6533b7d3fe1ef96bd126024e
RESEARCH PRODUCT
Molecular parameters of hyperbranched polymers made by self-condensing vinyl polymerization. 1. Molecular weight distribution
Michael WulkowDeyue YanAxel H. E. Müllersubject
Condensation polymerPolymers and PlasticsChemistryOrganic ChemistryDispersitySelf-condensationDegree of polymerizationInorganic ChemistryActive centerchemistry.chemical_compoundMonomerPolymerizationPolymer chemistryMaterials ChemistryMolar mass distributiondescription
The molecular weight distribution (MWD) and its moments are calculated for hyperbranched polymers formed by self-condensing vinyl polymerization (SCVP) of monomers (“inimers”) with the general structure AB*, where A is a vinyl group and B* is an initiating group. The calculated MWD is extremely broad, the polydispersity index (PDI) being equal to the number-average degree of polymerization: Pw/Pn = Pn. It is twice as broad as that for the polycondensation of AB2 type monomers. If the fraction of unreacted monomer is not taken into account, the MWD becomes somewhat narrower, P‘w/P‘n ≈ 0.40P‘n. The kinetics of the polymerization process are first order with respect to the concentration of vinyl groups; Pn, Pw, and PDI increase exponentially with time. Comparison of the theoretical results with experimental data indicates that the rate constant of addition of an active center to a vinyl group decreases with increasing degree of polymerization. Since there are two different active centers in SCVP, na...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-11-01 |