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Effect of titanium compounds on thermooxidative properties of stabilized polypropylene
Author(s) -
Kresta Jiří,
Majer Josef
Publication year - 1969
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.1969.070130905
Subject(s) - titanium , polypropylene , induction period , degradation (telecommunications) , hydrogen chloride , thermal stability , polymer , thermal oxidation , catalysis , chloride , antioxidant , materials science , polymer degradation , hydrogen , chemistry , titanate , chemical engineering , organic chemistry , polymer chemistry , telecommunications , ceramic , silicon , computer science , engineering
The effect of titanium compounds on thermooxidation stability of stabilized polypropylene was studied. It was found that the presence of titanium compounds shortens the induction period of PP oxidation. This phenomenon is brought about by the thermal reactions of titanium compounds with antioxidants which take place during polymer processing. The first step is the reaction of TiCl with OH groups of phenolic antioxidant, which gives rise to a colored titanate and HCl. Hydrogen chloride functions as a Friedel‐Crafts catalyst for degradation and dealkylation of phenolic antioxidants. The products of degradation have a very low stabilization efficiency. Hydrogen chloride acceptors suppress antioxidant degradation and increase the polymer stability even in the presence of small amounts of titanium compounds.