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Unformatted text preview: IE 320 - Spring 2003 Bölüm 4 Introduction to Materials Science
4.1 Differentiate between polymorphism and isomerism. 4.7 Below, molecular weight data for some polymer are tabulated. Compute (a) the number average molecular weight, and (b) the weight-average molecular weight. (c) If it is known that this material’s weight-average degree of polymerization is 780, which one of the polymers listed in Table 4.3 is this polymer? Why? (d) What is this material’s number-average degree of polymerization? 2 1 IE 320 - Spring 2003 3 4 2 IE 320 - Spring 2003 Introduction to Materials Science
4.15 (a) Is it possible to grind up and reuse phenol-formaldehyde? Why or why not? (b) Is it possible to grind up and reuse polypropylene? Why or why not? 4.26 Explain briefly why the tendency of a polymer to crystallize decreases with increasing molecular weight. 5 3 ...
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