Advanced Polymer Chemistry by Chanda

By Chanda

This quantity employs a pragmatic, problem-solving method of figuring out the exact chemistry, kinetics and mechanisms of polymer synthesis. It offers a entire research of the equipment of synthesis and strategies of characterization particular to polymers. There are over 2000 equations, literature references, drawings, illustrative examples, workouts, and worked-out difficulties and solutions to enhance crucial innovations mentioned through the textual content.

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This results in an increase in the number of intermolecular contacts and in the sum of intermolecular attractions. In the stressed condition, a rubber is thus harder than in the unstressed condition. The aligned configuration, however, represents a less probable state or a state of lower entropy than a random arrangement. The aligned polymer chains therefore have a tendency to return to their randomly coiled state. The large deformability of elastomeric materials is due to the presence of a certain internal mobility Introductory Conceptsand Definitions 35 that allows rearranging the chain orientation, the absence of which in linear chain plastic materials (at normal temperature) constitutes the essential difference between the two groups.

The cross-links in elastomers are typically a few hundred carbon atoms apart. 6 Assumingthat each cross-link produced by vulcanization [Fig. 4(b)] contains an average of two sulfur atoms, calculate the sulfur content vulcanizednatural rubber that is 50%crosg-linked. ) Answer : Molar mass of isoprene [Fig. 4(a)], CsHs 5×12 + 8×1 = 58g/mol Accordingto representation in Fig. 4(b), each sulfide cross-link joins two isoprene units. With x = 2, one sulfur atom, on the average, is required for cross-linking per isoprene repeating unit.

6. What is the acid equivalent of polycaprolactam (nylon-6) with average D_P 500 ? 7. Howwould you determine experimentally whether the polymerization of an unknown monomer was proceeding by a step or a chain mechanism ? 8. (a) What is the functionality of the diglycidyl ether of bisphenol A (I) hardening reaction with diethylene triamine (II)? 9. Each of the following polymers can be synthesized from different monomers (a) -{--O(CH2)sCO--}-¢-~ (b) -(-OCH2 CH2CH2--)w(c) --[--NH-( CH2) 7-CO-]~-,~ Show by equations the overall chemical reactions involved in the synthesis of these polymers.

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