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Unformatted text preview: cules oftenreheated. ure 2.9–2a shows that the can direct dissolution mechanism A degr tence of thisbackbone and various side groups. These the bonded double bond withinlinemacromolecule permits the diagram in a tie line Horizontal (Figureframework phase formation of additional drawn onThe on which atoms are a primary bonds between rubber mechanism in which the solid dissolves d crystal lattice primary bonds between chains The 2.9–2b). macromolecules connecting the compositionare knowntwo can of heated to form a bonds of the as two-phaseby the openingbe thethree-dimensional structures. crosslinks. field periodic unsaturated double melt repeatedly. chains formed surrounding liquid without substantial ch placed in When the crosslink density is low, only a small fraction of the double bonds have been thermosetequilibrium.A polymer (usually composed of a polymer phases crystalline Having atoms or ions arranged on a in dislocation A linear defect in a crysta opened, and the individual polymer chains retain their identity. There are only a “few” three-dimensional network of covalently bonded atoms) primary bonds between chains. As the crosslink density increases, the order. chains individual tilt boundary A boundary composed of edge responsible for plastic deformation. three-dimensional lattice having long-range that does not melt structure begins to lose their identity and the when reheated.resemble a three-dimensional network of dislocations of the same sign stacked vertically above one primary bonds. This 3-D primary bond structure is characteristic of many polymers that tie line Horizontal line drawn on a phase diagram in a do not form aAs a or thermoset all of the extra half planes being another. melt, result of polymers. two-phase field connecting the composition of the two in one portion of the crystal, a tilt is created. phases in equilibrium. HHRHHHRH HHRHHHRH time-dependent AC boundary composed of CedgeC that occurs CCCCC CCC C tilt boundaryC C deforma...
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This note was uploaded on 02/25/2013 for the course PHYS 2202 taught by Professor Sowell during the Spring '10 term at Georgia Institute of Technology.

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