Investigation of Crystallization of PPS by Employing Synchrotron Radiation

Abstract

Abstract: This papar is about the investigation of the isothermal crystallization process by means of the X-ray scattering of synchrotron radiation. Through experiments, we determined the curve of small and wide angles scattering intensity and maximum of scattering peak moved to smaller angle as the crystallization temperature goes high. From the resolution charts which were gained different T_ctemperature from the determination of PPS SAXs and WAXS, one can calculate the smallest value of PPS crystallization speed (t_1/2) which is 0.47 min and corresponds to T_ctemperature 189℃. The crystallization speed is rather slow at temperature below 100℃ and above 250℃. Long Period increases as the temperature goes high and goes down. When the temperature goes near to 250℃, the result of determining density tells us the density can increase greatly. From the break-point on the Q-Tcurve in the range of 30-225℃ one can find out T_gtemperature of PPSis 89 ± 5℃ (heating speed is 10℃/min). According to formula (3) at T_gtemperature, the difference of the thermal expansion coefficient of PPSbetween crystals and amorphous regions is delta alpha, Δa'=(a_a' -a_c')=(0.76+0.03)×10^-2℃^-1.

Key words: PPS, Synchrotron radiation, Crystallization

TrendMD:

Lin Dehou, P. B?secke, H. G. Zachmann. Investigation of Crystallization of PPS by Employing Synchrotron Radiation[J]. Chem. J. Chinese Universities, 1989, 10(2): 186.

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Investigation of Crystallization of PPS by Employing Synchrotron Radiation

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