Exfoliated Nylon 66/organoclay (PA66/OMT) nanocomposites were synthesized based on adipic acid, hexamethylendiamine, and organoclay (organically modified montmorillonite, OMT) modified by protonated aminocaproic acid via in situ polymerization. X-ray diffraction and transmission electronic microscopy were used to characterize their morphologies. Results confirmed that the exfoliated nanocomposites with different organoclay content were obtained. The crystallization behavior, thermal stability, and flame retardant properties of the PA66/OMT nanocomposites were investigated through thermogravimetry, differential scanning calorimetry and cone calorimetry experiments. The addition of OMT can induce the generation of γ-crystalline phase, increase the crystallization temperature and affect the crystallinity in PA66 matrix. The exfoliated nanocomposites have enhanced thermal stability and flame retardant properties compared with pure PA66. And it shows that a synergistic effect occurred between nanoscale clay layers and flame-retardant melamine polyphosphate.
Okada, A. and Usuki, A. (2006). Twenty Years of Polymer-clay Nanocomposites, Macromol . Mater. Eng., 291: 1449-1476.
2.
Utracki, L.A. , Sepehr, M. and Boccaleri, E. (2007). Synthetic, Layered Nanoparticles for Polymeric Nanocomposites WNCO, Polym. Adv. Technol., 18: 1-37.
3.
Wang, S.F., Hu, Y., Song, L., Wang, Z.Z., Chen, Z.Y. and Fan, W.C. (2002). Preparation and Thermal Properties of ABS/Montmorillonite Nanocomposite, Polym. Degrad. Stab., 77: 423-426.
4.
Morgan, A.B. and Gilman, J.W. (2003). Characterization of Polymer-Layered Silicate (Clay) Nanocomposites by Transmission Electron Microscopy and X-Ray Diffraction: A Comparative Study, J. App. Polym. Sci., 87: 1329-1338.
5.
Xie, W., Gao, Z.M., Pan, W.P., Hunter, D., Singh, A. and Vaia, R. (2001). Thermal Degradation Chemistry of Alkyl Quaternary Ammonium Montmorillonite, Chem. Mater., 13: 2979-2990.
6.
Bourbigot, S. , Le Bras , M., Dabrowski, F., Gilman, J.W. and Kashiwagi , T. (2000). PA-6 Clay Nanocomposite Hybrid as Char Forming Agent in Intumescent Formulations , Fire Mater., 24: 201-208.
7.
Song, L., Hu, Y., Tang, Y., Zhang, R., Chen, Z.Y. and Fan, W.C. (2005). Study on the Properties of Flame Retardant Polyurethane/Organoclay Nanocomposite, Polym. Degrad. Stab., 87: 111-116.
8.
Gilman, J.W. , Jackson, C.L., Morgan, A.B., Harris, R., Manias, E., Giannelis, E.P., Wuthenow, M., Hilton, D. and Phillips, S.H. (2000). Flammability Properties of Polymer - Layered-silicate Nanocomposites. Polypropylene and Polystyrene Nanocomposites, Chem. Mater., 12: 1866-1873.
9.
Zanetti, M., Camino, G., Canavese, D., Morgan, A.B., Lamelas, F.J. and Wilkie, C.A. (2002). Fire Retardant Halogen-antimony-clay Synergism in Polypropylene Layered Silicate Nanocomposites, Chem. Mater. , 14: 189-193.
Liu, X.H. and Wu, Q.J. (2002). Polyamide 66/clay Nanocomposites via Melt Intercalation, Macromol. Mater. Eng., 287: 180-186.
12.
Han, B., Ji, G.D., Wu, S.S. and Shen, J. (2003). Preparation and Characterization of Nylon 66/Montmorillonite Nanocomposites with Co-treated Montmorillonites, Eur. Polym. J., 39: 1641-1646.
13.
Lu, Y.L., Zhang, G.B., Feng, M., Zhang, Y., Yang, M. and Shen, D. (2003). Hydrogen Bonding in Polyamide 66/Clay Nanocomposite , J. Polym. Sci. Part B: Polym. Phys., 41: 2313-2321.
