Effect of γ-Dose rate on Biodegradation of γ-Sterilized Biomedical Polyolefins
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The aim of the present study is to study the effect of γ-dose rate on the biodegradation of γ-sterilized polyolefins. Films of isotactic polypropylene, high density polyethylene and ethylene-propylene (EP) copolymer were sterilized under γ-radiation with doses of 10 and 25 kGy. Two different 60Co sources were used with dose rate 600 and 780 Gy h−1. Neat and sterilized samples were incubated in compost and fungal culture environments. The changes in functional groups, surface morphology and intrinsic viscosity in polymer chains were characterized by FT-IR spectroscopy, SEM and viscometric measurements, respectively. It was observed that both γ-degradation and biodegradation processes depend on the dose rate of γ-source. It was found that the biodegradation of γ-sterilized polyolefins in composting and microbial culture environments increased with decreasing the γ-dose rate.
KeywordsPolyolefins Sterilization γ-Dose rate Biodegradation Composting and fungal culture
The authors are grateful Dr. S. Sivaram, Director of National Chemical Laboratory, Pune, for his fruitful discussion and valuable suggestions for this work. Dr. Sameh AS Alariqi is grateful to University of Taiz for financial support.
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