Isothermal polymer crystallization with visual inspection of morphological modifications can be done under polarized light using optical microscopy (PLOM). In order to render the PLOM quantitative photomultipliers are fitted in the oculars tube of the POLM to quantify the scattered and cross polarized light intensities passing through the polymer melt while crystallization occurs. To avoid the influence of the residual birefringence present in the beam-splitter optics here we propose the construction of a cross polarized quantification plate and fitting it at the analyzers microscope slot. Data from both photomultipliers as transmitted light intensity and cross polarized light intensity are collected, processed and presented on the computer screen via a LabView software. At the same time image of the crystallizing polymer melt is captured by the PLOM CCD camera and presented in the same screen. A comparison of the isothermal crystallization Avrami curves is done between the proposed procedure with that obtained from the conventional DSC technique.
