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Bottleneck for reactive molar mass in the polymerization of propylene oxide initiated with potassium t ‐butoxide
Author(s) -
Yang Pengfei,
Zhu Xuwei,
Yu Yanhong,
Xia Yong mei,
Li Tianduo
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30360
Subject(s) - propylene oxide , polymerization , molar mass , chemistry , alkoxide , chain transfer , polymer chemistry , fourier transform infrared spectroscopy , ethylene oxide , inorganic chemistry , organic chemistry , polymer , chemical engineering , radical polymerization , catalysis , engineering , copolymer
The anionic polymerization of propylene oxide was investigated with potassium t ‐butoxide as an initiator, and the solvent hexamethyl phosphoric triamide was used in controlling experiments. The relative molar mass limit of the products was determined as about 2700, and the CC double bond was found to exist by NMR. In situ Fourier transform infrared spectroscopy was used to monitor the whole polymerization process until the absorbance reached a constant value and the system reached equilibrium. However, propylene oxide still existed in the system, and alkoxide was detected in the reaction system by 23 Na‐NMR. On the basis of these results, we deduced that the residual alkoxide was not active enough to initiate propylene oxide polymerization in the near end of the polymerization. Therefore, there might have been another factor that limited the increase of the relative molar mass of poly(propylene oxide) in addition to chain transfer. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009