Mechanism of spherulitic crystallization as deduced from observations of partially crystallized glassy polystyrene
| Autor: | Gregory S. Y. Yeh, S. L. Lambert |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Materials science
Polymers and Plastics Nucleation Nodule (medicine) macromolecular substances General Chemistry Condensed Matter Physics law.invention Crystallography chemistry.chemical_compound Electron diffraction chemistry law Transmission electron microscopy Tacticity Materials Chemistry medicine Polystyrene Crystallization medicine.symptom Thin film |
| Zdroj: | Journal of Macromolecular Science, Part B. 6:599-619 |
| ISSN: | 1525-609X 0022-2348 |
| Popis: | Thin films of isotactic polystyrene partially crystallized from the glassy state were studied in detail by means of transmission electron microscopy and electron diffraction. Initial nucleation and growth stages of spherulitic fibrils (or lamellae) were illustrated clearly by using novel techniques, such as Au decoration, and novel specimens such as thin films containing holes. Spherulitic nucleation begins with the crystallization of a liquid-crystal-like nodule or a group of these nodules merging to form a spherulitic center. Fibrils or lamellae grow and fan out from the nucleus by additional incorporation of maturing nodules. Proliferation of fibrils is essentially a space-filling process through the crystallization of uncrystallized nodules or nodules that were left behind by growing fibrils which had initiated earlier. The deduced mechanism of spherulitic crystallization leads directly to the formation of interlamellar links between neighboring fibrils. However, no extended-chain-type interl... |
| Databáze: | OpenAIRE |
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