"Maghnite", a montmorillonite sheet silicate clay, exchanged with protons to produce "H-Maghnite" is an efficient catalyst for cationic polymerisation of many
The polymerization of 2-chloro ethyl vinyl ether (CEVE) catalyzed by the Maghnite-H (Mag-Hþ) was investigated. Mag-Hþ is a Montmorillonite sheet silicate clay exanchanged with protons. It was found that the cationic polymerization of 2-chloroethyl vinyl ether is initiated by Mag-Hþ at 20 C in bulk and in solution. The effect of the amount of Mag-Hþ, the temperature and the solvent was studied. The polymerization rate increased with increase of the temperature and the proportion of catalyst, and it was higher in dichloromethane than that in toluene. It may be suggested that the polymerization is initiated by proton addition to monomer from Mag-Hþ.
The cationic polymerization of 2-méthyl-2-oxazoline was carried out at 08C in acetonitrile using an acid-exchanged montmorillonite as acid solid ecocatalyst (Maghnite-H þ ). The effect of the amount of catalyst, solvent, and times of polymerization on yield and viscosity of polymer was studied. A typical reaction product (PMOX) was analyzed by infrared and nuclear magnetic resonance spectroscopy as well as by gel-permeation chromatography and MALDI-TOF MS. The polymers presented similar spectrometric results and narrow molecular weight distribution. The poly(N-acetyl)iminoethylene was hydrolyzed in acid medium obtaining a linear poly(ethyleneimine).
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