|131. Simon, P.; Müller, A.H.E.: Molecular Parameters of Hyperbranched Polymers Made by Self Condensing Vinyl Polymerization of Macroinimers, Macrom. Theory Sim. 9, 621 (2000) -- DOI: 10.1002/1521-3919(20001101)9:8<621::AID-MATS621>3.0.CO;2-M|
The molecular weight averages and the degree of branching, DB, of a hyperbranched polymer obtained by self-condensing vinyl polymerization (SCVP) of a macroinimer A-(m)g-B* is calculated by modifying the existing equations for SCVP. The polydispersity is lowered by a factor (g + 1), where g is the degree of polymerization of the macroinimer. DB decreases with g, however, at full conversion the DB of the polymacroinimer is approximately 60% higher than expected from the "dilution" of an AB* inimer with linear m units. This is the result of the existence of a new kind of branched units. The structure of polymacroinimers is similar to the pattern of a highly branched copolymer obtained by self-condensing vinyl copolymerization. However, the polydispersity index and the DB of these two processes are different, for a given molecular weight the polydispersity and the DB of the macroinimer is lower than the corresponding parameters for SCVCP at the same value of g.