کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5205155 | 1381987 | 2007 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers. Part II. Polypropylene matrix](/preview/png/5205155.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 92, Issue 2, February 2007, Pages 299-309
Journal: Polymer Degradation and Stability - Volume 92, Issue 2, February 2007, Pages 299-309
نویسندگان
Sameh A.S. Alariqi, A. Pratheep Kumar, B.S.M. Rao, R.P. Singh,