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Characteristics of composites
Natural rubber
Characteristics of composites
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School of Materials and Mineral Resources Engineering
1. Introduction
Composite can be defined as two elements working together to produce material. The material produces will be significantly different in physical or chemical properties from the individual components. Composite materials are generally used for constructions, automotive and consumer products. Composite materials can be divided into three type; polymeric, metallic and ceramic composites. Metallic and ceramic materials used in automotive industry and high temperature environments whereas polymeric materials is the common materials used in consumer products.
Nowadays, polymer composites have attracted a great deal of interest . In most cases, fillers are used as additives to improve the mechanical behavior of the host polymeric matrix. Natural rubber (NR) latex is one of a renewable polymeric material displaying excellent physical properties (Sanguansap et. al, 2004). Rubber is widely used due to its high and reversible deformability. It is also cheap, light weight and high in creep resistance and mechanical properties. The reinforcement of elastomers by mineral fillers is essential to the rubber industry because it is yields an improvement in the service life of rubber compounds. The state of filler dispersion, orientation in the matrix, the size and aspect ratio of the particles as well as the interfacial interactions between the organic and inorganic phases have been shown to be crucial parameters in the extent of property improvement. Since the essential modulus and strength of neat rubber are low, an additional reinforcing phase is n...
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...turing, and Application: An Overview J. Compos. Mater. 40(17): 1511-1575.
9.2. Ratha J.P., Chakia T.K., Khastgira D. (2012) Development of Natural Rubber-Fibrous Nano Clay Attapulgite Composites: The Effect of Chemical Treatment of Filler on Mechanical and Dynamic Mechanical Properties of Composites Procedia Chemistry 4 131 – 137. Rubber Technology Centre, IIT Kharagpur, India.
9.3. Sanguansap K., Suteewong T., Saendee P., Buranabunya U., Tangboriboonrat P. (2004) Composite natural rubber based latex Particles : a novel approach * Department of Chemistry, Faculty of Science, Mahidol University, Phyathai, Bangkok 10400, Thailand
9.4. Sethuraj M.R and Mathew N.M (1992). Natural Rubber: Biology, Cultivation and Technology. Elsevier Science Publishers B.V
9.5. Whelan A. and Lee K.S (1979). Development in Rubber Technology-1. Applied Science Publishers
Pinto Reis C., Neufeld RJ., Ribeiro AJ., & Veiga F., 2006. Nanoencapsulation I. Method for preparation of drug-loaded polymeric nanoparticles. Nanomedicine: Nanotechnology, Biology and Medicine, 2, 9-21
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The burning of the materials is a complex process. Combustion of any material requires three components: heat, oxygen and combusting material or fuel. When heat is applied to the composites materials, temperature of the materials increases. At particular temperature, pyrolysis temperature, materials start to decompose, and produce
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Polystyrene is an aromatic polymer, made when you polymerize styrene monomers. To ensure that the nanoparticles do not degrade in the cellular environment and do appear toxic to cells, they compose the nanoparticles from polystyrene. Also, by using polystyrene particles, it is possible to
Natural rubber latex is found in rubber trees, and is a white liquid. According to the American College of Allergy, Asthma and Immunology (ACAAI), a latex allergy occurs when someone's body reacts to one or more of the proteins that are found in latex. (ACAAI) According to Mayo Clinic experts,
Dental composites are widely used for crown preparation and in-lays formation. These materials are similar to those used in direct fillings and are tooth-colored. Their strength and durability is not as high as porcelain or metal restorations and they are more
Denture teeth can be made of acrylic poly(methyl methacrylate) (PMMA) or composite resins. PMMA is a polymer - a material made the from joining of methyl methacrylate monomers. Properties of PMMA include resistance to abrasion, chemical stability and a high boiling point. (Jun Shen et al. 2011). However, weak flexure and impact strength of PMMA are of concern as they account for denture failure. (Bolayir G, Boztug A and Soygun K. 2013). Composite denture teeth are made of a three distinct phases - filler, matrix and coupling agents. Out of the types of composite teeth available, nano-filled composite teeth are preferred. Composite teeth have a PMMA coating around the tooth and a high content of filler particles. This gives them strength, higher resistance to forces than acrylic teeth and provides compete polymerization due to the PMMA coating. (Anusavice, K. J., Phillips, R. W., Shen, C., & Rawls, H. R, 2012). If the interface between the PMMA denture base and PMMA or composite teeth was weak, the denture will not be able to sustain occlusal forces, making the base-teeth interface, an entity of significance.
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