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  • Küçük Resim
    Öğe
    Improvement of thermal stability and gamma-rayabsorption in microwave absorbable poly(methylmethacrylate)/graphene nanoplatelets nanocomposite
    (Journal of Applied Polymer Science, 2021) Gül, Furkan Berke; Bel, Tayfun; Muhammettursun, Mahmut; Kocacinar, Elif; Erman, Ecem; Doğan, Emre; Celep, Murat; Baydoğan, Nilgün
    The graphene nanofiller (2 wt%) was dispersed in poly(methyl methacrylate) byin situ polymerization method. The optimum high frequency (microwave)absorption was evaluated at X-band due to changes in the scattering parameters(determined by using a vector network analyzer). The slight improvement hasbeen attained in gamma attenuation coefficient of the polymer nanocompositeby using gamma transmission technique. The addition of graphene nanoplatelets(2 wt%) resulted in a thermal improvement from 196.73 to 243.00 C (with 5%weight loss) in TGA analysis. The graphene nanoplatelets provided an optimumdecrease in scattering of the microwaves due to the elimination of the defectsand the prevention of the agglomeration of the graphene nanoplates. Theimprovement of microwave absorption (between 8 and 12 GHz) suggested thatthe nanocomposite was a suitable candidate as a microwave absorbing material.This multipurpose nanocomposite has provided thermal stability and it hasensured the optimum gamma-ray and microwave absorption depending on thedevelopment of the structural properties. The development of these physicalcharacteristics has enabled to improve the electrical conductivity as a result ofthe progress in the structural properties.
  • Küçük Resim
    Öğe
    Strengthened bonds by chemical development at surface of low dielectric PMMA/Borax composite for low reflection of broadband waves (500 MHz—50 GHz)
    (Journal of Polymer Research, 2023) Gül, Furkan Berke; Celep, Murat; Baydoğan, Nilgün
    PMMA (polymethylmethacrylate) and borax doped copolymer were synthesized by using atom transfer radical polymerization method. The uses of this copolymer were evaluated to spread it and to a wider area of use or to place it in specialized use in certain areas for the application fields of this copolymer. The results of the XPS analysis presented the bonds formed between C, O, B, and Cu and the types of bonds (single, double, or triple bond) based on the binding energies of the atoms. PMMA/Borax composite has presented that there was a relation between the chemical features of surface bonding and the modification of the dielectric properties with smaller values with the change of the borax amount. The behaviour of low reflection of broadband waves (500 MHz—50 GHz) interacting with the composite was influenced by several factors (including the modification of the composite's composition by borax at the optimum amount). The low reflection of broadband waves (500 MHz—50 GHz) was modified by the strengthened bonds as the result of the chemical development at the surface structure. The transmittance of the X-band microwave signal has been performed through the material for the use of the radome application. The passing of the signal to the other side of the material was provided by the maximum attenuation of 2.74 dB for use in the potential radome applications.