Applications of Syndiotactic Polystyrene

Fiola, Tom; Okada, Akihiko; Mihara, Masami; Nichols, Kevin

doi:10.1002/9780470557006.ch15

Cited by 2 publications

(1 citation statement)

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“…3,9 A second approach focused on mechanical properties and the effect of the phenyl rings on nondestructive radiation energy dissipation. Research focused on syndiotactic polystyrene (sPS) for several reasons 10 :…”

Section: Introductionmentioning

confidence: 99%

Isothermal crystallization kinetics of syndiotactic polystyrene exposed to gamma radiation in vacuum

Chuang

Ting

et al. 2015

J. Mater. Res.

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The effect of gamma radiation in vacuum on the isothermal crystallization kinetics of syndiotactic polystyrene (sPS) was investigated via differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and x-ray diffraction (XRD). Amorphous sPS samples were irradiated in vacuum, heated to 310°C, cooled down to crystallization temperatures (T c s) from 220 to 260°C, and annealed for different times. Upon reheating, overlapping endothermic melting peaks depicted the various crystallization forms, a, b, and b9. The endotherms were resolved using Gaussian functions relating enthalpy changes to the endothermic envelope. Isothermal crystallization kinetic data were analyzed using Avrami's model with Gaussian functions. The extent of crystallization of b and b9 forms increased with increasing crystallization time and temperature, while that of a form decreased. Crystallization half-time followed a modified Arrhenius equation. Crystallization activation energies for the b and b9 forms of sPS increased with increasing radiation doses. The results are compared to those of air irradiated sPS reported in the literature.

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Section: Introductionmentioning

confidence: 99%