A polymer is a high molecular mass compound ranging from 5000 to one million and they are formed by the combination of a large number of one or more low molecular weight compounds. The subject of polymer structure and characterization is typically a second course in polymer science. Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. 15. This leads to the important topic of the structure-property relations to which this book is devoted. endstream Glassy polymers are widely used as structural materials in aerospace vehicles, airplanes, automobiles, biomedical devices, and so on. Polymers are very large and very complicated systems; their character ization has to begin with the chemical composition, configuration, and con formation of the individual molecule. xref 0000007147 00000 n Some natural polymers are composed of one kind of monomer. 10. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. >> Polymers in the natural world have been around since the beginning of time. /F1 9 0 R /F2 10 0 R>> A primary reason that polymer properties are different is because the chemical compositions of metals, polymers and ceramics are totally different. In basic terms, a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure. Introduction: Organic polymers are normally insulators, it can be presumed that conducting polymers must have an unusual structure. The general structure of these polymers is shown in Fig. The subjects are logically combined because understanding how structure a ects properties, as measured in characterization, is a key element of polymer materials science and engineering. Polymers serving as drug carrier should Polymers are composed of non-metallic elements, found at the upper right corner of the periodic table. G H I I J K L M N N O P Q R S T U V W X X Y Z [ \ ] ] ^ _ ` a b c d !e "e "f "g "h #h #i #j #k #l $l $m $n $o %p %q %r &s. Polymers are not restricted to monomers of the same chemical composition or molecular weight and structure. There may be extensive van der Waals and hydrogen bonding between the chains. Synthetic Polymer. 0000002800 00000 n What is Polymer? endstream endobj 49 0 obj<. 0 The adoption of definite chemical structures for polymers has had far- reaching practical applications, because it has led to an understanding of how and why the physical and chemical properties of polymers change with the nature of the monomers from which they are synthesized. >> Thursday, February 23, 2017 Institute of Mechanical Systems - Structure Technology 34 Molecular weight -1-Molecular weight: mass of a mole of chains. The word polymer designates an unspecified number of monomer units. 0000007635 00000 n As the side chain becomes longer, the average interchain distance increases.10 This increased spacing between chain For each ⢠Both amorphous and crystalline areas in same polymer. Man-made polymers have been studied since 1832. A Hydrocarbon backbone being a long chain of linked carbon and hydrogen atoms, possible due to the tetravalent nature of carbon.A few examples of a hydrocarbon backbone polymer are polypropylene, polybutylene, polystyrene. Synthetic polymers are those which are human-made polymers. /Font<< 0000001236 00000 n information about structure or properties of polymers. polymer structures Each parameter is important to the properties Each parameter is important to Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014 . These polymers are nearly impossible to soften when heating without degrading the underlying polymer structure and are thus thermosetting polymers. 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