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SANCAK, ERHAN

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SANCAK

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ERHAN

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2013 - 20183
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  • Thumbnail Image
    PublicationOpen Access
    Analyses of the mechanical, electrical and electromagnetic shielding properties of thermoplastic composites doped with conductive nanofillers
    (SAGE PUBLICATIONS LTD, 2018-05) SANCAK, ERHAN; Yilmaz, Ali Can; Ozen, Mustafa Sabri; Sancak, Erhan; Erdem, Ramazan; Erdem, Ozlem; Soin, Navneet
    The purpose of this study is to observe effect of incorporating vapor-grown carbon nanofibers with various amounts in polyvinylidene fluoride matrix in terms of mechanical strength and electromagnetic shielding effectiveness. Thermoplastic conductive nanocomposites were prepared by heat-pressed compression molding. Vapor-grown carbon nanofibers were utilized at various weight ratios (1wt.%, 3wt.%, 5wt.%, and 8wt.%) as conductive and reinforcing materials. Polyvinylidene fluoride was used as a thermoplastic polymer matrix. Scanning electron microscopic analysis was conducted in order to characterize the morphology and structural properties of the nanocomposites and results revealed well dispersion of carbon nanofibers within the matrix for all concentrations. Mechanical characteristics were investigated according to standards. Findings proved that overall increments of 16%, 37.5%, and 56% were achieved in terms of tensile strength, elasticity modulus, and impact energy, respectively, where a total reduction of 44.8% was observed in terms of elongation for 8wt.% vapor-grown nanofiber matrix compared to that of 0wt.%. Electromagnetic shielding effectivenesses of the nanocomposites were determined by standard protocol using coaxial transmission line measurement technique in the frequency range of 15-3000 MHz. It was observed that resistance, sheet resistance, and resistivity of nanocomposites depicted substantial reduction with the increment in nanofiber content. Nevertheless, it was observed that nanofiber content, dispersion, and network formation within the composites were highly influent on the electromagnetic shielding effectiveness performance of the structures.
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    PublicationOpen Access
    Unprecedented Electromagnetic Shielding Effectiveness of Lightweight Nonwoven Ag/PA66 Fabrics
    (KOREAN FIBER SOC, 2018-02) SANCAK, ERHAN; Ozen, M. S.; Sancak, E.; Soin, N.; Shah, T. H.; Zarei, A.; Siores, E.
    Novel, high-performance silver coated polyamide, Ag/PA66, nonwoven fabrics with a density of only 0.04 g/cm(3) have been developed using staple fibres of 19 (3.3 dtex) and 27 (6.7 dtex) mu m diameter. The obtained nonwoven fabrics with an Ag loading of 12-18 wt% exhibited excellent weight-normalised specific electromagnetic shielding effectiveness of over 1200 dB/(g/cm(3)) in the 0.015-3 GHz range, which is among the highest reported till date. Moreover, the applied microwave was verified to be absorbed rather than being reflected back making the fabrics highly suitable for shielding applications. It was also observed that nonwoven fabrics made from finer 3.3 dtex Ag/PA66 fibres have higher reflection and lower absorption values than their thicker (6.7 dtex) counterparts. Additionally, we have also explored the use of these nonwoven Ag/PA66 fabrics for personal thermal management via Joule heating with samples showing rapid heating response (up to 0.2 degrees C/sec) and long-term stability measured over 10,000 seconds. The needle-punched Ag/PA66 nonwoven fabrics, in spite of their low density of the order of 0.04 g/cm(2), exhibited high EMSE values of nearly 69-80 dB, leading to excellent weight-normalised specific electromagnetic shielding effectiveness of over 1200 dB/(g/cm(3)) in the 0.015-3 GHz range. The production of Ag/PA66 needle punched nonwoven fabrics thus offers a facile route to develop multifunctional fabrics for EMI shielding as well as personal thermal management applications.
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    PublicationOpen Access
    Thermal and Mechanical Properties of Walnut Shell and Glass Fiber Reinforced Thermoset Polyester Composites
    (ASIAN JOURNAL OF CHEMISTRY, 2013) BEYİT, ALİ; Onat, Ayhan; Pazarlioglu, S. Serdar; Sancak, Erhan; Ersoy, Sezgin; Beyit, Ali; Erdem, Ramazan
    Recent studies have shown that focusing on industrial waste materials will enable us to recover the economical. values. In line with the objective of present study, walnut shell is a waste material was selected to ensure economic recovery. Furthermore, biaxial fiber glass based fabrics were used in order to improve the mechanical properties of the composite materials to be produced. Thermosetting polyester resin was used as matrix material in producing composite materials. Nine different composite materials were produced as a result of addition of walnut shells at different sizes and ratios. Mechanical tests and thermal conductivity tests of these composite materials were carried out and the results were assessed.