[Determination of the conversion of styrene with UV spectroscopy in microemulsion polymerization induced by ultrasound].
The determination of the conversion of styrene with UV spectroscopy was studied in microemulsion polymerization induced by ultrasound. The effects of SDS, pentrol and polystyrene on the styrene spectra were discussed. The experimental results show that the concentration of styrene in microemulsion polymerization system can be determined quantitatively at the wavelength of 247nm by UV spectroscopy, and the relationship between the styrene concentration and the absorbence is linear in the range of 9.7 x 10(-6) mol x L(-1)-6.95 x 10(-5) mol x L(-1), meanwhile the molar absorptivity is 1.384 x 10(4) L x mol(-1) x cm(-1). The SDS and pentrol presented in microemulsion polymerization system have no effects on the determination of the conversion of styrene. Polystyrene, a resultant in the process of microemulsion polymerization, could be removed by adding 95% alcohol to the microemulsion polymerization system and making polystyrene to be precipitated. Residual polystyrene does not affect the determination of the concentration of styrene. Comparing the results of UV spectroscopy with those of the chemical analysis and gravimetric analysis, the determination of the conversion of styrene by UV spectroscopy is feasible, and the process is simple and easy.
Wang
Ya-Qiong
YQ
College of Chemistry and Chemical Engineering of Yangzhou University, Yangzhou 225002, China. yqwang@mail.yzu.edu.cn
Xin
Hong-Qun
HQ
Xu
Wen-Lin
WL