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

Poli(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.

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 Kissinger 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.

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