Crystallization of Syndiotactic Polystyrene in β-Form. 2. Quantification of Stacking Faults in the Solution-Grown Single Crystals

Autor:	Ken-ichi Katayama, Noritaka Hamada, Shinzo Kohjiya, Masaki Tsuji, Masatoshi Tosaka
Rok vydání:	1997
Předmět:	Polymers and Plastics Annealing (metallurgy) Organic Chemistry Stacking Isothermal process law.invention Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry law Tacticity Materials Chemistry Molecular mechanism Polystyrene Crystallization Electron microscopic
Zdroj:	Macromolecules. 30:6888-6892
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma9705578
Popis:	The probability of the presence of stacking faults in the β-form single crystals of syndiotactic polystyrene, which were grown isothermally from a dilute solution at a temperature ranging from 150 to 210 °C, was estimated from the mean half-breadth of the streaked reflections. The probability was also estimated by counting the number of the faults recorded in the dark-field and the high-resolution electron microscopic images. The probability showed weak dependence on crystallization temperature, with its maximum value at 165 °C. When the single crystals grown at 165 °C were annealed isothermally even at 260 °C, only a small decrease in the amount of stacking faults was detected. The molecular mechanism of and difficulty in eliminating the stacking faults by annealing were discussed on the basis of the structural model of the fault.
Databáze:	OpenAIRE
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