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Effect of aging conditions of neodymium‐based catalysts on cis ‐1,4 polymerization of butadiene
Author(s) -
Mello Ivana L.,
Coutinho Fernanda M. B.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29617
Subject(s) - polymerization , catalysis , polymer , neodymium , polymer chemistry , chemistry , molar mass distribution , 1,3 butadiene , infrared spectroscopy , materials science , chemical engineering , organic chemistry , laser , physics , optics , engineering
The aim of this work is to evaluate the effect of aging conditions catalysts based on neodymium salt on polymerization conversion, catalyst activity, and polymer characteristics. The synthesized catalysts were aged at 10, 25, 40, and 60°C for 24 and 48 h. The polybutadienes were characterized by size exclusion chromatography to determine the molecular weight characteristics and infrared spectroscopy to determine the microstructure. The results showed that the stereoselectivity of active catalyst sites was not affected by the aging conditions. However, the molecular weight increased with aging temperature. The catalysts aged at 25°C showed a trend to attain higher activities than those aged at 40 and 60°C. Moreover, a significant drop on polymerization reaction rate occurred as the catalyst aging temperature increased. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009