ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The reaction between Et3Al and TiCl4 is discussed, with emphasis on the effect of temperature, concentration, stoichiometry, and order of component addition on the ability of products to catalyze the isotactic polymerization of styrene. A well-defined peak in relative catalyst activity becomes apparent when the interaction of these variables is followed by measuring the average oxidation state of titanium. Experimentally, the polymerization is first-order with respect to styrene and titanium, although efficiency of Ti use is small. The mode of polymerization is characterized by a lower activation energy for active site generation and a higher activation energy for termination than is typical of free-radical polymerization. A convenient procedure for laboratory preparation of isotactic polystyrene employing the Et3Al/TiCl4 catalyst is given.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1960.1204514520
Permalink
