Crystallization of polymers in variable external conditions IV. Isothermal crystallization in the presence of variable tensile stress or hydrostatic pressure

General equations of crystallization in variable conditions have been applied to isothermal crystallization affected by variable tensile stress or hydrostatic pressure. In a system under stress, the crystallization rate involves relaxational and athermal effects, and is controlled by the normal stress difference and the stress rate. Similarily, pressure effects include the hydrostatic pressure and its rate of change. Received: 1 December 1998 Accepted in revised form: 23 March 1999