FACULTI OF MECHANICAL ENGINEERING UNIVERSITI MALAYSIA PAHANG BMM3643 (SEM II_2012-13) Assignment #1 1. a) What metals are frequently cast into products? b) What materials are used to produce the expendable patterns for investment casting? c) Explain why a casting may have to be subjected to various heat treatments. (8 marks) Answer a) Cast parts can range in size from a fraction of an inch and a fraction of an ounce to over 30 feet and many tons. Moreover‚
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from which polymers are made • • • Ethylene is polymerised to polyethylene High pressures produce soft‚ low density polyethylene‚ consisting of tangled chains (with molecular masses 100‚000) 5) Identify polyethylene as an addition polymer and explain the meaning of the term Addition polymerisation: a process in which many identical small molecules combine to form one large molecule‚ with no by-products. The small molecules are called monomers‚ while the large molecule is called a polymer. H C C
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different product segments The product segments analyzed in this data report include: Polyester based paints and varnishes (non-aqueous) Vinyl and acrylic polymer based paints and varnishes (non-aqueous) Other polymer based paints and varnishes (non-aqueous) Vinyl and acrylic polymer based paints and varnishes (aqueous) Other polymer based paints and varnishes (aqueous) Other paints and varnishes The report answers the following questions: - What is the current size of the paint and varnish
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The State of the Art of Tissue Engineering – Bone Content 1. Introduction………………………………………………….……………………………………………3 2. Bone Grafts and Bone Graft Substitutes…….……………………………………………4 3. Bone Biology……………………………………………………………………………………………..4 4. Tissue engineering…………………………………………………………………………………..5 4.1. Ideal Scaffold 4.2. Growth factors 4.3. Stem cells 5. Future remarks/Conclusion………………………………………………………………………7 6. Appendix…………………………………………………………………………………………………..8 1. Introductions
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giant molecule formed by the joining of smaller molecules‚ usually by a dehydration reaction. Polysaccharides‚ proteins‚ and nucleic acids are macromolecules. • Polymer: a long molecule consisting of many similar or identical monomers linked together by covalent bonds. • Monomer: the subunit that serves as the building block of a polymer. • Condensation (dehydration) reaction: a chemical reaction in which two molecules become covalently bonded to each other with the removal of a water molecule.
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additives increases the performance of Polymer Polycondensation reaction is carried out under vacuum and high temperature in the range of 292 to 300 deg C. This reaction is carried out with the help of catalyst. EG is evolved in the reaction. Which we collect as crude EG and distilled off further recycling. The catalyst used in the process is Sb2O3 = Max ppm The additives used in polycondensation reaction are SiO2 and SiO2 concentration in polymer is Max PPM and that of is Max PPM Generally
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Transmission electron microscopy (TEM) indicated that hybrid nanoparticles were spherical in shape and polymer core was coated by lipid shell. The stability studies
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behavior and mesoscale strain localization in a short glass-fiber-reinforced epoxy polymer composite during tensile deformation investigated using digital image correlation A. Godara‚ D. Raabe * Max-Planck-Institut fu¨r Eisenforschung‚ Max-Planck-Str. 1‚ 40237 Du¨sseldorf‚ Germany Received 6 March 2006; received in revised form 21 December 2006; accepted 11 January 2007 Available online 26 January 2007 Abstract Advanced polymer composites are used in various fields such as light-weight automobile‚ aerospace
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tubes at 700-1000 degrees C at just above atmospheric pressure. * This is used to break down longer chains of unsalable hydrocarbons into smaller salable hydrocarbons. Polymers: * Mer is the Greek word for unit‚ polymer is the term used to describe a substance made by joining many units together. * 2 classes of polymers based on how the mers are joined together. * Addition – mers joined without the loss of atoms (presence of unsaturated carbons). * Condensation – mers joined through
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solution to form ethylene glycol. Ethene can also react with oxygen‚ with a copper chloride catalyst and at 150oC‚ to form vinyl chloride (chloro-ethene) Identify that ethylene serves as a monomer from which polymers are made Ethylene is the monomer which is converted into the polymer polyethylene by the process of polymerisation (chemical reaction where many small identical molecules join together to form one large molecule). Identify data‚ plan and perform a first-hand investigation to compare
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