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Investigation of the effect of aluminum oxide nanoparticle additives and gamma irradiation on the thermal behavior of syndiotactic polystyrene
Author(s) -
Abdeldaym A.,
Elhady M. A.
Publication year - 2019
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.25222
Subject(s) - materials science , polystyrene , irradiation , composite material , oxide , aluminium , nanoparticle , thermal , gamma irradiation , aluminum oxide , tacticity , metallurgy , polymer , nanotechnology , physics , nuclear physics , polymerization , meteorology
Syndiotactic polystyrene (sPS) containing 3, 5, 7, and 10 wt% of aluminum oxide (Al 2 O 3 ) nanoparticles were prepared following the melt‐mixing technique. The thermal behavior of the sPS/Al 2 O 3 nanocomposites was investigated through differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and melt flow index (MFI). The DSC results indicated that for all sPS/Al 2 O 3 nanocomposites, the melting temperature (T m ), the melting enthalpy (ΔH m ), the crystallization temperature (T c ), and the glass transition temperature (T g ) increased with an increase in the Al 2 O 3 nanoparticles content. The TGA analysis indicated that the thermal stability of all nanocomposites is significantly enhanced after the addition of Al 2 O 3 nanoparticles with different contents. The activation energy was determined through two different models: the Coats–Redfern model and Broido's models were utilized to measure the activation energy of thermal decomposition by assuming first‐order kinetics. The results of both methods have displayed a high level of agreement. Our study extended to study the MFI of the sPS/Al 2 O 3 nanocomposites. The MFI reduced when the Al 2 O 3 nanoparticles content increased. The effect of gamma irradiation on the thermal behavior of the sPS/Al 2 O 3 nanoparticles was also investigated at different gamma‐absorbed doses. Significant modifications were observed in the thermal behavior of sPS/Al 2 O 3 nanocomposites after the irradiation process, and the experimental data indicated that the addition of Al 2 O 3 nanocomposites in small loading contents and gamma irradiation can significantly help improve the thermal properties of sPS. POLYM. COMPOS., 40:3588–3600, 2019. © 2019 Society of Plastics Engineers