14.
Liu, X.H. , Wu, Q.J. and Berglund, L. (2002). Polymorphism in Polyamide 66/Clay Nanocomposites, Polymer, 43: 4967-4972.
15.
Liu, X.H. , Wu, Q.J., Zhang, Q.X. and Mo, Z.S. (2003). Phase Transition in Polyamide-66/Montmorillonite Nanocomposites on Annealing, J. Polym. Sci. Part B: Polym. Phys., 41: 63-67.
16.
Zhang, Q.X., Yu, Z.Z., Yang, M.S., Ma, J. and Mai, Y.W. (2003). Multiple Melting and Crystallization of Nylon-66/Montmorillonite Nanocomposites, J. Polym. Sci. Part B: Polym. Phys., 41: 2861-2869.
17.
Shen, L., Phang, I.Y., Chen, L., Liu, T.X. and Zeng, K.Y. (2004). Nanoindentation and Morphological Studies on Nylon 66 Nanocomposites. I. Effect of Clay Loading, Polymer, 45: 3341-3349.
18.
Shen, L., Phang, I.Y., Liu, T.X. and Zeng, K.Y. (2004). Nanoindentation and Morphological Studies on Nylon 66/Organoclay Nanocomposites. II. Effect of Strain Rate, Polymer , 45: 8221-8229.
19.
Lu, Y.L. , Zhang, Y., Zhang, G.B., Yang, M.S., Yan, S.K. and Shen, D.Y. (2004). Influence of Thermal Processing on the Perfection of Crystals in Polyamide 66 and Polyamide 66/Clay Nanocomposites, Polymer, 45: 8999-9009.
20.
Kang, X., He, S.Q., Zhu, C.S., Lu, L.W.L. and Guo, J.G. (2005). Studies on Crystallization Behaviors and Crystal Morphology of Polyamide 66/Clay Nanocomposites, J. Appl. Polym. Sci.95: 756-763.
21.
Hedicke, K. , Wittich, H., Mehler, C., Gruber, F. and Altstadt, V. (2006). Crystallisation Behaviour of Polyamide-6 and Polyamide-66 Nanocomposites, Composites Science and Technology, 66: 571-575.
22.
Qin, H.L. , Su, Q.S., Zhang, S.M., Zhao, B. and Yang, M.S. (2003). Thermal Stability and Flammability of Polyamide 66/Montmorillonite Nanocomposltes, Polymer, 44: 7533-7538.
23.
Phang, I.Y. , Chen, L., Tjiu, W.C., Pisharath, S. and Liu, T.X. (2004). Nylon 66/Organoclay NanocompositesI. Preparation, Morphology, Thermal and Mechanical Properties, Materials Research Innovations, 8: 159-160.
24.
Yu, Z.Z. , Yan, C., Yang, M.S. and Mai, Y.W. (2004). Mechanical and Dynamic Mechanical Properties of Nylon 66/Montmorillonite Nanocomposites Fabricated by Melt Compounding, Polymer, International, 53: 1093-1098.
25.
Vlasveld, D.P.N. , Vaidya, S.G., Bersee, H.E.N. and Picken, S.J. (2005). A Comparison of the Temperature Dependence of the Modulus, Yield Stress and Ductility of Nanocomposites Based on High and Low MW PA6 and PA66, Polymer, 46: 3452-3461.
26.
Gyoo, P.M., Venkataramani, S. and Kim, S.C. (2006). Morphology, Thermal, and Mechanical Properties of Polyamide 66/Clay Nanocomposites with Epoxy-modified Organoclay, J. Appl. Polym. Sci., 101: 1711-1722.
27.
Levchik, S.V. , Weil, E.D. and Lewin, M. (1999). Thermal Decomposition of Aliphatic Nylons, Polym. Int., 48: 532-557.
28.
Murthy, N.S., Curran, S.A., Aharoni, S.M. and Minor, H. (1991). Premelting Crystalline Relaxations and Phase-transitions in Nylon-6 and 6,6, Macromolecules, 24: 3215-3220.
