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In‐Reactor Stabilization of Poly(propylene) with Natural Antioxidants
Author(s) -
Oliveira Renato J.B.,
Forrester Amanda M.S.,
Marques Maria F.V.
Publication year - 2011
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.200900122
Subject(s) - polypropylene , polymer , degradation (telecommunications) , materials science , polymerization , extrusion , chemical engineering , polymer chemistry , reactive extrusion , catalysis , natta , polymer science , composite material , organic chemistry , chemistry , telecommunications , computer science , engineering
Poly(propylene) is one the polymers with the widest range of commercial applications, though as all polymers, it is susceptible to degradation reactions. The addition of antioxidants to polymers is the main way to prevent or retard the degradation process. Extrusion is the most used industrial process to mix additives to the polymer, but this technique involves processing under high temperatures and shear, which causes polypropylene to degrade. Therefore, a Ziegler‐Natta catalyst system based on MgCl 2 /TiCl 4 was prepared with morphology control and the antioxidant was added directly in the polymerization medium, thereby producing spherical and stabilized PP.