Die Makromolekulare Chemie · 1978 · 14 citations · 2 references
Natural SciencesBiochemistryChemistryOrganic ChemistryPolymer ChemistryPolymer MaterialsPolymer AnalysisPolymer Chain ConformationPolymer CharacterizationPolymer StructurePolymer SynthesisPolymer ThermodynamicsMacromolecular Complex FormationMolecular Weight DeterminationOrganolithium CompoundsRelative Activity Measurement
Abstract Molecular weights and structural characteristics of the polymers formed in the system isoprene/oligoisoprenyllithium (OILi)/ N , N , N ′, N ′‐tetramethylethylenediamine (TMD)/hexane (mole ratio TMD/OILi‐0,01) at various conversions at −30°C were determined. The applied conditions made it possible to judge the relative activity of various types of growing chains. The results obtained suggest an opposite influence of the complex formation with respect to the associated and non‐associated organolithium compounds. It was found that the former are activated (in comparison to the non‐complexed associates), whereas the latter (in comparison to the non‐complexed monomeric forms M n Li) become less active by complex formation. The possible causes of this different behaviour are considered.
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