Dimensional stability is normally defined as the ability of a material to maintain its size and shape under various temperatures and stresses. The parameter, which is used to determine dimensional stability, is thermal expansion coefficient. This work deals with the study of the dimensional stability and thermal stability of high-density polyethylene (HDPE) and its nanocomposites by the presence of different stearic acid (SA) content as a modifier of surface. To investigate the role of surfactant on dimensional stability of HDPE nanocomposite reinforced with nano-sized calcium carbonate (CaCO3), nano-sized calcium carbonates were coated with different SA content. Standard specimens of HDPE/10 vol% CaCO3 nanocomposite were performed using injection method. To study dimensional stability of HDPE/10 vol% nanocomposites, dilatometry method was used. The results showed that addition of nano-sized CaCO 3 caused the decrease of thermal expansion coefficient of HDPE. In addition, dimensional stability of HDPE/10 vol% CaCO3 improved due to increasing SA content. Also, addition of inorganic fillers and surfactant retarded the thermal oxidation of HDPE.
Rusu, M., Sofien, N. and Rusu, D. ( 2001). Mechanical and Thermal Properties of Zinc Powder Filled High Density Polyethylene Composites, Polymer Testing, 20: 409-417.
2.
Yang, Y.L., Bai, S.L., G’sell, C. and Hiver, J.M. ( 2006). Mechanical Properties and Volume Dilatation of HDPE/CaCO3 Blends with and without Impact Modifier, Polymer Engineering and Science, 46: 1512-1522.
3.
Murty, M.V.S. , Grulke, E.A. and Bhattacharyya , D. (1998). Influence of Metallic Additives on Thermal Degradation and Liquefaction of High Density Polyethylene (HDPE), Polymer Degradation and Stability, 61: 421-430.
4.
Tanniru, M. and Misra, R.D.K. ( 2005). On Enhanced Impact Strength of Calcium Carbonate-reinforced High-density Polyethylene Composites, Materials Science & Engineering , A: Structural Materials: Properties, Microstructure and Processing, A405(1-2): 178-193.
5.
Osman, M.A. and Atallah, A. ( 2006). Effect of the Particle Size on the Viscoelastic Properties of Filled Polyethylene, Polymer, 47(7): 2357-2368.
6.
Tanniru, M., Misra, R.D.K., Berbrand, K. and Murphy, D. ( 2005). The Determining Role of Calcium Carbonate on Surface Deformation During Scratching of Calcium Carbonate-Reinforced Polyethylene Composites, Materials Science & Engineering, A: Structural Materials: Properties, Microstructure and Processing, A404(1-2): 208-220.
7.
Wunderlich, B. ( 1980). Macromolecular Physics, Academic Press , New York.
8.
Premphet, K. and Horanont, P. (1999). Influence of Stearic Acid Treatment of Filler Particles on the Structure and Properties of Ternary-phase Polypropylene Composites, Journal of Applied Polymer Science , 74: 3445-3454.
9.
Bartzak, Z., Argon, A.S., Cohen, R.E. and Kowaleski, T. ( 1999). Toughness Mechanism in Semi-Crystalline Polymer Blends: I. High-Density Polyethylene Toughened with Rubbers, Polymer , 40: 2331-2346.
10.
Pukánszky, B., Tudös, F., Jančař J. and Kolařik, J. (1989). The Possible Mechanisms of Polymer-Filler Interaction in Polypropylene-CaCO3 Composites, Material Science Letters, 8: 1040-1042.
11.
Lee, Y.C. and Porter, R.S. (1986). Crystallization of Poly(EtherEtherKetone) (PEEK) in Carbon Fiber Composites, Polymer Engineering and Science, 26: 633-639.
12.
Bartczak, Z. , Argon, A.S., Cohen, R.E. and Weinberg, M. (1999). Toughness Mechanism in Semi-Crystalline Polymer Blends: II. High-Density Polyethylene Toughened with Calcium Carbonate Filler Particles, Polymer, 40: 2347-2365.
13.
Lazzeri, A., Zebarjad, S.M., Pracella, M., Cavalier, K. and Rosa, R. ( 2005). Filler Toughening of Plastics. Part 1 - The Effect of Surface Interactions on Physico-Mechanical Properties and Rheological Behaviour of Ultrafine CaCO3/High Density Polyethylene Nanocomposites, Polymer, 46: 827-844.
14.
Kwon, S., Kim, K.J., Kim, H., Kundu, P.P., Kim, T.J., Lee, Y.K., Lee, B.H. and Choe, S. ( 2002). Tensile Property and Interfacial Dewetting in the Calcite Filled HDPE, LDPE, and LLDPE Composites, Polymer, 43: 6901-6909.
15.
Demjen, Z., Pukansky, B. and Nagy, J. ( 1998). Evaluation of Interfacial Interaction in Polypropylene Surface Treated CaCO3 Composites, Composites Part A - Applied Science and Manufacturing, 29: 323-329.
16.
