Polymethylmethacrylate‚ or PMMA for short‚ is a polymer consisting of the monomer methyl methacrylate that has been around since the 1930s1. PMMA is a polymer that has a high impact strength‚ is scratch and shatter resistant‚ and is relatively lightweight1. Because PMMA can also be formed into a transparent thermoplastic and has a glass transitions temperature of 130oC‚ this polymer served as a glass substitute in its early uses1. Other beneficial characteristics of Polymethylmethacrylate include
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During swelling and dissolution of polymeric materials‚ the solute molecules diffuse to and occupy positions among the polymer macromolecules. Increasing both the degrees of crosslinking and crystallinity will enhance a polymer’s resistance to these types of degradation since there will be a greater degree of intermolecular bonding between adjacent chains. For linear polymers that are highly crystalline‚ the intermolecular bonds are secondary ones and relatively weak in comparison to the strong
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alternative to rubber could solve both of these problems. At first‚ their goal was to develop a durable elastic strand based on synthetic polymers. In 1940‚ the first polyurethane elastomers were produced. These polymers produced millable gums‚ which were an adequate alternative to rubber. Around the same time‚ scientists at Du Pont produced the first nylon polymers.
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is not intended for building houses and the likes. Every day‚ we throw away large quantities of polymer in the form of plastic bottles‚ cartons‚ and yogurt pots. Experts estimate that 25 percent of polymer waste is unsuitable for recycling for three main reasons; it is economically unprofitable; and it is too dirty. Now‚ researchers from the Latvian Technological Center and the Institute of Polymer Mechanics at the University of Latvia have come up with a solution. Working with Hormigones Uniland
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← Understand the manufacture of sulphuric acid. ← Synthesise the manufacture of ammonia and its salts. ← Understand alloys. ← Evaluate the uses of synthetic polymer. ← Apply the uses of glass and ceramics. ← Evaluate the uses of composite materials. ← Appreciate various synthetic industrial materiala. (H4SO4) ← USES OF SULPHURIC ACID 1. Sulphuric acid is used to produce chemical fertilizer such as ammonium sulphate and potassium sulphate‚ which are highly soluble in water
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Macromolecule is a very large molecule which can get collected in the kidneys. Generally‚ the molecular weight of the macromolecular vehicle is bigger than that of the prodrugs and so this kind of system can achieve the objective. Pro-drugs have the capability to select the goal in the kidney because it can release the active drug by the action of renal enzymes
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polystyrene (PS). This lab was also intended to show the difference between solution process and bulk process and how it affects the yield and appearance of the final product. Polystyrene is a major polymer used for a wide variety of commercial applications‚ and a vast majority of this polymer is synthesized via free-radical polymerization. The polymerization of styrene is often initiated by thermal generation of radical species. For example‚ azo-bis-isobutyronitrile (AIBN) thermally decomposes
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are carbohydrates‚ lipids‚ proteins‚ and nucleic acids. Three of these four macromolecules are polymers. A polymer is made of several repeated small units called monomers. How the polymers are formed is a method called dehydration synthesis in which the water molecule is removed and two monomers are joined together. When the polymers are breaking down it is process called hydrolysis in when the polymer is mixed with a water molecule and disrupts the bonds between the two monomers. The carbohydrates
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|Just about everyone knows that plastic valves‚ pipes‚ tanks‚ and fittings are molded‚ but there ís a bit more to it than that. Knowing something | |about the processes that are used to produce these products will help to make you more knowledgeable in selecting and using them in various | |applications. | |
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mostly of: carbon (c)‚ hydrogen (h)‚ oxygen (o) Monomers vs. Polymers Monomers: single-molecule that may react with similar molecules to form a chain Polymers: a chain of many monomers that are chemically bonded together. How are polymers formed? Dehydration Synthesis (Condensation): two hydrogen atoms and one oxygen atom are removed from the monomers to form water‚ and the two monomers are joined together. How are polymers broken down? Hydrolysis—the reverse of dehydration synthesis
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