Photographic Light Scattering by Polyethylene Films

Abstract

The photographic light scattering technique permits a measurement of the size, anisotropy, radial periodicity, packing, and internal structure of polymer spherulites. The theory of some of these effects is described, and experiments are presented showing changes occurring in the melting and growth of spherulites.

Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets

“…The ensemble of optically anisotropic particles is not a trivial object for the evaluation of its light scattering characteristics [1]. This issue becomes even more complicated if to consider liquid crystal (LC) droplets [2][3][4][5][6][7], for example, polymer-dispersed liquid crystal (PDLC) films because orientation structure within the droplets is commonly inhomogeneous.…”

Thermodynamics of Systems Containing Flexible-Chain Polymers

“…Four Debye functions exist for anisotropic particles: Pi, P i , Fit, and pII Ir' (Kerker, 1969; In Ftayleigh-Debye's approximation, light scattering has been studied on 0 anisotropic spheres (spherolites) (Stein and Rhodes, 1960 Volkov and Baranov (1968) provide reviews of light scattering on anisotropic particles.…”

Recent Advances in Rheo-Optical Studies of Polymers in the Solid State

“…14 The interpretation of light scattering patterns was accomplished using the theory for scattering from anisotropic spheres. 15 This permitted the rapid measurement of spherulite size during the course of crystallization. 16 The determination of the number, as well as the size of spherulites required the ability to theoretically account for disorder of crystal orientation within spherulites 17 · 18 and for interspherulitic interference.…”

“…54 • 55 The intensity of scattering also increases with time during the course of crystallization. In addition to R 5 , this also depends upon N 5 and upon the spherulite anisotropy (aR -aT)s where IXR and aT are the radial and tangential polarizabilities of the spherulite according to the approximate equation 15 …”