The nature of the propagation sites in the anionic polymerization of methoxypolyethyleneglycol methacrylates in the presence of Li counterion has been studied through i.r. spectra of the model compounds, Li derivatives of isobutyric acid esters, (CH3)2CLiCOO(CH2CH20),CH 3 with n from 1 to 4, and of
Active site measurements in the coordinated anionic polymerization of propylene
β Scribed by Coover, H. W. ;Guillet, J. E. ;Combs, R. L. ;Joyner, F. B.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1966
- Tongue
- English
- Weight
- 687 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0449-296X
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In order to investigate the effects of an external electron donor on catalyst active sites in propylene polymerization, physical properties of the produced polymers are measured with various techniques. From the thermal analysis and gel permeation chromatography (GPC) measurement, it is found that a
Al~tract--The rate of anionic polymerization of bulk propylene oxide catalysed by potassium alkoxide in the presence of 18-crown-6 ether was followed dilatometrically. Rate constants were obtained at 40, 50 and 60 Β° over a range of crown ether concentrations, so allowing calculation of activation en
A~traet--Temperature dependences of the stereoregularity parameters of the most stereospecific active centres of =-TiCI3:AIEt 3 catalytic system from -25 to 120 and of VCI3--AIEt 3 catalytic system from -15: to 90 c have been measured. It was found that this temperature dependence could be represent