Abstract
A statistical experimental design method known as the Taguchi method was utilized to optimize the injection molding processes of poly(butylene terephthalate) (PBT) and poly(trimethylene terephthalate) (PTT) blends. Impact strength was taken as the optimized property. The significant parameters included mold temperature, injection pressure, holding pressure, injection time and holding temperature. Results of the Taguchi analysis gave mold temperatures as major influencing factor on the impact strength. The optimal processing conditions were determined through the Taguchi method giving an increase of 13.7% in impact strength for the blend. Further analysis was done to distinguish the blends dependency on temperature. Differential scanning calorimetry curves indicated the presence of recrystallization peaks that were dependent on the temperature profile the sample had received prior to testing. Polarized optical microscopy was used to show the different sphereulitic growth patterns under varying isothermal conditions. It was seen that at 90°C sphereulitic growth contained pockets of different sized spereulites. AFM imaging was also used to indicate differences in blended polymer morphology.
References
Avramova, N., “Amorphous Poly(ethylene terephthalate)/Poly(butylene terephthalate) Blends: Miscibility and Properties”, Polymer, 36, 801–808 (1995) 10.1016/0032-3861(95)93111-XSearch in Google Scholar
Bosma, M., Ten Brinke, G. and Ellis, T. S., “Polymer-Polymer Miscibility and Enthalpy Relaxations”, Macromolecules, 21, 1465–1470 (1988) 10.1021/ma00183a041Search in Google Scholar
Chuah, H., “Crystallization Kinetics of Poly(Trimethylene Terphthalate)”, Polym. Eng. Sci., 41, 308–313 (2004) 10.1002/pen.10730Search in Google Scholar
Chuang, W., Hong, P. and Chuah, H., “Effects of Crystallization Behavior on Morphological Change in Poly(trimethylene terephthalate) Spherulites”, Polymer, 45, 2413–2425 (2004) 10.1016/j.polymer.2004.01.048Search in Google Scholar
Chen, K., Tang, X., Shen, J., Zhou, Y. and Zhang, B., “Non-isothermal Crystallization Behavior of Poly(trimethylene terephthalate) Synthesized with Different Catalysts”, Macromol. Mater. Eng., 289, 539–547 (2004) 10.1002/mame.200300305Search in Google Scholar
Escala, A., Stein, R., “Crystallization Studies of Blends of Polyethylene Terephthalate and Polybutylene Terephthalate”, Adv. Chem. Series, 176, 455–487 (1979) 10.1021/ba-1979-0176.ch024Search in Google Scholar
Guerrica-Echevarria, G., Eguiazabal, J., “Structure and Mechanical Properties of Impact Modified Poly(butylene terephthalate)/Poly (ethylene terephthalate) Blends”, Polym. Eng. Sci., 49, 1013–1021 (2009) 10.1002/pen.21357Search in Google Scholar
Guijuan, L., Kunyan, W., Xueli, X., Baojie, Y., Shugang, L. and Yanmo, C., “Crystallization Behavior and Crystal Morphology of PTT/PBT Blends”, J. Macromol. Sci., Part B, 45, 485–492 (2006) 10.1080/00222340600769600Search in Google Scholar
Hong, P., Chung, W. and Hsu, C., “Crystallization Kinetics and Morphology of Poly(trimethylene terephthalate)”, Polymer, 43, 3335–3343 (2003) 10.1016/S0032-3861(02)00163-5Search in Google Scholar
Huang, J., Chang, F., “Miscibility, Melting, and Crystallization of Poly(trimethylene terephthalate/Poly(ether imide) Blends”, J. Appl. Polym. Sci., 84, 850–856 (2003) 10.1002/app.10367Search in Google Scholar
Javadi, A., Pilla, S., Gong, S. and Turng, L. S.: “Chapter?Handbook of Bioplastics and Biocomposite Engineering Applications”, in Biobased and Biodegradable PHBV – Based Polymer Blends and Biocomposites Engineering Applications, Pilla, S. (Ed.), Wiley & Sons, New Jersey (2011)10.1002/9781118203699.ch14Search in Google Scholar
