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24 results on '"Tan, Qun"'

17. Thermal properties and morphology of crystal in nylon 1010 formed isothermally at melting peak temperature

Author

Fu Shuren, Yang Yuqin, Tan Qun, and Zhang Guanghua

Subjects
Crystal, Crystallography, Electron diffraction pattern, Morphology (linguistics), Materials science, Electron diffraction, Transmission electron microscopy, Condensed Matter::Superconductivity, Thermal, Physics::Optics, Single crystal, Isothermal process
Abstract

Thermal properties and morphology of crystal in NYLON 1010 formed isothermally at melting peak temperature were studied by using DSC, TEM and ED. It turns out that the crystal on the time scale of the DSC experiment is stable, which is not transformed from the crystal with low melting point. Its electron diffraction pattern shows symmetrical and clear electron diffraction spots of single crystal and is proved to be the electron diffraction pattern of single crystal by means of index with parameters of unit cell of Nylon 1010

Published
1993
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18. Solid-state crystallization and thermal relaxation in nylon 1010

Author

Fu Shuren and Tan Qun

Subjects
Exothermic reaction, Materials science, Annealing (metallurgy), Isothermal crystallization, Solid-state, Physics::Optics, Thermodynamics, Atmospheric temperature range, law.invention, law, Condensed Matter::Superconductivity, Long period, Thermal relaxation, Crystallization
Abstract

Quenched nylon 1010 was taken as a sample. Through demonstration that the exothermic peak in the DSC curve is a cold-crystallization peak, the effects of isothermal-crystallization periods and isochronal-crystallization temperatures on the cold-crystallization peak were studied. The effects of annealing temperatures and periods on the thermal relaxation peak were studied. It turned out that the rate of solid-state crystallization is higher in a short period of isothermal crystallization than that in a long period, which possibly results from new hydrogen-bond formation. The solid-state crystallization proceeds easily at higher temperature; the optimum crystallization temperature is 315 K. The temperature range between 277 K and 284 K is a sensitive one as concerns thermal relaxation, the most sensitive point being 281 K.

Published
1991
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