Crystallization analysis fractionation of poly(ethylene-co-1-octene) made with single-site-type catalysts: a mathematical model for the dependence of composition distribution on molecular weight

Published in: Macromolecular Chemistry & Physics, 1998
Volume 199, Issue 9, Pages 1917-1926
Authors: J. Soares, B. Monrabal, J. Blanco, J. Nieto
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A series of seven poly(ethylene-co-l-octene) samples made with a single-site-type catalyst were analyzed by crystallization analysis fractionation (CRYSTAF). The samples have similar average copolymer compositions but differ in their average molecular weights. CRYSTAF results confirm the theoretical predictions of Stockmayer’s distribution: the breadth of the chemical composition distribution is inversely proportional to the number average molecular weight for polymers made with single-site-type catalysts. Stockmayer’s distribution was used to assess the instrumental peak broadening of CRYSTAF. An extension of this treatment for polyolefins made with multiple-site-type catalysts is proposed.

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