Anionic polymerization of propylene oxide and its kinetics

被引：0
|
作者：
Zhu, Xu-Wei [1 ]
Yang, Peng-Fei [1 ,2 ]
Li, Jun-Ying [1 ]
Li, Tian-Duo [1 ,2 ]
机构：
[1] School of Light Chemistry and Environment Engineering, Shandong Institute of Light Industry, Jinan 250353, China
[2] School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2010年 / 26卷 / 03期
关键词：
Activation energy - Nuclear magnetic resonance spectroscopy - Propylene - Anionic polymerization - Molecular weight - Integral equations - Nuclear magnetic resonance - Potassium compounds;
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摘要：
The polymerization of propylene oxide in hexamethyl phosphoramide (HMPT) was investigated with potassium t-butoxide as initiator. Monodisperse poly (propylene oxide) was obtained (PDI=1.04), then infrared spectroscopic (IR) and hydrogen nuclear magnetic resonance spectrum (1H-NMR) were used to characterize its structure, all the peaks in 1H-NMR spectra was assigned as well. Number average molecular weight was calculated by 1H-NMR and was limited to about 2800. Chain-transfer constants were calculated out and were found to increase with the molar ratio of propylene oxide to potassium t-butoxide, which may be lead to the upper limit of molecular weight. In-situ FT-IR spectroscopy was used to illustrate the anionic polymerization of propylene oxide. According to the calibration of absorbance to concentration, activation energy was worked out to be 38.0 kJ/mol and the kinetic equation was deduced to be.
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页码：15 / 18
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