benefits associated with the use of the supplied polymer material. Therefore adding value to a polymer implies an ability to understand the exact needs of the customers (N.B. – there ARE more than one) and at what point in the downstream value chain the ‘real customer’ is positioned. Example When selling resin compound direct to a moulder of a component for electrical goods‚ the plastic buyer at the moulding company simply wants a good quality polymer which meets the technical specification and at
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The number of cancer cases around the world has been increasing‚ and it is expected to increase to 24 million by 2035. The most commonly used cancer treatment is chemotherapy or chemo. Chemotherapy drugs are strong medicines that work to kill cancer cells. They can be divided into several groups based on factors such as how they work‚ their chemical structure‚ and their relationship to another drug. Knowing how the drug works is important in predicting side effects‚ because chemotherapy drugs kill
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Chitosan (11 KDa) showed a wide endothermic peak over wide range of temperature from 90.6°C to 146.7°C which can be attributed to water evaporation because polysaccharides are hydrophilic polymers that have a strong affinity for water. This result matched with the result of Ujang Z. et al. (2011) (133). And similar to all‚ the PM between CXB and 11 KDa chitosan (11 KDa chitosan:CXB 7:3) showed both the melting point of the CXB and the broad
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Introduction Generally‚ PET can be produced in two steps by one of two ways‚ called the DMT and the TPA processes‚ or the transesterfication and direct esterification routes‚ respectively. Since its commercialization in the 1950’s by DuPont‚ PET was predominantly synthesized out of DMT due to the fact that this monomer‚ compared to TPA‚ was relatively easily purified by distillation. Yet‚ since the 1960’s‚ purified TPA became available by the development of new technologies and gained a lot of importance
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Dry flow in Rotomodling is the time it takes 100 grams of resin powder to pass through a funnel of given dimensions. Powder dry flow properties are important throughout rotational molding because they determine how the polymer distributes itself within the mold and how polymer melts into complex shapes. Dry flow depends mainly on particle shape and size. Bulk density in Rotomodling is the quantity of undisturbed powder than can fit inside a beaker of specified dimensions. It is also a measure
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carbohydrate is an organic molecule containing only Carbon‚ Hydrogen and Oxygen with the general formula Cn(H20)n. They are made up of individual molecules called monomers which are joined together by condensation reactions to make a longer chain called a polymer. Carbohydrates are categorised in to three main groups; monosaccharides‚ disaccharides and polysaccharides. Monosaccharides are single sugars and are sweet tasting soluble substances such as glucose and fructose which are the building blocks
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The Molecules of Cells (Chapter 3 in your textbook) Without water and carbon-based molecules‚ no life as we know it! Carbon: The Backbone of Life • Living organisms consist mostly of carbon-based compounds Also‚ H‚ N‚ O‚ P‚ and S…… • Carbon is unparalleled in its ability to form large‚ complex‚ and diverse molecules. Why? Principal source of carbon on Earth? • Proteins‚ DNA‚ carbohydrates‚ lipids‚ and other molecules that distinguish living matter are all composed of carbon. C21H36N7O16P3S Coenzyme
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identical ______________ blocks linked by __________________ bonds -___________________: smaller molecules that serve as the ________________ blocks for a polymer -________________________ reaction: synthesizing a polymer using ___________________ -involves release of a ____________________ molecule -___________________: breaking down a polymer -involves addition of a _____________________ molecule -___________________: specialized macromolecules that __________________ chemical reactions 4 major
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differ only in the orientation of a single hydroxyl (-OH) group small structural differences lead to large differences in chemical properties starch found in mushrooms (amylopectin) is a polymer of α-glucose – can easily be digested STARCH = DIGESTIBLE Cellulose found in celery is a polymer of β-glucose – cannot be easily digested by most animals CELLULOSE – NOT DIGESTIBLE • Isomers illustrate that structure of a molecule determines the function of that molecule STRUCTURE = FUNCTION
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FORMATION OF GRAINS b) Polycarbonate. To meet the criteria you will need to consider the following: - • Whether the material is a thermoplastic or thermosetting polymer. • The atomic structure associated with this class of polymer‚ NOT the chemical constituents. Polycarbonate is a thermoplastic. Thermoplastics have a linear or branched molecular structure which determines their strength‚ solid
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