Artigo de peri??dico
Mechanical, thermal and morphological characterization of polypropylene/biodegradable polyester blends with additives
Registro en:
0142-9418
28
10.1016/j.polymertesting.2009.07.006
Autor
ROSA, D.S.
GRILLO, D.
BARDI, M.A.G.
CALIL, M.R.
GUEDES, C.G.F.
RAMIRES, E.C.
FROLLINI, E.
Resumen
The (bio)degradation of polyolefins can be accelerated by modifying the level of crystallinity
or by incorporation of carbonyl groups by adding pro-oxidants to masterbatches or
through exposure to ultraviolet irradiation. In this work, we sought to improve the
degradation of PP by adding cobalt, calcium or magnesium stearate to Ecoflex , PP or
Ecoflex /PP blends. The effect of the pro-oxidants on biodegradability was assessed by
examining the mechanical properties and fluidity of the polymers. PP had higher values for
tensile strength at break and Young???s modulus than Ecoflex , and the latter had little
influence on the properties of PP in Ecoflex /PP blends. However, the presence of prooxidants
(except for calcium) reduced these properties. All of the pro-oxidants enhanced
the fluidity of PP, a phenomenon that facilitated polymer degradation at high
temperatures.