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Accelerated degradation of highly loaded polypropylene
Author(s) -
Benavides R.,
GonzálezHernandez R.,
GonzálezCantú M. C.,
ReyesVielma B.,
Billingham N. C.
Publication year - 2003
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.10060
Subject(s) - polypropylene , stearic acid , degradation (telecommunications) , materials science , stabilizer (aeronautics) , elongation , filler (materials) , calcium carbonate , polymer , calcium stearate , ultraviolet , composite material , pulmonary surfactant , chemical engineering , chemistry , organic chemistry , raw material , mechanical engineering , telecommunications , optoelectronics , computer science , engineering , ultimate tensile strength
Abstract The accelerated aging of six formulations of polypropylene highly loaded with calcium carbonate and containing a surfactant additive (stearic acid) as well as an ultraviolet (UV) stabilizer was studied. Degradation was followed by measuring mechanical properties (elongation percentage and impact resistance), the dynamic mechanical behavior and some chemical changes such as molecular weight and carbonyl group formation along with oxidation temperatures, found by chemiluminescence. The addition of 30 phr of filler to the polymer reduced the stability of the mixture, and the stearic acid used to treat the filler enhanced this effect considerably. On the other hand, the addition of the photostabilizer controlled to some extent such negative effects, though not completely. The most stable formulation was the polypropylene containing only the UV stabilizer.