Effect of the polydispersity of spherulites upon low-angle scattering of polarized light

SynopsisA theory is presented to account for the effect of the impingement of growing spherulites on their H, small-angle light scattering patterns. The theory is developed on the basis of results of computer-simulated two-dimensional spherulite growth and calculated scattered intensities. The impingement produces a lowering of the intensity of the scattering maximum and the diminishing of the overall sharpness of the scattering peak. The extent of these effects increases with area fraction of spherulites. A procedure is suggested for determining correction factors that may be applied to intensity data obtained during the course of spherulite crystallization. An interpretation is made of the type of average spherulite size determined from the scattering angle of maximum intensity.

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Small‐angle light scattering by random assemblies of incomplete spherulites. Systems with partial degree of volume filling

Tabar

Wasiak

Hong

et al. 1981

J. Polym. Sci. Polym. Phys. Ed.

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Small‐angle light scattering from a distribution of spherulite sizes

Wissler

Crist

1985

J. Polym. Sci. Polym. Phys. Ed.

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Depolarized small‐angle light scattering from spherulites in semicrystalline polymers gives rise to a characteristic cloverleaf pattern. For scattering from a single spherulite, the position of the maximum in scattered intensity is readily related to the spherulite radius. For a distribution of spherulites, the maximum should be related to some characteristic measure of the distribution. It is shown for a wide variety of distributions that this characteristic radius is a ratio of high moments of the size distribution, specifically R* ≈ 〈R7〉/〈R6〉. The shape of the light‐scattering profile should in principal be related to the nature of the spherulite distribution. Calculations of scattering profiles from a variety of distributions fail to demonstrate this, owing to the strong dependence of scattering power on spherulite size. Exceptions are noted for the case of certain bimodal distributions.

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The effect of size, truncation and disorder in optic axes on the small angle light scattering patterns

Prud’homme¹,

Stein²

1977

European Polymer Journal

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Effect of the polydispersity of spherulites upon low-angle scattering of polarized light

Cited by 4 publications

References 5 publications

Small‐angle light scattering by random assemblies of incomplete spherulites. Systems with partial degree of volume filling

Small‐angle light scattering by random assemblies of incomplete spherulites. Systems with partial degree of volume filling

Small‐angle light scattering from a distribution of spherulite sizes

The effect of size, truncation and disorder in optic axes on the small angle light scattering patterns

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