Isothermal crystallization in solutions of isotactic polypropylene

Баранов, В. Г.; Zhu-chan, Bu; Volkov, T.I.; Frenkel, S.Ya.

doi:10.1016/0032-3950(67)90327-9

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…It can be shown4 that for anisotropic spherulites this maximum occurs at sin -= 4.09 (6) where Am is the wavelength of light and Om,, is the angle of maximum scattered intensity, both measured in the medium. Van Antwerpenl' has shown that values of these two variables measured in air without correction for refraction give spherulite radius results that are well within the error of the measurement.…”

Section: Introductionmentioning

confidence: 97%

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A device for study of polymer crystallization kinetics via real‐time image analysis of small angle light scattering

Culberson

Tant

1993

J of Applied Polymer Sci

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SYNOPSISA two-dimensional position-sensitive detector for real-time small-angle light scattering (RTSALS) of polymers is described. The device performs real-time image analysis of the evolving light-scattering pattern during crystallization. Such an approach provides a means of simultaneously measuring the rate of spherulite growth and the overall rate of crystallization, allowing calculation of nucleation density and/or rate. Although separation of nucleation effects from growth effects typically requires the application of two different experimental techniques, this device is unique in that it allows these two effects to be easily separated using only time-dependent light-scattering data. The device incorporates a CCD camera, a personal computer, and an imaging board as its major hardware components. Software designed specifically for this application performs real-time analysis of the lightscattering pattern at a rate of 1-3 images per second, thus allowing study of even moderately rapidly crystallizing polymers. (More recent software modifications have resulted in a speed enhancement to 5 images per s and further improvement is expected.) Intensities at various scattering and azimuthal angles are plotted at each time. In addition, the average spherulite radius is calculated and plotted. Application of the device is illustrated by measuring the spherulite growth rate of poly (ethylene terephthalate) as a function of temperature. 0 1993

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Section: Introductionmentioning

confidence: 97%

“…First, the value of the spherulite radius determined from eq. ( 6 ) is heavily weighted toward larger spherulites due to the V 2 term in eq. ( 2 ) .…”

Section: Introductionmentioning

confidence: 99%