Molar Mass Control by Diethyl Zinc in the Polymerization of Butadiene Initiated by the Ternary Catalyst System Neodymium Versatate/Diisobutylaluminum Hydride/Ethylaluminum Sesquichloride

Autor:	Oskar Nuyken, Werner Obrecht, Lars Friebe, Julia Maria Müller
Rok vydání:	2006
Předmět:	Molar mass Polymers and Plastics Chemistry Dispersity chemistry.chemical_element Solution polymerization General Chemistry Zinc Catalysis Polymerization Polymer chemistry Materials Chemistry Ceramics and Composites Living polymerization Ziegler–Natta catalyst
Zdroj:	Journal of Macromolecular Science, Part A. 43:11-22
ISSN:	1520-5738 1060-1325
DOI:	10.1080/10601320500405786
Popis:	The polymerization of 1,3‐butadiene (BD) catalyzed by the ternary Ziegler/Natta catalyst system neodymium versatate (NdV)/diisobutylaluminum hydride (DIBAH)/ethylaluminum sesquichloride (EASC) is investigated in regard to molar mass control by diethyl zinc (ZnEt2). Within the investigated range of ratios of ZnEt2 to NdV, the features of a living polymerization with a reversible exchange of the living polybutadienyl chains between neodymium and zinc are observed. In summary, ZnEt2 can be considered as an efficient molar mass control agent, which has a negligible impact on polymerization rates. In addition to the reduction of molar masses, ZnEt2 also reduces the polydispersity (PDI) and leads to a decrease of the cis‐1,4‐content.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::56ba5d0520bfecbf8b01910b1017ca60 https://doi.org/10.1080/10601320500405786 Zobrazit plný text záznamu Plný text ve formátu PDF