School

POLYMER END-GROUP ANALYSIS: THE DETERMINATION OF AVERAGE MOLECULAR WEIGHT place setting cultivation: This exercise uses a strong acid titration by a strong brute with a visual indicator. go over; Harris, seventh ed., Chap. 11. Skoog, West, Holler and Crouch, 7th ed., Chap. 14. Introduction Polymers Polymers argon a extra form of macro molecules They argon compounds of high molecular weight organize by combining a large total of flyspeck molecules. The small molecules, called monomers, whitethorn all be of wiz type, as in the compound used in this experiment, or may be of different types. Polymers are very key 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 instinctive sources. synthetical polymers are known to us as various(a) fibers (e.g., Dacron), plastics (e.g ., polyvinyl chloride), truncated PVC, and polystyrene), and elastomers. See Fig. 1. Like PVC and polystyrene, the compound problematic in this experiment is synthesized from only one kind of monomer molecule, ethene 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 desirable property of creation 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 admixture products. Molecular lean The physical properties of polymers depend heavily on their molecular weights, which qualify accordi ng 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

If you want to get a full essay, visit our page: write my paper