PRE-SWELLING PROCESS OF THE SURFACE MODIFIED MONTMORILLONITE (O-MMT) AS A STRATEGY TO ENHANCE EXFOLIATION AND DISPERSION
The production of exfoliated polymer/clay based nanocomposites is crucial to obtain an actual benefit of nanoscale reinforcement in the polymer matrix. The objective of this study was to employ the pre-swelling process through the combination of magnetic stirring and ultra-sonication technique to produce more readily exfoliated O-MMT for the production of polymer nanocomposite. The effects of dispersant concentration on the thermal stability, structure and morphology of the pre-swelled O-MMT were studied. Results indicated that the pre-swelling process did not reduce the thermal stability of the O-MMT, showing that this method did not leach out or degrade the surface modifier of the O-MMT. Among all the pre-swelled O-MMTs, the one prepared using H2O/O-MMT ratio of 1:1 had the best thermal stability. As proved through the XRD analysis, this sample possesses larger basal spacing as compared to the origin O-MMT. FESEM analyses suggested that disorientation and misalignment of platelets occurred, forming ‘house of card’ structure. More porous and loosely packed platelets were obtained, which is predicted can allow better O-MMT dispersion and polymer chains intercalation during the formation of exfoliated polymer nanocomposite. Furthermore, the H2O/O-MMT ratio of 1:1 was selected as the best dispersant concentration to form the pre-swelled O-MMT.
 A. F. Osman, A. M. Alakrach, H. Kalo, W.N.W. Azmi and F. Hashim, “In vitro biostability and biocompatibility of ethyl vinyl acetate (EVA) nanocomposites for biomedical applications”, RSC Advances, vol. 5, no. 40, pp. 31485-31495, 2015.
 M. Kotal and A. K. Bhowmick, “Polymer nanocomposites from modified clays: Recent advances and challenges”, Progress in Polymer Science, vol. 51, no. 2, pp. 127-187, 2015.
 S. Gul, A. Kausar, B. Muhammad and S. Jabeen, “Research progress on properties and applications of polymer/clay nanocomposite”, Polymer-Plastics Technology and Engineering, vol. 55, no. 7, pp. 684-703, 2016.
 S. L. Bee, M. A. A. Abdullah, S. T. Bee, L. T. Sin and A. R. Rahmat, “Polymer nanocomposites based on silylated-montmorillonite: A review”, Progress in Polymer Science, vol. 85, no. 6, pp. 57-82, 2018.
 N. Saba, M. Jawaid and M. Asim, Nanoclay Reinforced Polymer Composites. Singapore: Springer, 2016.
 K. Zdiri, A. Elamri and M. Hamdaoui, “Advances in thermal and mechanical behaviors of PP/clay nanocomposites,” Polymer-Plastics Technology and Engineering, vol. 56, no. 8, pp. 824-840, 2017.
 R. R. Tiwari, K. C. Khilar and U. Natarajan, “Synthesis and characterization of novel organo-montmorillonites”, Applied Clay Science, vol. 38, no. 3-4, 203-208, 2008.
 T. T. Zhu, C.H. Zhou, F. B. Kabwe, Q. Q. Wu, C. S. Li and J. R. Zhang, “Exfoliation of montmorillonite and related properties of clay/polymer nanocomposites”, Applied Clay Science, vol. 169, no. 6, pp. 48-66, 2019.
 B. K. G. Theng, Formation and Properties of clay-polymer complexes, 2nd edition. Amsterdam: Elsevier Science, 2012.
 N. A. M. Noor, J. A. Razak, S. Ismail, N. Mohamad, L. K. Tee, R. F. Munawar and R. Junid, “Review on carbon nanotube based polymer composites and its applications”, Journal of Advanced Manufacturing Technology, vol. 12, no. 1(1), pp. 311-326, 2018.
 A. R. Hamid, A. F. Osman, “Effects of Ultrasonication time on thermal stability and swelling behaviour of the commercial organo-Montmorillonite (O-MMT)”, International Journal of Engineering & Technology, vol. 7, no. 23, pp. 288-291, 2018.
 E. Dunkerley and D. Schmidt, “Effects of composition, orientation and temperature on the O2 permeability of model polymer/clay nanocomposites,” Macromolecules, vol. 43, no. 24, pp. 10536-10544, 2010.
 K. S. Santos, E. Bischoff, S. A. Liberman, M. A. S. Oviedo and R. S. Mauler, “The effects of ultrasound on organoclay dispersion in the PP matrix”, Ultrasonics Sonochemistry, vol. 18, no. 5, pp. 997-1001, 2011.
 Y. Xi, R. L. Forst, H. He, T. Kloprogge and T. Bossom, “Modification of montmorillonite surfaces using a cationic surfactant”, Langmuir, vol. 21, no.19, pp. 8675-8680, 2005.
 M. A. Cárdenas, D. García‐López, J. F. Fernández, I. Gobernado‐Mitre, J. C. Merino, J. M. Pastor and D. Calveras, “EVA nanocomposites elaborated with bentonite organo‐modified by wet and semi‐wet methods,” Macromolecular Materials and Engineering, vol. 292, no. 9, pp. 1035-1046, 2007.
 S. Boudjemaa and B. Djellouli, “Characterization of organo montmorillonite (organo-MMT) and study of its effects upon the formation of poly (methyl methacrylate)/organo-MMT nanocomposites prepared by in situ solution polymerization, “Russian Journal of Applied Chemistry, vol. 87, no. 10, pp. 1464-1473, 2014.
 A. Kaboorani, B. Riedl and P. Blanchet, “Ultrasonication technique: a method for dispersing nanoclay in wood adhesives,” Journal of Nanomaterials, vol. 2013, pp. 1-9, 2013.
 K. Dean, J. Krstina, W. Tian and R. J. Varley, “Effect of ultrasonic dispersion methods on thermal and mechanical properties of organoclay epoxy nanocomposites,” Macromolecular Materials and Engineering, vol. 292, no. 4, pp. 415-427, 2007.
 A. A. Mirghasemi and H. Bayesteh, “Numerical simulation of tortuosity effect on the montmorillonite permeability”, Procedia Engineering, vol. 102, pp. 1466-1475, 2015.
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