Electromagnetic Shielding Effectiveness of Wollastonite/PANI/Colemanite Composites

Year 2021, Issue: 21, 83 - 89, 31.01.2021

Ethem İlhan Şahin , Mehriban Emek

https://doi.org/10.31590/ejosat.816145

Cited By: 3

Abstract

In this study, composites of wollastonite-colemanite were produced by using mixed oxide technique. The wollastonite-colemanite compositions were formed with various proportions for the structural analysis. The results of wollastonite-colemanite structural analysis indicated that second phase did not form in wollastonite and colemanite. The single phases wollastanite-colemanite compounds were measured after sintering between 900-1100°C for X-ray diffraction (XRD). Addionality, the wollastonite/polyaniline/colemanite composites were produced by hot pressing using the compositions of wollastonite-colemanite in different proportions and aniline. The weight ratios of (wollastonite-colemanite) and aniline were 1:1 respectively and epoxy resin was used to produce microwave shielding effectiveness composites. The microwave shielding performances of wollastonite/polyaniline/colemanite composites were investigated by shielding effect in 0 –8 GHz, using two–port vector network analyzer (VNA). A minimum of – 41.65 dB shielding effectiveness performance was obtained in 6.26 GHz at the thickness of 1.5 mm. According to the parameters determined in terms of properties, the wollastonite-colemanite compounds were produced as composite with a PANI base and their features were characterized for shielding effect. This microwave shielding performance can be modulated simply by controlling the content of polyaniline and content of wollastonite-colemanite in the samples for the wider and required frequency bands.

Keywords

Electromagnetic shielding effectiveness, Polyaniline, Wollastonite, Colemanite, Polymer-matrix composites

Supporting Institution

İstanbul Teknik Üniversitesi ,Marmara Üniversitesi

Thanks

This research was funded by Marmara University and Istanbul Technical University. This work is attributed to Salim Sahin who died in 2014, and to Prof. Dr. Ayhan Mergen who died in 2017. The writers thank them and Hayrettin Simsek (Marmara University) for their friendship, advice and support

Wollastanit/PANI/Kolemanit Kompozitlerin Elektromanyetik Kalkanlama Etkinliği

Abstract

Bu çalışmada, wollastanit-kolemanit kompozitleri oksitlerin karışımı tekniği kullanılarak üretilmiştir. Wollastanit-kolemanit bileşimleri, yapısal analiz için çeşitli oranlarda oluşturulmuştur. Wollastonit-kolemanit yapısal analiz sonuçları, wollastanit ve kolemanit'te ikinci fazın oluşmadığını göstermiştir. Tek fazlı wollastanite-kolemanit bileşikleri, X-ışını kırınımı (XRD) için 900-1100°C arasında sinterlendikten sonra ölçüldü. Ayrıca wollastanit /polianilin/ kolemanit kompozitleri, farklı oranlarda wollastanit-kolemanit ve anilin bileşimleri kullanılarak sıcak presleme ile üretilmiştir. (Wollastonite-Kolemanit) ve anilinin ağırlık oranları sırasıyla 1:1 idi ve epoksi reçinesi mikrodalga kalkanlama etkili kompozitleri üretmek için kullanıldı. Wollastanit/ polianilin / kolemanit kompozitlerinin mikrodalga kalkanlama performansları, iki portlu vektör network analizörü (VNA) kullanılarak 0–8 GHz' de ekranlama etkisi ile incelenmiştir. 1.5 mm kalınlıkta 6.26 GHz'de minimum - 41.65 dB ekranlama etkinliği performansı elde edildi. Özellikler açısından belirlenen parametrelere göre wollastanit-kolemanit bileşikleri PANI bazlı kompozit olarak üretilmiş ve özellikleri kalkanlama etkisi için karakterize edilmiştir. Bu mikrodalga kalkanlama performansı, daha geniş ve gerekli frekans bantları için numunelerdeki polianilin içeriği ve wollastanit-kolemanit içeriği kontrol edilerek kolay bir şekilde modüle edilebilir.

Keywords

Electromagnetic shielding effectiveness, Polyaniline, Wollastonite, Colemanite, Polymer-matrix composites., Polymer, Microwave, VNA, microwave shielding performance

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