Effect of ultrasonic pretreatment on emulsion polymerization of styrene
Daichi Nagatomo1, Takafumi Horie1, Chizuru Hongo2
1Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokko-dai, Nada-ku, Kobe 657-8501, Japan.
Abstract:
This study investigated the effect of pretreatment of ultrasonic irradiation on emulsion polymerization of styrene to propose a process intensification method which gives high conversion, high reaction rate, and high energy efficiency. The solution containing styrene monomer was irradiated by a horn mounted on the ultrasonic transducer with the diameter of 5mm diameter and the frequency of 28 kHz before starting polymerization. The pretreatment of ultrasound irradiation as short as 1 min drastically improved monomer dispersion and increased reaction rate even under the agitation condition with low rotational speed of impeller. Furthermore, the ultrasonic pretreatment resulted in higher monomer concentration in polymer particles and produced larger polymer particles than conventional polymerization without ultrasonic pretreatment.
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