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Effect of Hydrogen, Electron Donor, and Polymerization Temperature on Poly(propylene) Microstructure
Author(s) -
Alshaiban Ahmad,
Soares João B. P.
Publication year - 2012
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201100023
Subject(s) - tacticity , polypropylene , polymerization , materials science , dispersity , polymer chemistry , microstructure , electron donor , ziegler–natta catalyst , hydrogen , chemical engineering , catalysis , chemistry , composite material , organic chemistry , polymer , engineering
Summary: Polypropylene made with an industrial heterogeneous Ziegler‐Natta catalyst was characterized using high temperature GPC, 13 C NMR, and Crystallization Elution Fractionation (CEF). The effect of hydrogen and electron donor during polymerization on poly(propylene) microstructure was investigated at two temperatures. In addition to the expected electron donor effect on polypropylene tacticity, hydrogen was also found to increase polypropylene tacticity. The effect of changing these polymerization conditions on molecular weight and polydispersity was also investigated. Finally, CEF profiles show how the crystallizability of polypropylene increases by adding hydrogen and electron donor to the reactor.