Studies on heterogeneous degradation of polypropylene/talc composite: Effect of iron impurity on the degradation behavior

Abstract

In this study, an effect of iron oxide (Fe 2 O 3 ) impurity in talc on degradation behavior of polypropylene (PP)/talc composite was studied using a PP/Fe 2 O 3 model composite sample. The thermal oxidative degradation was performed at 100 C. Although the degradation of a pure PP sample hardly occurred at such temperature, the existence of Fe 2 O 3 induced the PP degradation. The degraded PP part was formed around the Fe 2 O 3 grain in the PP/Fe 2 O 3 sample. It was found from the optical microscope observation that the degraded PP was able to diffuse only within the PP amorphous part. The analysis of the oxidation distribution on the degraded PP surface was performed employing a scanning electron microscope/electron dispersive spectrometer. The result showed that the PP spots in the vicinity of the Fe 2 O 3 grain were unoxidized during the initial degradation process, and the oxidized PP spots were located at around 6 lm distance from the Fe 2 O 3 grain. It was concluded that the degradation was initiated microscopically away from the Fe 2 O 3 grain so that the Fe 2 O 3 had both the abilities to accelerate the decomposition of PP hydroperoxide compounds and to reduce the produced radical species into nonradical products.

Presence of iron in polymers extruded with corrosive contaminants or abrasive fillers

“…However, we did not determine the type of iron oxide dispersed in the polymers. Previous work with talc-reinforced PP contaminated with iron oxide demonstrates that this impurity accelerates the polymer degradation reactions [24] . The iron detected in this work remains dispersed in the polymers during its use and may accelerate the polymer degradation reactions.…”

Impact modification of polypropylene‐based composites using surface‐coated waste rubber crumbs

“…Nevertheless, to improve its mechanical performance, a wide range of materials have been proposed to produce PP‐based composites. Initially, inorganic particles like talc, glass, calcium carbonate, carbon black, and mica were used . Recently, organic fillers such as hemp, flax, cotton, and wood flour attracted a great deal of attention.…”

Protein Sensing and Cell Discrimination Using a Sensor Array Based on Nanomaterial-Assisted Chemiluminescence

“…On the other hand, two metal-containing proteins, Hem (64.5 kDa) and CytC (12.3 kDa), have similar TCL patterns, resulting in the cluster of LDA plots. A plausible explanation is that iron contained in proteins might be oxidized to Fe 2 O 3 , which may have both the abilities to accelerate the decomposition of the intermediate hydroperoxide compounds and to reduce the produced radical species into nonradical products . In addition, we tested BSA samples of different purities purchased from four manufacturers (Figure S7 in the Supporting Information).…”