聚碳酸酯
甲醇
溶剂
化学
双酚A
碳酸二甲酯
粘度
傅里叶变换红外光谱
作文(语言)
核化学
分析化学(期刊)
有机化学
化学工程
材料科学
复合材料
环氧树脂
哲学
工程类
语言学
作者
Chandrakant Sharad Bhogle,Aniruddha B. Pandit
标识
DOI:10.1016/j.ultsonch.2019.104667
摘要
The present work demonstrates an attempt to depolymerize Polycarbonate (PC) at room temperature, which otherwise requires extreme temperature and pressure conditions. It was achieved by the use of ultrasound to intensify the methanolysis reaction of PC. Use of ultrasound showed a significant enhancement in the rate of methanolysis which leads to a reduction in the reaction time from 45 min to 15 min to depolymerize 5 g PC at 30 °C by using 0.1 g NaOH and THF to methanol ratio equaling 3 (w/w). Bubble dynamic study also leads to a conclusion that the highest cavitational enhancement can be achieved at THF to methanol ratio equaling 3 (w/w) which might be due to the fact that this solvent mixture exhibits the least viscosity at this composition. The effect of various parameters such as temperature, NaOH concentration, ultrasonic input power and solvent composition were investigated. The products obtained were bisphenol-A(BPA) and dimethyl carbonate (DMC) which were characterized by Fourier Transform Infrared Spectroscopy (FT-IR) and gas chromatography (GC) respectively.
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