ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Reactivity ratio products for ethylene-propylene copolymerization over catalysts with two sites differing in incorporation and/or reactivity ratio product have been theoretically derived. It is shown that combination of the polymer fractions resulting from two sites can lead to large dyadic reactivity ratio products as determined by nuclear magnetic resonance. The dyadic reactivity ratio product is calculated at several different monomer ratios in the reactor, and compared to the reactivity ratio product obtained from a least-squares fit of the copolymerization equation. When the polymers are compositionally heterogeneous, the reactivity ratios derived from kinetic measurements are not meaningful.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1987.070340719
