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Control of Macromolecular Architecture of Polyamides by Poly‐Functional Agents, 1. Theoretic and Experimental Approaches to Star‐Branched Polyamides
Author(s) -
Yuan Cui Ming,
Di Silvestro Giuseppe,
Speroni Franco,
Guaita Cesare,
Zhang Haichun
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010601)202:10<2086::aid-macp2086>3.0.co;2-w
Subject(s) - polymer chemistry , condensation polymer , bifunctional , polymerization , polymer , monomer , copolymer , macromolecule , molar mass distribution , chemistry , molecular mass , materials science , organic chemistry , biochemistry , enzyme , catalysis
In this first paper of the series, a statistical model for star‐branched polycondensation of AB type monomers in the presence of a polyfunctional agent RA f was completely developed. The analytical expressions obtained for the number‐average ( DP n ) and weight‐average ( DP w ) degree of polymerization, and the dispersion index ( D ) for whole polymer species, linear and star macromolecular chains, were derived as a function of the conversion of the functional group of RA f . An important molecular parameter, mole fraction of star‐branched polymer, was introduced. Numerical examples are reported on the relationship between molecular parameters and conversion of the functional group of RA f . It is illustrated that the molecular weight properties of the linear and star‐branched polymers in the mixture of the products are very important factors for the application of this kind of polymeric materials. Polymerization of 6‐aminocaproic acid was carried out in the presence of terephthalic (T2) and trimesic (T3) acids as tri‐ and bifunctional agents. The molecular weights calculated are in good agreement with those obtained by size exclusion chromatography (SEC).