Thermal and Mechanical Properties of Modified CaCO3 /PP Nanocomposites

Authors: A. Buasri, N. Chaiyut, K. Borvornchettanuwat, N. Chantanachai, K. Thonglor

Abstract:

Inorganic nanoparticles filled polymer composites have extended their multiple functionalities to various applications, including mechanical reinforcement, gas barrier, dimensional stability, heat distortion temperature, flame-retardant, and thermal conductivity. Sodium stearate-modified calcium carbonate (CaCO3) nanoparticles were prepared using surface modification method. The results showed that sodium stearate attached to the surface of CaCO3 nanoparticles with the chemical bond. The effect of modified CaCO3 nanoparticles on thermal properties of polypropylene (PP) was studied by means of differential scanning calorimetry (DSC) and Thermogravimetric analysis (TGA). It was found that CaCO3 significantly affected the crystallization temperature and crystallization degree of PP. Effect of the modified CaCO3 content on mechanical properties of PP/CaCO3 nanocomposites was also studied. The results showed that the modified CaCO3 can effectively improve the mechanical properties of PP. In comparison with PP, the impact strength of PP/CaCO3 nanocomposites increased by about 65% and the hardness increased by about 5%.

Keywords: Polypropylene Nanocomposites, Modified Calcium Carbonate, Sodium Stearate, Surface Treatment

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1333084

References:

[1] Y. Lin, H. Chen, C.M. Chan, J. Wu, "Nucleating effect of calcium stearate coated CaCO3 nanoparticles on polypropylene," J. Colloid Interface Sci., 354 (2), pp. 570-576, 2011.
[2] S. Karamipour, H. Ebadi-Dehaghani, D. Ashouri, S. Mousavian, "Effect of nano-CaCO3 on rheological and dynamic mechanical properties of polypropylene: Experiments and models," Polym. Test., 30, pp. 110- 117, 2011.
[3] A. Kiss, E. Fekete, B. Pukánszky, "Aggregation of CaCO3 particles in polypropylene composites: Effect of surface coating," Compos. Sci. Technol., 67, pp. 1574-1583, 2007.
[4] R.G. Raj, B.V. Kokta, F. Dembele, B. Sanschagrin, "Compounding of cellulose fibres with polypropylene: Effect of fibre treatment on dispersion in the polymer matrix," J. Appl. Polym. Sci., 38 (11), pp. 1987-1996, 1989.
[5] P. Mareri, S. Bastide, N. Binda, A. Crespy, "Mechanical behaviour of polypropylene composites containing fine mineral filler: Effect of filler surface treatment," Compos. Sci. Technol., 58, pp. 747-752, 1998.
[6] J.Z. Liang, "Evaluation of dispersion of nano-CaCO"3 particles in polypropylene matrix based on fractal method," Compos. Part A: Appl. Sci. Manuf., 38 (6), pp. 1502-1506, 2007.
[7] B. Shentu, J. Li, Z. Weng, "Effect of oleic acid-modified nano-CaCO3 on the crystallization behavior and mechanical properties of polypropylene," Chinese J. Chem. Eng., 14, pp. 814-818, 2006.
[8] Z. Zhang, C. Wang, Y. Meng, K. Mai, "Synergistic effects of toughening of nano-CaCO3 and toughness of β-polypropylene," Compos. Part A: Appl. Sci. Manuf., 43 (1), 189-197, 2012.
[9] L. Han, X. Li, Y. Li, T. Huang, Y. Wang, J. Wu, F. Xiang, "Influence of annealing on microstructure and physical properties of isotactic polypropylene/calcium carbonate composites with β-phase nucleating agent," Mater. Sci. Eng. A, 527, pp. 3176-3185, 2010.
[10] S.S. Saghi, S.M. Zebarjad, J.V. Khaki, S.A. Sajjadi, "The effect of nano-sized calcium carbonate on thermodynamic parameters of HDPE," J. Mater. Process. Technol., 209, pp. 1310-1317, 2009.
[11] S.M. Zebarjad, M. Tahani, S.A. Sajjadi, "Influence of filler particles on deformation and fracture mechanism of isotactic polypropylene," J. Mater. Process. Technol., 155-156, pp. 1459-1464, 2004.
[12] C.M. Chan, J. Wu, J.X. Li, Y.K. Cheung, "Polypropylene/calcium carbonate nanocomposites," Polymer, 43, pp. 2981-2992, 2002.