Introduction

The discussion of crystallization kinetics, and the mechanisms involved, has so far been limited to quiescent crystallization. In essence, except for polymer structure and composition, the only variable considered was temperature. This has given a limited perspective to the overall subject, since polymers crystallize when subject to applied forces such as hydrostatic pressure, tensile, biaxial and shear deformation among others. Different morphologies and structures result from these types of crystallization. As a result, properties can be drastically altered. The analysis of the crystallization kinetics of polymeric systems when subject to such external forces is the subject of the present chapter. Although this an important area, the literature is not as rich as in some of the other areas that have been discussed. However, the results that have been obtained are interesting and hopefully will stimulate further inquiry.

Effect of hydrostatic pressure

Overall crystallization kinetics

Under hydrostatic pressure the force is applied uniformly in all directions. The discussion will be divided into two parts: the overall crystallization kinetics in this section and spherulite growth rates in the following. The application of hydrostatic pressure increases both the glass and equilibrium melting temperatures. However, since each increases at a different rate the window for crystallization to occur will be altered.