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Some newer concepts on ethylene/α‐olefin copolymerization on heterogeneous Ziegler‐Natta catalysts
Author(s) -
Wang JianGuo,
Zhang WenBin,
Huang BaoTong
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920630118
Subject(s) - comonomer , copolymer , ethylene , olefin fiber , monomer , diffusion , polymer chemistry , polyolefin , polymerization , natta , materials science , catalysis , thermodynamics , chemistry , polymer , organic chemistry , physics , nanotechnology , layer (electronics)
Unsteady diffusion kinetics, recently advanced by this laboratory, is applied to the examination of some polymerization and molecular chain structure problems. Hitherto deemed “anomalous” phenomena, such as the faster rate of copolymerization of ethylene/α‐olefin than the homopolymerization of ethylene and the enrichment in the incorporation of a higher α‐olefin in its copolymerization with ethylene by a lower α‐olefin, are reasonably explained by unsteady diffusion of monomers. Molecular chain structure of copolymers, such as compositional heterogeneity and its dependence on comonomer incorporation originates from the difference in diffusion coefficients of the monomers. A copolymer composition equation taking into consideration the unsteady diffusion was developed. In cases where simulated curves were compared with experimental curves, good agreements were found.