Abstract
A novel apparatus and the principle are presented. The small angle light backscattering is used to measure the morphology of polymer blends. In spite of the absorption by the sample of incident light, the scattering from a rough surface and a thick sample are discussed. The backscattering of the sample with a rough surface mainly comes from diffusion (random reflection), which obeys the diffusion speckle theory, and that of the sample with a smooth surface comes from density fluctuation in the internal medium, which corresponds to the Rayleigh scattering theory. The random scattering from the surface can be ignored when the roughness of surface is no more than 0.237 μm. For the thick sample which has a smooth surface, the experimental result shows that the backscattering is almost independent of the thickness of the sample.
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