Pukánszky, B. and Vörös , G. (1993). Mechanism of Interfacial Interracial Interactions in Particulate Filled Composites , Composite Interfaces, 1: 411-427.
17.
Tanaka, Y. and White, J.L. ( 1983). ). The Influence of Particle Size and Surface Coating of Calcium Carbonate on the Rheological Properties of its Suspensions in Molten Polystyrene, Journal of Applied Polymer Science, 28: 1481-1501.
18.
Kim, K.J. ( 1998). Rheology, Processing, and Characterization of Isotropic, Anisotropic, and Mixed Particle Filled Polymer System, Dissertation, University of Akron.
19.
Kim, K.J. , White, J.L., Choe, S.J. and Dehennau, C. (2004). Effects of Stearic Acid Coated Talc, CaCO3, and Mixed Talc/CaCO3 Particles on the Rheological Properties of Polypropylene Compounds, Journal of Applied Polymer Science , 93: 2105-2113.
20.
Wang, Y., Lu, J. and Wang, G. ( 1997). Toughening and Reinforcement of HDPE/CaCO3 Blends by Interfacial Modification Interfacial Interaction, Journal of Applied Polymer Science, 64: 1275-1281.
21.
Sahebian, S. , Zebarjad, S.M., Sajjadi, S.A., Sherafat, Z. and Lazzeri, A. (2007). Effect of Both Uncoated and Coated Calcium Carbonate on Fracture Toughness of HDPE/CaCO3 Nanocomposites , Journal of Applied Polymer Science, 104: 3688-3694.
22.
Zebarjad, S.M. and Sajjadi, S.A. (2008). On the Strain Rate of HDPE/CaCO3 Nanocomposites, Materials Science and Engineering A, 475: 365-367.
23.
Zebarjad, S.M. , Sajjadi, S.A., Tahani, M. and Lazzeri, A. (2006). A Study on Thermal Behavior of HDPE/CaCO3 Nanocomposites, In 12th International Scientific Conference on Achievements in Mechanical & Materials Engineering (AMME 2006), Silesian University of Technology of Gliwice , Gliwice, Poland, 4-8 June.
24.
Wang, Z.H., Wu, G., Hu, Y., Ding, Y., Hu, K. and Fan, W. ( 2002). Thermal Degradation of Magnesium Hydroxide and Red Phosphorus Flame Retarded Polyethylene Composites, Polymer Degradation and Stability, 77: 427-434.
25.
Yang, R., Liu, Y., Yu, J. and Wang, K. ( 2006). Thermal Oxidation Products and Kinetics of Polyethylene Composites, Polymer Degradation and Stability, 91: 1651-1657.
26.
Yuan, X., Li, C., Guan, G., Xiao, Y. and Zhang, D. ( 2008). Thermal Degradation Investigation of Poly(Ethylene Terephthalate)/Fibrous Silicate Nanocomposites, Polymer Degradation and Stability , 93: 466-475.
27.
Zanetti, M. , Bracco, P. and Costa, L. (2004). Thermal Degradation Behavior of PE/Clay Nanocomposites, Polymer Degradation and Stability , 85: 657-665.
28.
Corrales, T. , Peinado, C., Allen, N.S., Edge, M., Sandoval, G. and Catalina, F. (2003). A Chemiluminescence Study of Micron and Nano Particles Titanium Dioxide: Effect of the Thermal Stability of Metallocence Polyethylene, Journal of Photochemistry and Photobiology A: Chemistry, 156: 151-160.
29.
Zhang, M., Fang, P.F., Zhang, S.P., Wang, B. and Wang, S.J. ( 2003). Study of Structural of HDPE/CaCO3 Nanocomposites by Positrons , Radiation Physics and Chemistry, 68: 565- 567.
30.
Preston, C.M.L. , Amarasinghe, G., Hopewell, J.L., Shanks, R.A. and Mathys, Z. (2004). Evaluation of Polar Ethylene Copolymers as Fire Retardant Nanocomposite Matrices, Polymer Degradation and Stability, 84: 533-544.
31.
Qiu, L., Chen, W. and Qu, B. ( 2006). Morphology and Thermal Stabilization Mechanism of LLDPE/MMT and LLDPE/LDH Nanocomposites, Polymer, 47: 922-930.
32.
Sahebian, S., Zebarjad, S.M., Sajjadi, S.A. and Sherafat, Z. ( 2009). The Effect of Nano-Sized Calcium Carbonate on Thermodynamic Parameters of HDPE, Journal of Materials Processing Technology , 209: 1310-1317.
33.
Zehtabeyazdi, A., Zebarjad, S.M., Sajjadi, S.A. and Abolfazli Esfahani, J. (2007). On the Sensitivity of Dimensional Stability of High Density Polyethylene on Heating Rate, Express Polymer Letters, 1: 92-97.
34.
Wunderlich, B. ( 2005). Thermal Analysis of Polymeric Materials, Springer-Verlag, Berlin.
