Effects of solution mixing temperature on dielectric properties of PMMA/Pristine bentonite nanocomposites

Kaya, A. Uğur; Güner, Selahaddin; Esmer, Kadir

doi:10.1002/app.39907

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…In the advancement of materials science and technology, the polymer–clay nanocomposites (PCNs) have emerged as a new class of materials for the academic, industrial, and technological interest . Most of the studies have documented that the formation of the intercalated and exfoliated clay structures in the polymer matrix have resulted in the improvement of the thermal (increased heat resistance and reduced flammability) and mechanical properties of the host polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of hydrophilic polymer blends/montmorillonite clay nanocomposites

Sengwa

Choudhary

2014

J of Applied Polymer Sci

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The nanocomposite films comprising polymer blends of poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), poly(ethylene oxide) (PEO), and poly(ethylene glycol) (PEG) with montmorillonite (MMT) clay as nanofiller were prepared by aqueous solution casting method. The X‐ray diffraction studies of the PVA–x wt % MMT, (PVA–PVP)–x wt % MMT, (PVA–PEO)–x wt % MMT and (PVA–PEG)–x wt % MMT nanocomposites containing MMT concentrations x = 1, 2, 3, 5 and 10 wt % of the polymer weight were carried out in the angular range (2θ) of 3.8–30°. The values of MMT basal spacing d001, expansion of clay gallery width Wcg, d‐spacing of polymer spherulite, crystallite size L and diffraction peak intensity I were determined for these nanocomposites. The values of structural parameters reveal that the linear chain PEO and PEG in the PVA blend based nanocomposites promote the amount of MMT intercalated structures, and these structures are found relatively higher for the (PVA–PEO)–x wt % MMT nanocomposites. It is observed that the presence of bulky ester‐side group in PVP backbone restricts its intercalation, whereas the adsorption behavior of PVP on the MMT nanosheets mainly results the MMT exfoliated structures in the (PVA–PVP)–x wt % MMT nanocomposites. The crystallinities of the PEO and PEG were found low due to their blending with PVA, which further decreased anomalously with the increase of MMT concentration in the nanocomposites. The decrease of polymer crystalline phase of these materials confirmed their suitability in preparation of novel solid polymer nanocomposite electrolytes. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40617.

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Section: Introductionmentioning

confidence: 99%

Structural characterization of hydrophilic polymer blends/montmorillonite clay nanocomposites

Sengwa

Choudhary

2014

J of Applied Polymer Sci

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“…Polimer-kil kompozitlerinin elektriksel ve dielektrik özellikleri hem polimer esaslı hem de kil esaslı nanokompozitlerde araştırılmıştır [7][8][9][10].…”

Section: Giriş (Introduction)unclassified

PVA/Na-Bentonite kompozitlerin yapısal ve dielektrik özelliklerinin incelenmesi

Akar,

Kaya

2024

GUMMFD

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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.

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Structural and dielectric studies of amorphous and semicrystalline polymers blend‐based nanocomposite electrolytes

Choudhary

Sengwa

2014

J of Applied Polymer Sci

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The solid polymeric nanocomposite electrolyte (SPNE) films based on the blend of amorphous poly(methyl methacrylate) (PMMA) and semicrystalline poly(ethylene oxide) (PEO) (PMMA:PEO 5 80:20 wt %) doped with lithium perchlorate (LiClO 4 ) salt and montmorillonite (MMT) clay nanofiller were prepared by classical solution cast, ultrasonic assisted solution cast and ultrasonication along with microwave irradiated solution cast followed by melt-pressing methods. The X-ray diffraction study of these electrolytes revealed the amorphous behavior with intercalated MMT structures. The suppressed crystallinity of PEO in the blend electrolyte complexes confirmed the existence of single discrete PEO chains confined within the PMMA domains. The dielectric relaxation spectroscopy of these materials was performed over the frequency range 20 Hz to 1 MHz, at ambient temperature. The presence of a singular relaxation peak in the loss tangent and electric modulus spectra of these electrolytes confirms a coupled cooperative chain segmental dynamics of the blend polymer owing to their miscible amorphous morphology. The behavior of transient complexes formed between the polymers functional groups, lithium cations and the intercalated MMT nanoplatelets was explored. The ambient temperature ionic conductivity of these electrolytes depends on the structural dynamics and the sample preparation methods. It is revealed that the presence of PEO in the PMMA matrix mainly governs the structural, dielectric, and ionic properties of these SPNE films.

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Effects of solution mixing temperature on dielectric properties of PMMA/Pristine bentonite nanocomposites

Cited by 9 publications

References 38 publications

Structural characterization of hydrophilic polymer blends/montmorillonite clay nanocomposites

Structural characterization of hydrophilic polymer blends/montmorillonite clay nanocomposites

PVA/Na-Bentonite kompozitlerin yapısal ve dielektrik özelliklerinin incelenmesi

Structural and dielectric studies of amorphous and semicrystalline polymers blend‐based nanocomposite electrolytes

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