Die molekulargewichtsverteilung bei der kontinuierlichen anionischen polymerisation

✍ Scribed by Panke, Dietrich

• Publisher: Wiley (John Wiley & Sons)
• Year: 1981
• Weight: 542 KB
• Volume: 182
• Category: Article
• ISSN: 0025-116X
• DOI: 10.1002/macp.1981.021821127

✦ Synopsis

Abstract

Equations are given for the continuous anionic polymerization in a tubular reactor which describe the resulting molecular weight distribution as a function of the size of the mixing zone and of the concentration of chain terminating impurities in the solution of the monomer. Polymerization of styrene and of butyl methacrylate was conducted with different initiator concentrations, and the size of that part of the reactor where backmixing occurs was estimated from the molecular non‐uniformity of the polymers, whereas the degree of polymerization allows the determination of the concentration of the impurity. This latter quantity apparently increases with initiator concentration in the case of methacrylate polymerization and therefore suggests a reaction of the initiator with the ester group to occur. The shape of the molecular weight distribution indicates termination of the growing methacrylate chains, possibly by reaction of living chain ends with ester groups.