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In order to study the anti-aging properties of polypropylene / mica composite materials, the above polypropylene / mica composite materials were placed outside to study the influence of natural aging time on the anti-aging properties and to explore the natural aging mechanism of polypropylene / mica composites.
Natural aging research results show that:with the extension of the natural aging time the surface of materials will appear cracks and sheddings.
Preparation of composite materials.
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Bernas, et al: Journal of Applied Polymer Science, Vol. 87 (2003), p.931–938

Several mineral materials (dolomite- and silica-based) were examined and results are presented in this paper.
Perspective direction in material science is the application of various modifying additives for increasing the durability of asphalt concrete.
On the surface of grains, bitumen is under influence of the molecules of the surface layer of mineral materials [12…15].
Vysotskaya, Nanostructured road-building materials based on organic binders, Construction Materials. 4 (2013) 20–23.
Korolev, System analysis in building materials, MGSU, Moscow, 2012.

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Mangeron, No. 51, 700050, Iasi, Romania 2Technical University “Gheorghe Asachi” of Iasi-Romania, Department of Material Science, Blvd.
Materials and Methods Base Material.
Shtansky, Advanced Technologies, materials and coatings developed in scientific-Educational Center of SHS, Galvanotechnik, 2009, pp. 1-13
[7] Jian-sheng Wang, Hui-min Meng, Hong-ying Yu, Zi-shuan Fan, Dong-bai, Characterization and wear behavior of WC-0.8Co coating on cast steel rolls by electro-spark deposition, International Journal of Minerals, Metallurgy and Materials.  16, 6 (2009) 707-713
Xiong, Microstructure and properties of TiC coating by vibrating electrospark deposition, Key Engineering Materials. (2008) 373-374

Materials and Methods 2.1.
One issue with materials used in 3D printing is that they don't have the same mechanical strength as more resistant materials [9].
Hammas, "Evaluation of Different Materials and Techniques Used for Repairing of Digital Denture Base," Al-Azhar Assiut Dental Journal, vol. 6, pp. 1-11, 2023
Lee, "Shear bond strength of provisional repair materials bonded to 3D printed resin," Journal of Dental Sciences, vol. 16, pp. 261-267, 2021
Helal, et al., "Impact of different surface treatments and repair material reinforcement on the flexural strength of repaired PMMA denture base material," Dental Materials Journal, vol. 39, pp. 471-482, 2020

Gnanamoorthy, Corrosion studies on materials of construction for spent nuclear fuel reprocessing, Journal of Nuclear Materials 203 (1993), 73–82
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Simmons, Overview: high-nitrogen alloying of stainless steels, Materials Science and Engineering A 207(1996) 159-169
Gnanamoorthy, Influence of prior deformation on the sensitization of AISI Type 316LN stainless steel, Journal of Nuclear Materials 208 (1994) 251-258
Dayal, Influence of chemical composition, prior deformation and prolonged thermal aging on the sensitization characteristics of austenitic stainless steels, Journal Nuclear Materials 305 (2002) 209-219

Gil 1d 1 Department of Materials Science and Metallurgy, Universitat Politècnica de Catalunya, Avda.
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Journal of Materials Engineering and Performance 2005; 14(6):747-754

During ECAP, the strain and temperature rise will cause recrystallization in the materials, thereby causing the materials properties to change to some degree.
Once the ultrafine-grained materials underwent grain growth, it changed the refined material convert to ordinary coarse-grained material and lost its excellent properties.
Segal, Equal channel angular extrusion: from macro mechanics to structure formation, Materials Science and Engineering A. 271(1999) 322–333
Meyers, Microstructural evolution in copper processed by severe plastic deformation, Materials Science and Engineering A. 410 (2005) 290–298
Hansen, Microstructures and boundary populations in materials produced by equal channel angular extrusion, Materials Science and Engineering A.(2003) 320-342

But it's very hard to prepare membranes from inorganic materials.
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The production of such value-added chemicals requires new basic heterogeneous catalysts as well as optimization of the conventional catalyst materials.
Ordered mesoporous silicas, such as MCM-41 [6-8] and SBA-15 [9, 10] are attractive materials because of their high surface area and ordered arrays of uniform channels.
Additionally, the combination of such alkaline with γ –alumina is one of those stable materials which can withstand in process and enhance the activity of glycerol conversion at given reaction conditions.
EXPERIMENTAL Materials The potassium carbonate (K2CO3), at a purity of 99.5%, was purchased from BDH, UK.
Z., 2011, Instability of SBA-15 to Strong Base: Effects of LiOH Impregnation on its Surface Characteristics and Mesoporous Structure, Journal of Applied Sciences 11 (20), 3510-3514 [11] Ayoub M., Abdullah A, Z., Ahmad M., Sultana S., 2014, Performance of lithium modified Zeolite Y catalyst in solvent-free conversion of glycerol to polyglycerols, Journal of Taibah University for Science 9 [12] Xie, W., Li, H., 2006.