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

Yıl 2016, Cilt: 44 Sayı: 4, 385 - 394, 01.11.2016

Esra Evrim Yalçınkaya

Öz

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.

Anahtar Kelimeler

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

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

Öz

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

Kaynakça

• P. Kiliaris, C.D. Papaspyrides, Polymer/layered silicate (clay) nanocomposites: An overview of flame retardancy, Progress Polymer Science. 35 (2010) 902-958.
• E.P. Giannelis, Polymer Layered Silicates Nanocomposites, Advances Materials. 8 (1996) 29-35.
• T.J. Pinnavaia, G.W. Beall, Polymer-Clay Nanocomposites, Wiley, Chichester, UK. (2000)
• E.E. Yalcinkaya, M. Balcan, C. Guler, Synthesis, characterization and dielectric properties of polynorbornadiene-clay nanocomposites by ROMP using intercalated Ruthenium catalyst, Material Chemistry and Physics. 143 (2013) 380-386.
• T.Lan, P. D. Kaviratna, T. J. Pinnavaia, On the nature of polyimide–clay hybrid composites, Chemistry Materials, 6 (1994) 573-575.
• S.S. Ray, M. Bousmina, Biodegradable polymers and their layered silicate nanocomposites: In greening the 21st century materials World, Progress Polymer Science, 50 (2005) 962-979.
• Q.T. Nguyen, D.G. Baird, Preparation of polymer-clay nanocomposites and their properties, Advances Polymer Technology, 25 (2006) 270-285.
• F. Hussaın, M. Hojjatı, M. Okamoto, R.E. Gorga, Polymer-matrix nanocomposites, processing, manufacturing, and application: an overview, Journal of Composites Materials, 40 (2006) 1511-1575.
• Y. Kawahara, M. Shioya, Mechanical properties of tussah silk fibers treated with methacrylamide, Journal of Applied Polymer Sience, 65 (1997) 2051- 2057.
• Q. Zhang, X. Li, Y. Zhao, L. Chen, Preparation and performance of nanocomposite hydrogels based on different clay, Applied Clay Science, 46 (2009) 346- 350.
• R. Anbarasan, P. Arvind, V. Dhanalakshmi, Synthesis and characterization of Polymethacrylamide–Clay nanocomposites, Journal of Applied Polymer Sience, 121 (2011) 563-573.
• T.A. Elbokl, C. Detellier, Kaolinite-poly(methacrylamide) intercalated nanocomposite via in situ polymerization, Canadıan Journal of Chemıstry-Revue Canadıenne De Chimie, 87 (2009) 272-279.
• J.L. Liang, J. P. Bell, D. A. Scola, Preparation and characterization of electropolymerized poly(N- substituted methacrylamide) matrices on graphite fibers, Journal of Applied Polymer Sience, 48 (1993) 477–494.
• H. Qui, F. Xu, L. Li, C. Xiang, Polyacrylamide/Zn 0.4 Ni 0.5 Cu 0.1 Fe 2 O 4 nanocomposites: synthesis, characterization and electromagnetic properties, Materials Chemistry and Physics, 124 (2010) 1039- 1045.
• E.E. Yalcinkaya, Polynorbornene/MMT nanocomposites via surface-initiated ROMP: synthesis, characterization, and dielectric and thermal Properties, Journal of Materials Science, 49 (2014) 749-757.
• E.E. Yalcinkaya, In situ synthesis of poly(N- vinylimidazole)/montmorillonite nanocomposites using intercalated monomer and thermal properties, Journal of Composite Materials, 50 (2016) 533-542.
• F.Demir, B. Demir, E.E. Yalçınkaya, S.Çevik, D.O. Demirkol, Ü.Anık, S.Timur, Amino Acid Intercalated Montmorillonite: Electrochemical Biosensing Applications, RSC Advances, 4 (2014) 50107-50113.
• M. Kotal, A.K. Bhowmick, Polymer nanocomposites from modified clays: Recent advances and challenges, Progress in Polymer Science, 51 (2015) 127–187.
• S.S. Ray, M.Okamoto, Polymer/Layered Silicate Nanocomposites: A Review from Preparation to Processing, Progress in Polymer Science, 28 (2003) 1539-1641.
• Y.F. Shih, L.S. Chen, R.J.Jeng, Preparation and properties of biodegradable PBS/multi-walled carbon nanotube nanocomposites, Polymer, 49 (2008) 4602–4611.
• M.Tian, C.D.Qu, Y.X. Feng,. Structure and properties of fibrillar silicate/SBR composites by direct blend process, Journal of Material Science, 38 (2003) 4917–4924.
• G.Chen, D.Shen, Z.Qi, Shear-induced ordered structure in polystyrene/clay nanocomposite, Journal of Material Research, 2 (2000) 351-356.
• J. Fan, S. Liu, G. Chen, Z. Qi, SEM Study of a Polystyrene/Clay Nanocomposite, Journal of Applied Polymer Science, 83 (2002) 66–69. R2
• 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