Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix
Article
Alariqi, Sameh A.S., Kumar, A. Pratheep, Rao, B.S.M. Rao and Singh, R.P.. 2007. "Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix
." Polymer Degradation and Stability. 92 (2), pp. 299-309. https://doi.org/10.1016/j.polymdegradstab.2006.10.010
Article Title | Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix |
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ERA Journal ID | 1691 |
Article Category | Article |
Authors | Alariqi, Sameh A.S., Kumar, A. Pratheep, Rao, B.S.M. Rao and Singh, R.P. |
Journal Title | Polymer Degradation and Stability |
Journal Citation | 92 (2), pp. 299-309 |
Number of Pages | 299-309 |
Year | 2007 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0141-3910 |
0144-2880 | |
1873-2321 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.polymdegradstab.2006.10.010 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S014139100600303X |
Abstract | In our previous study we have found the synergistic combinations of stabilizers which follow different mechanisms of stabilization and are approved for food contact and biomedical applications. The present attempt is to test the potentials of those systems in stabilizing γ-sterilized isotactic polypropylene (i-PP). Isotactic polypropylene was melt-mixed with hindered amine stabilizers (HAS), phenolic antioxidants and organo-phosphites (hydroperoxide decomposer) and sterilized with different doses of γ-radiation. Stabilization was monitored in terms of changes in the functional groups (oxidation products), tensile properties, yellowing and surface morphology by FTIR spectroscopy, Instron, colorimetry (reflectance) and scanning electron microscopy (SEM), respectively. The trend in stabilizing the efficiency of binary (1:1), ternary (1:1:1) and quaternary (1:1:1:1) additive systems was confirmed by comparing the stabilizing efficiency of mixtures with and without phenol system as well as with their counter parts of EP copolymer matrix. The binary system of secondary HAS and tertiary HAS, has shown antagonistic effect of stabilization whereas their combination with organo-phosphite has exhibited synergistic effect even at higher doses of γ-sterilization. Due to the oxidation of hindered phenol, phenol systems have shown discoloration and it was reduced by mixing with secondary HAS, tertiary HAS and organo-phosphite. The response of the stabilizer systems is better to ethylene–propylene (EP) copolymer than to i-PP in terms of stabilization. |
Keywords | polypropylene; g-Sterilization; Stabilization; Antioxidants; Hindered amine |
ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
340302. Macromolecular materials | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | National Chemical Laboratory, India |
University of Pune, India |
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