POLYMER END-GROUP ANALYSIS: THE DETERMINATION OF AVERAGE MOLECULAR WEIGHT soil cultivation: This exercise uses a strong acid titration by a strong brute with a visual indicator. turn back; Harris, seventh ed., Chap. 11. Skoog, West, Holler and Crouch, 7th ed., Chap. 14. Introduction Polymers Polymers argon a extra form of macro scraps They ar compounds of high molecular burden organize by combining a large add up of flyspeck molecules. The small molecules, called monomers, whitethorn all be of sensation type, as in the compound used in this experiment, or may be of different types. Polymers are very substantial in biological systems. For example, proteins are composed of intricate sequences of aminic acids, and polysaccharides postulate repeating units of simple sugar molecules. Our everyday lives are also greatly influenced by polymers that are not obtained from indispensable sources. synthetical polymers are known to us as miscellaneous fibers (e.g., Dacron), plas tics (e.g., polyvinyl chloride), truncated PVC, and polystyrene), and elastomers. See Fig. 1. Like PVC and polystyrene, the compound compound in this experiment is synthesized from only one kind of monomer molecule, ethylene glycol. The monomers are joined by elimination of a molecule of piss to form a series of ether linkages.
(n+2) HO-CH2-CH2-OH ? HO-CH2-CH2-[O-CH2-CH2]n-O-CH2-CH2-OH + n body of water The polymer is called either poly(ethylene glycol) (PEG for short), poly(ethylene oxide), or, more properly, poly(oxyethylene). PEG is usually found in the list of ingredients in hair preparations and cosmetics. It is a good lubricator and also has the de! sirable property of being soluble in water. Therefore, PEG is heavily used as a base for therapeutic ointments, and it is used industrially as a lubricator in the formation of textile fibers and metallic element products. Molecular lean The physical properties of polymers depend heavily on their molecular weights, which qualify according to the number of repeating monomer units (the ns in the structures in Fig. 1)...If you want to get a full essay, clubhouse it on our website: OrderCustomPaper.com
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