A device has been developed for the rapid detection of intensity in two‐dimensional small‐angle light‐scattering patterns. The device utilizes a vidicon detector and a microprocessor. Examples of applications of the device for small‐angle light scattering from thin polymer films are presented.
Quantitative Hv small‐angle light‐scattering (SALS) studies of the melting of poly(ethylene terephthalate) (PET) have been performed. The results are compared with those from differential scanning calorimetry (DSC). It is found that fully grown spherulites melt over a temperature range of about 20°C without change in spherulite size, number, or internal disorder. The decrease in Hv SALS intensity is due to a decrease in spherulitic crystallinity over the melting range. The corrected experimental intensities are lower than, but in reasonable agreement with, the theoretically predicted intensities based on the DSC results. Procedures are presented for the quantitative analysis of Hv SALS intensities from spherulitic systems, including the corrections for the experimental, external disorder, and internal disorder effects.
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