In situ stabilization of polypropylene by lignin using a Ziegler-Natta catalyst
Journal Title: Polyolefins Journal - Year 2014, Vol 1, Issue 1
Abstract
A fourth-generation Ziegler-Natta catalyst was prepared to synthesize polypropylene (PP), which was stabilized by in situ polymerization employing lignin as antioxidant. The antioxidant properties of lignin were compared with those of the commercial antioxidant Irganox 1010. The presence of lignin in the reaction medium slightly decreased the catalytic activity of the reaction. The isotacticity index (I.I.) of PP synthesized with lignin (PP-lig) was not affected by the presence of the additive in the reaction medium. The thermal properties, characterized by differential scanning calorimetry, showed slightly decreased degree of crystallinity (Xc), but the melting temperature (Tm) and crystallization temperature (Tc) were not affected when compared with the neat polymer. Lignin showed good activity as a stabilizer by thermogravimetry. The initial temperature of degradation (Tonset) increased when compared to the pure PP and PP stabilized with the commercial antioxidant. The lower carbonyl index of the PP, evaluated by infrared spectroscopy (FTIR) after thermo-oxidative treatment, also revealed the stabilizing action of lignin.
Authors and Affiliations
Maria Marques, Renato de Oliveira, Rafael Araujo, Bruno Amantes
Keywords
Related Articles
- EP ID EP283044
- DOI 10.22063/POJ.2014.889
- Views 137
- Downloads 0
Theoretical models for prediction of mechanical behaviour of the PP/EPDM nanocomposites fabricated by friction stir process
In this study, thermoplastic polyolefin elastomeric (TPO) nanocomposites were fabricated by friction stir processing. The effect of different pin geometries on clay dispersion and mechanical properties of the TPO nanocom...
Homogeneous and heterogeneous oligomerization reactions of olefins with unbridged metallocene catalysts
1-Pentene, respectively 1-hexene, were reacted with 13 homogeneous metallocene catalysts to give linear oligomerization products, predominantly dimers, with selectivities above 90%. The product distributions of the codim...
Expected nucleation effects of carboxylic acid salts on poly(1-butene)
9,10-Dihydro-9,10-ethano-anthracene-11,12-dicarboxylic acid disodium salt (DHEAS) was synthesized and used as a nucleating agent for poly(1-butene) (iPB). The isothermal crystallization kinetics of iPB having different n...
A theoretical reasoning on why coordination catalysts supported on mesoporous supports can produce HDPE crystalline nanofibers but not iPP crystalline nanofibers
Since 1999, when Takuzo Aida proposed the preparation of high density polyethylene (HDPE) crystalline nanofibers through polymerization of ethylene by a Cp2TiCl2/MCM-41 catalyst, many researchers have published various p...
Preparation and characterization of a bionanopolymer film for walnut packaging
To apply the nanomaterial as a component in the packaging material structure, in this research, the carboxymethyl cellulose (CMC)/polyvinyl alcohol (PVA) film were prepared with three levels of nanoclay particles (0.5, 1...