Monomer Arakatkısı Yöntemi İle Poli metakrilamid /Kil Nanokompozitlerinin Sentezi ve Isıl Bozunma Kinetiği

P oli metakrilamid -montmorillonit PMAA/Mont nanokompozitlerinin sentezi için yeni bir yöntem başarıyla bu çalışmada uygulanmıştır. Öncelikle metakrilamid MAA monomeri, kil mineralinin tabakaları arasına iyon değişim tepkimesi ile yerleştirilmiştir. Montmorillonitin ara tabakalarına yerleştirilen monomer FTIR, XRD ve TGA yöntemleri ile karakterize edilmiştir. Daha sonra, farklı yüzdelerde kil içeren nanokompozitlerin hazırlanması amacıyla monomer montmorillonitin tabakaları arasında polimerleştirilmiştir. Nanokompozitlerin morfolojik ve ısıl özelliklerinin büyük oranda kil miktarına bağlı olduğu saptanmıştır. XRD ve SEM analizleri, nanokompozitlerin kil tabakalarının homojen dağılmasıyla oluşan intercalated morfolojisine sahip olduğunu göstermiştir. Bozunma aktivasyon enerjisinin hesaplanması amacıyla Kissinger yöntemi kullanılmıştır. PMAA/ Mont nanokompozitlerinin aktivasyon enerjilerinin katkısız PMAA’nın aktivasyon enerjisinden daha büyük olduğu görülmüştür. Bu sonuç, kil mineralinin eklenmesi ile katkısız polimerin ısıl kararlılığının arttığını göstermektedir

Anahtar Kelimeler:

Nanokompozitler, Poli Metakrilamid, kil, ısıl bozunma, Kissinger yöntemi

Synthesis and Thermal Degradation Kinetics of Poly methacrylamide /Clay Nanocomposites using Intercalated Monomer Method

Anovel method was used successfully for the synthesis of poly methacrylamide -montmorillonite PMAA/ Mont nanocomposites. Methacrylamide PMAA was first intercalated into the interlayer regions of clay minerals by ion exchange reaction. The intercalation of monomers into Mont was confirmed by FTIR, XRD and TGA techniques. Then, the monomers polymerized within the montmorillonite Mont layers for preparation of nanocomposites in different clay loading degrees. The morphology and thermal behaviors of nanocomposites were found to be strongly dependent on the clay content. XRD and SEM analysis indicated that the resultant nanocomposites exhibited intercalated morphologies with homogeneous clay platelet distribution. The Kissin- ger method was used for the calculation of the decomposition activation energy. Activation energies of PMAA/ Mont nanocomposite are higher than those of neat PMAA, indicating that addition of clay mineral improves thermal stability of neat polymer.

Keywords:

Nanocomposites, Poly methacrylamide, clay, thermal degradation, Kissinger method,

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PMAA (first stage) -12319 102 0.9795
PMAA (second stage) -20043 166 0.9729
PMAA/3% Mont (first stage) -16273 135 0.9557
PMAA/3% Mont (second stage) -20704 173 0.9833