1.1 DEFINING POLYMERS Polymers are materials of very high molecular weight that are found to have multifarious applications in our modern society. They usually consist of several structural units bound together by covalent bonds [1‚2]. For example‚ polyethylene is a long-chain polymer and is represented by ÀCH2 CH2 CH2 À or ½ÀCH2 CH2 Àn ð1:1:1Þ where the structural (or repeat) unit is ÀCH2ÀCH2À and n represents the chain length of the polymer. Polymers are obtained through
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What I usually do everyday I usually get up at six o’clock in the morning. First‚ I run around the playground near my home with my brothers. As soon as I reach home‚ I take a bath and change my school uniform. Then‚ I have my breakfast‚ and gather my books according to time-table. I take my bag and my lunch box and go out from home and wait a minute school ferry. Finally‚ leave for school. My school starts at 9:00 am. I am usually in time for my class. My class teacher ever eulogizes
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Polymer Chemistry Classification of Polymers – Notes prepared by The most common way of classifying polymers is to separate them into three groups - thermoplastics‚ thermosets‚ and elastomers5. The thermoplastics can be divided into two types - those that are crystalline and those that are amorphous. You may click on the words in the diagram below to learn more about these classifications. Thermoplastics Molecules in a thermoplastic are held together by relatively weak intermolecular
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Many Kids Called Unfit for Adult Trial: Those under 15 often blind to the long-term results of their choices‚ a study says. By Greg Krikorian Published: March 3‚ 2003 in the Sacramento Bee Thousands of juveniles tried as adults in the United States may be incompetent to stand trial because they are emotionally or intellectually unable to contribute to their own defense‚ according to a juvenile-justice study to be released today. The study‚ directed by a University of Massachusetts professor
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Chemistry In Our Daily Life Chemistry is a big part of your everyday life. You find chemistry in daily life in the foods you eat‚ the air you breathe‚ your soap‚ your emotions and literally every object you can see or touch. We live in a world of matter. From the food that sustains our lives to various objects that have built up our physical culture‚ everything is made up of matter. The human body itself is a mixture of matter of differing types. The humans who used materials obtained from nature
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of the presence of a chemical called adenosine‚ in your brain. It binds to certain receptors and slows the nerve cell activity when sleep is signaled. 5. Anaerobic fermentation is also a great concept which is present in the chemistry of everyday life. It is present in yogurt‚ breads‚ cakes and many other baking products. It is the multiplication of certain useful bacteria which increase the size of the food and make it more filling and soft. 6. Soap is formed by molecules with a "head" which likes
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knots‚ but it is capable of attaining 20 knots in short bursts. The maximum reported depth reached by the species is 194 fathoms. It is capable of remaining submerged beneath the surface for 50 minutes‚ although 10 to 15 minutes is more typical. The life span of a blue whale is about 30 years. The calves measure 7 m at birth and weigh about 2 tons. By the time they are a year old‚ the youngsters measure 18 m. Blue whales comprised about 90 percent of the whaling industry’s total catch during the
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Synthetic fibers and synthetic fabrics consist of bulk fibers‚ yarns‚ woven cloth or other textile products manufactured from polymer-based materials such as polyamide (nylon)‚ polyester‚ aramid‚ or other spun thermoplastics. Basic product types include: fibers and monofilaments‚ roving and yarn‚ carded and needlepunched non-wovens‚ braided products‚ rope and cordage‚ webbing‚ blankets or batts‚ sleeves or wraps‚ and thread. Bulk chopped fibers or thin‚ continuous fiber filaments are used typically
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Amendment Essay The Second Amendment is one of the most controversial amendments in today’s society. There are commonly two sides that fightthat the American people have the right to not only carry a gun‚ but to carry any type of gun that they want‚ while anti-gun groups want to get rid of the right to carry a gun all together unless that person is a soldier or police officer. The part of the Second Amendment that is quoted by both sides is always “A well-regulated militia being necessary to
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1. What does it mean when a polymer is crosslinked? Crosslinked is one manner in which monomers link together. In this method‚ separate polymer chains are connected via bonds between the individual polymer chains. 2. We discussed how polymer linking and structure contribute to its properties. How would you expect the density‚ elasticity‚ and rigidity of a polymer that is branched to compare to one that is linear? I would expect the density of the linear polymer to be much higher than the density
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