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

Content Provider	Springer Nature Link
Author	Lawrence, Falix Mishra, Satyabrata Mallika, C. Kamachi Mudali, U. Natarajan, R. Ponraju, D. Seshadri, S. K. Sampath Kumar, T. S.
Copyright Year	2011
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.
Starting Page	1266
Ending Page	1274
Page Count	9
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	21
Issue Number	7
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2011-08-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	degradation irradiation morphology PEEK composite polyetheretherketone thermal properties Tribology, Corrosion and Coatings Engineering Design Characterization and Evaluation of Materials Quality Control, Reliability, Safety and Risk
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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