Small-angle light scattering spherulite radius

Morphology changes were observed by optical microscopy and small-angle light scattering. The pure components exhibit spherulitic structures, each with different orientation of the optic axis with respect to the spherulite radius. Spherulites become disordered and larger with the introduction of small amounts of the second component. Larger amounts of the second component result in a loss of spherulitic order. 

Small-angle light scattering (SALS) is a suitable technique for determining the spherulitic radius, from four-lobe patterns [22,279-282] such as those shown in Figure 4.8. Equations such as the following can be used [280]... 

By means of several optical techniques, viz. small angle laser light scattering (SALLS), optical microscopy, etc, the spherulite structure can be studied. From the photographic scattering pattern the spherulitic radius, R, can be calculated as a function of the crystallization time and/or blend composition [Stein, 1964] ... 

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