ISSN:
0887-624X
Keywords:
rare earth coordination catalyst
;
di-n-butylmagnesium
;
polymerization of styrene
;
polymerization kinetics
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A new highly active rare earth coordination catalyst composed of rare earth phosphonate, di-n-butylmagnesium (MgBu), and hexamethyl phosphoramide (HMPA) for the polymerization of styrene has been developed for the first time. High molecular weight polystyrene (M̄ν = 50-70 × 104) in 100% conversion could be prepared at following conditions: [Nd] = 6-8 × 10-4 mol/L, [St] = 3.0 mol/L, Mg/Nd = 11, and HMPA/Mg = 1-1.5 (molar ratio). The catalytic activity of this new catalyst is 3530 g PSt/g Nd. Kinetics study shows that the polymerization rate is of first order with respect to both monomer concentration and catalyst concentration, and activation energy of the polymerization is 40.1 kJ/mol. © 1996 John Wiley & Sons, Inc.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1996.879
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