for rubber industry has attracted extensive attention. In this study, a novel and nontoxic titanium dioxide-based vulcanization accelerator (xanthate-modified nanotitanium dioxide (TDSX)) with excellent antibacterial performance, for the first time, was synthesized under the catalyst of ceric ammonium nitrate. Notably, the thermal stability of xanthate was greatly enhanced after being grafted on titanium dioxide (TiO2) nanoparticles, in which the activation energy was increased from 6.4 to 92.5 k

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13

Sowińska, Anna, Magdalena Maciejewska, and Anna Grajewska. "Bis(trifluoromethylsulfonyl)imide Ionic Liquids Applied for Fine-Tuning the Cure Characteristics and Performance of Natural Rubber Composites." International Journal of Molecular Sciences 22, no. 7 (2021): 3678. http://dx.doi.org/10.3390/ijms22073678.

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The goal of this work was to apply ionic liquids (ILs) with bis(trifluoromethylsulfonyl)imide anion (TFSI) for fine-tuning the cure characteristics and physico-chemical properties of elastomer composites based on a biodegradable natural rubber (NR) matrix. ILs with TFSI anion and different cations, such as alkylpyrrolidinium, alkylammonium, and alkylsulfonium cations, were applied to increase the efficiency of sulfur vulcanization and to improve the performance of NR composites. Thus, the influence of ILs on the vulcanization of NR compounds, as well as crosslink density and physical propertie

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14

Xu, Pengfei, Yuewen Lu, Ping Ye, Qian Wang, and Changping Guo. "In situ synthesis of copper stearate/ammonium perchlorate shell–core composite for self-catalytic thermal decomposition." Journal of Thermal Analysis and Calorimetry, June 29, 2020. http://dx.doi.org/10.1007/s10973-020-09877-4.

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15

Bello, Abdu Muhammad, та Abdul Rahim Yacob. "The interplay of polyoxyethylene (40) stearate surfactant concentration and aging time on the Mesoporous γ-alumina synthesis and appraisal of its catalytic activity". SN Applied Sciences 3, № 1 (2021). http://dx.doi.org/10.1007/s42452-020-04094-y.

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AbstractAn economical and environmentally benign synthesis method remains important in industrial processes. In this work, kaolin an abundant and non-toxic precursor is employed for mesoporous gamma-alumina synthesis. The study explored the consequence of varying polyoxyethylene (40) stearate (PS) surfactant concentration and aging time in the synthesis of mesoporous gamma-alumina with enhancing structural properties. The alumina was characterized using X-Ray Powder Diffraction (XRD), Thermogravimetric-Derivative Thermal Gravimetric (TG-DTG), Fourier Transform Infrared (FTIR), N2 Adsorption–De

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16

Bello, Abdu Muhammad, та Abdul Rahim Yacob. "The interplay of polyoxyethylene (40) stearate surfactant concentration and aging time on the Mesoporous γ-alumina synthesis and appraisal of its catalytic activity". SN Applied Sciences 3, № 1 (2021). http://dx.doi.org/10.1007/s42452-020-04094-y.

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AbstractAn economical and environmentally benign synthesis method remains important in industrial processes. In this work, kaolin an abundant and non-toxic precursor is employed for mesoporous gamma-alumina synthesis. The study explored the consequence of varying polyoxyethylene (40) stearate (PS) surfactant concentration and aging time in the synthesis of mesoporous gamma-alumina with enhancing structural properties. The alumina was characterized using X-Ray Powder Diffraction (XRD), Thermogravimetric-Derivative Thermal Gravimetric (TG-DTG), Fourier Transform Infrared (FTIR), N2 Adsorption–De

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17

Deptula, A., W. Lada, T. Olczak, T. zoltowski, and A. Di Bartolomeo. "Preparation of Superconducting YBa2Cu3O7−x Compounds By Water Extraction Variant Of Sol-Gel Process." MRS Proceedings 180 (1990). http://dx.doi.org/10.1557/proc-180-907.

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ABSTRACTThe starting sols were prepared by addition of ammonium hydroxide to acidic solutions of Y-Ba-Cu acetates or by dissolving solid Ba9CO9 or CuCO9.CuCOH)2H2O in acetates of the remaining components. The sols were then gelled to spherical particles with diameter below 50μm by extracting water with 2-ethyl-l-hexanol or to shard by evaporation of water. After thermal treatment of both powders amorphous and then crystalline YBa2Cu,9O7−x were obtained. Formation of these compounds is strongly improved by aging the gel at 200°C. Green and sintered pellets exhibit excellent superconductivity pr

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18

"Final Report on the Safety Assessment of Glycyrrhetinic Acid, Potassium Glycyrrhetinate, Disodium Succinoyl Glycyrrhetinate, Glyceryl Glycyrrhetinate, Glycyrrhetinyl Stearate, Stearyl Glycyrrhetinate, Glycyrrhizic Acid, Ammonium Glycyrrhizate, Dipotassium Glycyrrhizate, Disodium Glycyrrhizate, Trisodium Glycyrrhizate, Methyl Glycyrrhizate, and Potassium Glycyrrhizinate1." International Journal of Toxicology 26, no. 2_suppl (2007): 79–112. http://dx.doi.org/10.1080/10915810701351228.

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Glycyrrhetinic Acid and its salts and esters and Glycyrrhizic Acid and its salts and esters are cosmetic ingredients that function as flavoring agents or skin-conditioning agents—miscellaneous or both. These chemicals may be isolated from licorice plants. Glycyrrhetinc Acid is described as at least 98% pure, with 0.6% 24-OH-Glycyrrhetinic Acid, not more than 20 g/g of heavy metals and not more than 2 g/g of arsenic. Ammonium Glycyrrhizate has been found to be at least 98% pure and Dipotassium Glycyrrhizate has been found to be at least 95% pure. Glycyrrhetinic Acid is used in cosmetics at co

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