Studies on Dilithium Initiators. 2. The Bimodal Molecular Weight Distribution in Polyisoprene

Autor:	L. H. Tung, C. J. Bredeweg, G. Y.-S. Lo, A. L. Gatzke
Rok vydání:	1994
Předmět:	Polymers and Plastics Organic Chemistry Solution polymerization Adduct Inorganic Chemistry Dilithium chemistry.chemical_compound Monomer Anionic addition polymerization chemistry Polymerization Polymer chemistry Materials Chemistry Molar mass distribution Isoprene
Zdroj:	Macromolecules. 27:2225-2232
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma00086a037
Popis:	The development of bimodal molecular weight distribution in polyisoprene was studied by GPC analysis of samples taken during the polymerizations initiated by the dilithium initiators reported in paper 1 of this series. Isolation of the individual peaks using selective precipitation techniques was applied on several samples to identify the nature of the peaks in GPC chromatograms. The dilithium initiators were found to react quickly with isoprene monomer to form an adduct. Further polymerization from the adduct was very slow and caused the main peak of the distribution to be slightly broader and lower in molecular weight. The higher molecular weight peak of the bimodal distribution was from the inadvertently present monofunctional initiation
Databáze:	OpenAIRE
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