Investigation of structural and dielectric properties of PVA/Na-Bentonite composites

Yıl 2025, Cilt: 40 Sayı: 1, 287 - 296, 16.08.2024

Yeşim Akar , Ahmet Uğur Kaya

https://doi.org/10.17341/gazimmfd.1401676

Öz

In this study, polyvinyl alcohol (PVA)/Na-Bentonite composites were prepared. In the preparation of composites, a maximum of 13% polymer by mass was loaded into the clay. Structural properties of composites prepared by solution mixing technique were examined using X-ray fluorescence spectrometry (XRF), Fourier Transform infrared spectrometry (FTIR) and X-ray diffraction (XRD) techniques. Dielectric properties were determined with the help of Dielectric spectroscopy (DS). From the XRF study, it was understood that the origin of the clay was Calcium bentonite (Ca-Bentonite) provided from the Asbro-horio reservoir on the island of Milos, Greece, and that the Supplier (Imerys-Türkiye) converted the clay into Na-Bentonite through the sodium enrichment process. From XRD and FTIR measurements, it was observed that PVA interacted with the Na-bentonite surface instead of being located between the Na-bentonite galleries. This interaction between polymer and clay limited both the segmental movement of the polymer chains and the orientation of the hydroxyl groups on the clay surface. The electrode polarization effect is significantly reduced in composites with low PVA content.

Anahtar Kelimeler

Na-Bentonite, PVA, XRD, FTIR, dielectric

PVA/Na-Bentonite kompozitlerin yapısal ve dielektrik özelliklerinin incelenmesi

Öz

Bu çalışmada Polivinilalkol (PVA)/Na-Bentonit kompozitleri hazırlanmıştır. Kompozitlerin hazırlanmasında kilin içerisine kütlece maksimum %13 oranında polimer yüklenmiştir. Çözelti karıştırma tekniği ile hazırlanan kompozitlerin yapısal özellikleri X-ışını floresans spektrometresi (XRF), Fourier Dönüşümlü kızılötesi spektrometresi (FTIR) ve X-ışını kırınımı (XRD) teknikleri kullanılarak incelenmiştir. Dielektrik özellikler Dielektrik spektroskopi (DS) yardımıyla belirlendi. XRF çalışmasından, kil orijininin Yunanistan'ın milos adasında Asbro-Horio rezervuarından sağlanan Kalsiyum bentonit (Ca-Bentonite) olduğu ve Tedarikçi (Imerys-Türkiye) tarafından kili sodyum zenginleştirme işlemi ile Na-Bentonite dönüştürdüğü anlaşılmıştır. XRD ve FTIR ölçümlerinden PVA'nın Na-bentonit galerileri arasında yer almak yerine Na-Bentonit yüzeyi ile etkileşime girdiği gözlenmiştir. Polimer ve kil arasındaki bu etkileşim, hem polimer zincirlerinin segmental hareketini hem de kil yüzeyindeki hidroksil gruplarının yönelimini sınırlamıştır. Düşük frekans bölgesinde, kompozitlerin dielektrik sabiti (reel kısım) özellikle düşük PVA katkı oranlarında Na-Bentonite göre önemli ölçüde azalmıştır. Elektrot polarizasyon etkisi düşük katkılı kompozitlerde oldukça azalmıştır.

Anahtar Kelimeler

Na-Bentonit, PVA, XRD, FTIR, dielektrik

Kaynakça

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