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Eucalyptus lignin as stabilizer for PP and HDPE in environmental aging

Grant number: 12/11284-7
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): August 01, 2012
Effective date (End): July 31, 2013
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Marco-Aurelio de Paoli
Grantee:Bruno Tavares Luppi
Home Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:10/17804-7 - Polymeric composites, AP.TEM

Abstract

In this project the stabilizing activity of eucaliptus lignin towards polyolefins will be investigated. Eucaliptus lignin has a high concentration of chemical groups with antioxidant activity, in comparison to other vegetal species. This lignin is a byproduct of the Kraft bleaching process used to produce cellulose from Eucaliptus wood. For this study different formulations of polypropylene, PP, and high density polyethylene, HDPE, will be prepared containing lignin and a secondary stabilizer. These will be aged by environmental exposure. The formulations will be prepared by extrusion and the test samples by injection molding. The mechanical properties and chemical characteristics of the samples will be monitored by tensile and flexural tests and infrared spectroscopy analysis. Moreover, a thermogravimetric analysis will be made to verify the thermal stability variation of the compounds when lignin is used as primary antioxidant. (AU)

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