Yazar "Muhammettursun, Mahmut" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • 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
    Investigation of the elastic properties of poly (methylmethacrylate) reinforced with graphene nanoplatelets
    (Journal of Applied Polymer Science, 2021) Gül, Furkan Berke; Muhammettursun, Mahmut; Kocacinar, Elif; Erman, Ecem; Augousti, Andy; Baydoğan, Nilgün; Bel, Tayfun
    The technique for synthesis of poly (methyl methacrylate) (PMMA) by atomtransfer radical polymerization has been strengthened by using graphenenanoplatelets (GNPs) to enhance the elastic properties of the polymer. In orderto improve practical, economical and mechanical performance, the requirementsfor effective implementation of production control as a smart bulk polymernanocomposite were determined for cost-effective bulk production. Three-dimensional inspection (using an ultrasound interrogation method for the wholevolume under test) confirmed the synthesis of the nanocomposite to be free ofagglomeration and bubbles. As a result of this elimination of defects, anenhancement in compressive strengthof 42.7% was achieved and the Rock-well hardness was increased by 19.9% through the addition of GNPs at 2 wt%by mass. The deformation and mechanical failure properties have been char-acterized in the mechanical enhancement of the polymer nanocomposite.Elastic parameters determined using ultrasound testing identified thatchanges in the structural features following the addition of these GNPs wereuniquely connected to the enhancements in these elastic parameters (such asYoung's modulus, Poisson's ratio, shear modulus, and microhardness) of thePMMA/GNPs nanocomposite.