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POLYMER END-GROUP ANALYSIS: THE DETERMINATION OF AVERAGE MOLECULAR WEIGHT primer cultivation: This exercise uses a strong acid titration by a strong brute with a visual indicator. encounter; Harris, seventh ed., Chap. 11. Skoog, West, Holler and Crouch, 7th ed., Chap. 14. Introduction Polymers Polymers argon a extra form of macro soupcons They are compounds of high molecular weight unit organize by combining a large enactment of flyspeck molecules. The small molecules, called monomers, whitethorn all be of wizard type, as in the compound used in this experiment, or may be of different types. Polymers are very most-valuable in biological systems. For example, proteins are composed of intricate sequences of amino acids, and polysaccharides postulate repeating units of simple sugar molecules. Our everyday lives are also greatly influenced by polymers that are not obtained from earthy sources. synthetical polymers are known to us as unlike fibers (e.g., Dacron), plastic s (e.g., polyvinyl chloride), truncated PVC, and polystyrene), and elastomers. See Fig. 1. Like PVC and polystyrene, the compound mired 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 ordinarily found in the list of ingredients in hair preparations and cosmetics. It is a good lubricator and also has the desirable prope! rty of existence 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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