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Polymeric nature of selenium crystallization. II. Crystallization kinetics and secondary crystallization

✍ Scribed by Crystal, Richard G.

Publisher
Wiley (John Wiley & Sons)
Year
1970
Tongue
English
Weight
679 KB
Volume
8
Category
Article
ISSN
0449-2978

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✦ Synopsis

Abstract

The crystallization of elemental selenium has been studied in light of present concepts of crystallization in organic polymers. Bulk‐crystallization kinetic data as measured by a dynamic density technique and spherulite growth‐rate data as measured by optical microscopy are presented for the temperature range 70°C to 160°C. Plots of extent of isothermal crystallization versus time were sigmoidal in shape. Spherulite growth rates were constant for a given temperature and reached a maximum at approximately 130°C. Evidence is presented for secondary crystallization in selenium, and a model is proposed for destruction of chain folds with interlamellar crystallization during the spherulitic‐to‐“metallic” transformation above 100°C.

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Crystallization kinetics of polycapramid
Crystallization kinetics of polycapramide
✍ Inoue, Masakazu 📂 Article 📅 1961 🏛 John Wiley and Sons ⚖ 559 KB

## Abstract The kinetics of the isothermal crystallization of polycapramide (nylon 6) is discussed. Temperature changes in specimens during the course of crystallization are measured. For specimens at 200–210°C., the temperature is 2–3°C. higher than that of the crystallization bath. Below 200°C.,