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Degradation in Thermal Properties and Morphology of Polyetheretherketone-Alumina Composites Exposed to Gamma Radiation

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Abstract

Sheets of polyetheretherketone (PEEK) and PEEK-alumina composites with micron-sized alumina powder with 5, 10, 15, 20, and 25% by weight were fabricated, irradiated with gamma rays up to 10 MGy and the degradation in their thermal properties and morphology were evaluated. The radicals generated during irradiation get stabilized by chain scission and crosslinking. Chain scission is predominant on the surface and crosslinking is predominant in the bulk of the samples. Owing to radiation damage, the glass transition temperature, T g increased for pure PEEK from 136 to 140.5 °C, whereas the shift in T g for the composites decreased with increase in alumina content and for PEEK-25% alumina, the change in T g was insignificant, as alumina acts as an excitation energy sink and reduces the crosslinking density, which in turn decreased the shift in T g towards higher temperature. Similarly, the melting temperature, T m and enthalpy of melting, ΔH m of PEEK and PEEK-alumina composites decreased on account of radiation owing to the restriction of chain mobility and disordering of structures caused by crosslinks. The decrease in T m and ΔH m was more pronounced in pure PEEK and the extent of decrease in T m and ΔH m was less for composites. SEM images revealed the formation of micro-cracks and micro-pores in PEEK due to radiation. The SEM image of irradiated PEEK-alumina (25%) composite showed negligible micro-cracks and micro-pores, because of the reinforcing effect of high alumina content in the PEEK matrix which helps in reducing the degradation in the properties of the polymer. Though alumina reduces the degradation of the polymer matrix during irradiation, an optimum level of ceramic fillers only have to be loaded to the polymer to avoid the reduction in toughness.

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Acknowledgments

The authors express their deep sense of gratitude to Dr. Baldev Raj, Director, Indira Gandhi Centre for Atomic Research for his keen interest and constant encouragement throughout the course of this work. The authors wish to thank Ms. M. Radhika, Physical Metallurgy Division, IGCAR for her help in SEM analysis and Mr. U. Veeramani, Reprocessing R&D Division for his help in irradiating the samples. This work forms a part of the thesis to be submitted by one of the authors, Mr. Falix Lawrence to the Indian Institute of Technology Madras, Chennai for the award of Ph.D. degree.

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Authors and Affiliations

  1. Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    Falix Lawrence, Satyabrata Mishra, C. Mallika, U. Kamachi Mudali & R. Natarajan

  2. Safety Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    D. Ponraju

  3. Department of Metallurgy and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    S. K. Seshadri & T. S. Sampath Kumar

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  1. Falix Lawrence
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  2. Satyabrata Mishra
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  3. C. Mallika
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  4. U. Kamachi Mudali
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  7. S. K. Seshadri
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  8. T. S. Sampath Kumar
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Correspondence to C. Mallika.

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Lawrence, F., Mishra, S., Mallika, C. et al. Degradation in Thermal Properties and Morphology of Polyetheretherketone-Alumina Composites Exposed to Gamma Radiation. J. of Materi Eng and Perform 21, 1266–1274 (2012). https://doi.org/10.1007/s11665-011-0025-y

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  • DOI: https://doi.org/10.1007/s11665-011-0025-y

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