Li, G., Wang, K., Xu, X., Yu, B., Li, S. and Chen, Y., “Crystallization Behavior and Crystal Morphology of PTT/PBT Blends,” J. Macromol. Sci., Part B, 45, 485–492 (2006) 10.1080/00222340600769600Search in Google Scholar
Liu, W., Mohanty, A. K., Drzal, L. T., Misra, M., Kurian, J. V. and Miller, R. W., “Injection Molded Glass Fiber Reinforced Poly(trimethylene terephthalate) Composites: A Fabrication and Properties Evaluation”, Ind. Eng. Chem. Res., 44, 857–862 (2005) 10.1021/ie049112fSearch in Google Scholar
Mancza, J., Wunderlich, B., “Phase Transitions in Mesophase Macromolecules. I. Novel Behaviour in the Vitrification of Poly(ethylene terephthalate-Co-P-oxybenzoate)”, J. Macromol. Sci., Part B, 18, 1433–1438 (2003)Search in Google Scholar
Mishra, S., Seopura, B., “Fibers from Poly(ethylene terephthalate) and Poly(butylene terephthalate) Blends I. Mechanical Behaviour”, J. Appl. Polym. Sci., 33, 759–768 (1987) 10.1002/app.1987.070330306Search in Google Scholar
Mohanty, A. K., Misra, M. and Drzal, L. T., “Sustainable Biocomposites from Renewable Resources: Opportunities and Challenges in the Green Materials World”, J. Polym. Environ., 10, 19–26 (2002) 10.1023/A:1021013921916Search in Google Scholar
Montaudo, G., Puglisi, C. and Samperi, F., “Mechanism of Exchange in PBT/PC and PET/PC Blends. Composition of the Copolymer Formed in the Melt Mixing Process”, Macromolecules, 31, 650–661 (1998) 10.1021/ma9712054Search in Google Scholar
Rosato, D., Rosato, D. and Rosato, M.: Injection Moulding Handbook, 3rd Edition, Kluwer Academic Publishers, Assinippi (2000) 10.1007/978-1-4615-4597-2Search in Google Scholar
Run, M., Song, A., Wang, Y. and Ya, C., “Melting, Crystallization Behaviours, and Nonisothermal Crystallization Kinetics of PET/PTT/PBT Ternary Blends”, J. Appl. Polym. Sci., 104, 3459–3468 (2007) 10.1002/app.26147Search in Google Scholar
Sauer, B. B., Kampert, W. G., Neal Blanchard, E., Threefoot, S. A. and Hsiao, B. S., “Temperature Modulated DSC Studies of Melting and Recrystallization in Polymers Exhibiting Multiple Endotherms”, Polymer, 41, 1099–1108 (2000) 10.1016/S0032-3861(99)00258-XSearch in Google Scholar
Supaphol, P., Dangseeyun, N. and Srimoaon, P., “Non-isothermal Melt Crystallization Kinetics for Poly(trimethylene terephthalate)/Poly (butylene terephthalate) Blends”, Polym. Test., 23, 175–185 (2004) 10.1016/S0142-9418(03)00078-3Search in Google Scholar
Taguchi, G., Chowdhurn, S. and Wu, Y.: Taguchi's Quality Engineering Handbook, 1st Edition, Wiley, New Jersey (2004) 10.1002/9780470258354Search in Google Scholar
Vadori, R., Mohanty, A. K. and Misra, M., “The Effect of Mold Temperature on the Performance of Injection Molded Poly(lactic acid)-based Bioplastic”, Macromol. Mater. Eng., online (2013), 10.1002/mame.201200274Search in Google Scholar
Woo, E., Kuo, Y., “Complete Miscibilibty of Ternary Aryl Polyesters Demonstrating a New Criterion Nad Horizon for Miscibility Characterization”, J. Polym. Sci., Part B, 41, 2394–2404 (2003) 10.1002/polb.10591Search in Google Scholar
Wu, C., Han, C., Suzuki, Y. and Mizuno, M., “Transesterification and Mechanical Properties of Blends of a Model Thermotropic Polyester and Polycarbonate”, Macromolecules, 39, 3865–3877 (2006) 10.1021/ma0525583Search in Google Scholar
Wu, P., Woo, M., “Correlation between Melting Behavior and Ringed Spherulites in Poly(trimethylene terephthalate)”, J. Polym. Sci., Part B, 41, 80–93 (2003) 10.1002/polb.10354Search in Google Scholar
Yishan, Y., “Crystallization in Blends of Poly(ethylene terephthalate) and Poly(butylene terephthalate)”, Polym. Eng. Sci., 37, 91–95 (2004)Search in Google Scholar
Zhang, J., “Study of Poly(trimethylene terephthalate) as an Engineering Thermoplastic Material”, J. Appl. Polym. Sci., 91, 1657–1666 (2003) 10.1002/app.13322Search in Google Scholar
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