José Volponi - Academia.edu (original) (raw)

Uploads

Papers by José Volponi

Research paper thumbnail of Use of Oxidation Onset Temperature Measurements for Evaluating the Oxidative Degradation of Isotatic Polypropylene

The widespread use of polymeric materials in many applications requires polymers that are weather... more The widespread use of polymeric materials in many applications requires polymers that are weather resistant. The aim of this study is to examine the usefulness of oxidation onset temperature measurements as a tool for evaluating oxidative degradation of isotatic polypropylene. Differential scanning calorimetry was used to measure the oxidation onset temperature in formulations of isotatic polypropylene containing different concentrations of light and thermal stabilizers after aging in a Weather-Ometer. Oxidation onset temperature gave better results than oxidation induction time for evaluating the degradation of isotatic polypropylene during aging in a Weather-Ometer. However, both tests showed a poor correlation with the appearance of cracks seen by optical microscopy.

Research paper thumbnail of The use of differential photocalorimetry to measure the oxidation induction time of isotatic polypropylene

Polymer Testing, 2004

The widespread use of polymeric materials in many applications requires polymers which are weathe... more The widespread use of polymeric materials in many applications requires polymers which are weather resistant. The aim of this study is to examine the usefulness of oxidation induction time (OIT) measurements by differential photocalorimetry (DPC) as a tool for ...

Research paper thumbnail of Use of Oxidation Onset Temperature Measurements for Evaluating the Oxidative Degradation of Isotatic Polypropylene

The widespread use of polymeric materials in many applications requires polymers that are weather... more The widespread use of polymeric materials in many applications requires polymers that are weather resistant. The aim of this study is to examine the usefulness of oxidation onset temperature measurements as a tool for evaluating oxidative degradation of isotatic polypropylene. Differential scanning calorimetry was used to measure the oxidation onset temperature in formulations of isotatic polypropylene containing different concentrations of light and thermal stabilizers after aging in a Weather-Ometer. Oxidation onset temperature gave better results than oxidation induction time for evaluating the degradation of isotatic polypropylene during aging in a Weather-Ometer. However, both tests showed a poor correlation with the appearance of cracks seen by optical microscopy.

Research paper thumbnail of The use of differential photocalorimetry to measure the oxidation induction time of isotatic polypropylene

Polymer Testing, 2004

The widespread use of polymeric materials in many applications requires polymers which are weathe... more The widespread use of polymeric materials in many applications requires polymers which are weather resistant. The aim of this study is to examine the usefulness of oxidation induction time (OIT) measurements by differential photocalorimetry (DPC) as a tool for ...

Log In