Elasticity polymer

In this chapter we examine the elastic behavior of polymers. We shall see that this behavior is quite different from the elasticity displayed by metals and substances composed of small molecules. This is a direct consequence of the chain structure of the polymer molecules. In many polymers elasticity does not occur alone, but coupled with viscous phenomena. The combination of these effects is called viscoelasticity. We shall examine this behavior as well. [Pg.133]

To begin, it is essential to rationalize the equilibration of water within the membrane at AP = 0, APs = 0, j = 0, and = 0. The suggested scenario of membrane swelling is based on the interplay of capillary forces and polymer elasticity. In order to justify a scenario based on capillary condensation, isopiestic vapor sorption isotherms for Nafioni in Figure 6.9(a) are compared with data on pore size distributions in Figure 6.9(b) obtained by standard porosimetry.i In Figure 6.9(a), a simple fit function. [Pg.373]

The close connection that exists between polymer morphology and mechanical properties stimulated extensive research in this field. In amorphous polymers, elastic neutron scattering led to important results. Using mixtures of conventional and deuterated macromolecules, the mean square radius of gyration < > of several amorphous polymers in bulk has been determined (237). This... [Pg.62]

Polymer Elasticity - Bungee Jumping Materials Science, Thermodynamics... [Pg.184]

In this section, we describe a procedure by which a class of models for the ionic contribution to swelling can be tested. Our general approach is to assume that swelling forces due to ions are independent of and additive with other well known swelling forces such as polymer elasticity and polymer/solvent interaction. Thus we consider free energy models of form... [Pg.244]

Arridge, R. C. and Barham, P. J. Polymer Elasticity. Discrete and Continuum Models. Vol. 46,... [Pg.155]