Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties

Meral Akkoyun; İbrahim Badem; Mert Emre Öztoksoy; Yeşim Aslan

doi:10.29137/umagd.711692

EN

Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties

Abstract

In recent years, many parts of the automotive industry, previously made of metal, has been passed to polymers due to their light weight, ie lower carbon emission and fuel consumption advantage. The aim of this work was to investigate the microstructure and mechanical properties of chemical foaming agent added polypropylene foam samples produced by injection molding. In particular, the effects of injection speed and core back distance on the evolution of cell diameter, compact outer layer thickness, cell density and mechanical properties were examined. In the first step the effect of various injection speeds (110; 125; 140 mm/s) was investigated. Then, various core back positions (0; 0.7 and 1.5 mm) were analyzed at a constant injection speed (110 mm/s). The results showed an increase of the cell diameter, the compact outer layer thickness and the elastic modulus as the injection speed increases. In addition, an important effect of the core back distance was observed with the presence of a critical core back distance. Below this critical value, the cell diameter and the elastic modulus drop due to a notable decrease of the skin layer thickness. Above this critical value, the cells started to collapse and lose their circularity.

Keywords

Polypropylene Foam, Chemical Blowing, Injection Molding, Core back, Microstructure, Mechanical Properties

Supporting Institution

The Scientific Research Projects Units of Bursa Technical University

Project Number

172L09

Thanks

Tofaş Türk Otomobil Fabrikası A.Ş., Farplas Otomotiv A.Ş. and Karel Kalıp San. A.Ş. are gratefully acknowledged for the production of PP/CBA foams at different processing conditions. The Scientific Research Projects Units of Bursa Technical University (under the contract number of 172L09) are also gratefully acknowledged for their financial support.

References

Ameli, A., Jahani, D., Nofar, M., Jung, P. U., Park, C. B. (2014). Development of high void fraction polylactide composite foams using injection molding: mechanical and thermal insulation properties. Composites Science and Technology, 90, 88-95. doi:10.1016/j.compscitech.2013.10.019
Ameli, A., Nofar, M., Jahani, D., Rizvi, G., Park, C. B. (2015). Development of high void fraction polylactide composite foams using injection molding: crystallization and foaming behaviors. Chemical Engineering Journal, 262, 78-87. doi:10.1016/j.cej.2014.09.087
Chu, R. K. M., Mark, L. H., Jahani, D., Park, C. B. (2016). Estimation of the foaming temperature of mold- opening foam injection molding process. Journal of Cellular Plastics, 52(6), 619-641. doi:10.1177/0021955X15592069
Ishikawa, T. & Ohshima, M. (2011). Visual observation and numerical studies of polymer foaming behavior of polypropylene/carbon dioxide system in a core-back injection molding process. Polymer Engineering and Science, 51(8), 1617-1625. doi:10.1002/pen.21945
Ishikawa, T., Taki, K., Ohshima, M. (2012). Visual observation and numerical studies of N2 vs. CO2 foaming behavior in core-back foam injection molding. Polymer Engineering and Science, 52(4), 875-883. doi:10.1002/pen.22154
Jahani, D., Ameli, A., Jung, P. U., Barzegari, M. R., Park, C. B., Naguib, H. (2014). Open-cell cavity integrated injection-molded acoustic polypropylene foams. Materials & Design, 53, 20-28. doi:10.1016/j.matdes.2013.06.063
Lyu, M. Y., Choi, T. G. (2015). Research trends in polymer materials for use in lightweight vehicles. International Journal of Precision Engineering and Manufacturing, 16, 213-220. doi:10.1007/s12541-015-0029-x
Miyamoto, R., Yasuhara, S., Shikuma, H. (2014). Preparation of micro/nanocellular polypropylene foam with crystal nucleating agents. Polymer Engineering and Science, 54(9), 2075-2085. doi:10.1002/pen.23758
Reglero Ruiz, J. A., Vincent, M., Agassant, J.-F. (2016). Numerical modeling of bubble growth in microcellular polypropylene produced in a core-back injection process using chemical blowing agents. International Polymer Processing, 31(1), 26-36. doi:10.3139/217.3129
Reglero Ruiz, J. A., Vincent, M., Agassant, J.-F., Claverie, A., Huck, S. (2015). Morphological analysis of microcellular PP produced in a core-back injection process using chemical blowing agents and gas counter pressure. Polymer Engineering and Science, 55(11), 2465-2473. doi:10.1002/pen.24136

Ries, S., Spoerrer, A., Altstaedt, V. (2013). Foam injection molding of thermoplastic elastomers: Blowing agents, foaming process and characterization of structural foams. AIP Conference Proceedings; 15-19 July 2013; Nuremberg, Germany. AIP: 1593.
Ruiz, J. R., Vincent, M., Agassant, J., Sadik, T., Pillon, C., Carrot, C. (2015). Polymer foaming with chemical blowing agents: Experiment and modeling. Polymer Engineering and Science, 55(9), 2018-2029. doi:10.1002/pen.24044
Saiz-Arroyo, C., de Saja, J. A., Velasco, J. I., Rodriguez-Perez, M.A. (2012). Moulded polypropylene foams produced using chemical or physical blowing agents: structure–properties relationship. Journal of Materials Science, 47, 5680-5692. doi:10.1007/s10853-012-6357-7
Shaayegan, V., Wang, C., Costa, F., Han. S., Park, C. B. (2017). Effect of the melt compressibility and the pressure drop rate on the cell- nucleation behavior in foam injection molding with mold opening. European Polymer Journal, 92, 314-325. doi:10.1016/j.eurpolymj.2017.05.003
Sporrer, A. N. J. & Altstadt, V. (2007). Controlling morphology of injection molded structural foams by mold design and processing parameters. Journal of Cellular Plastics, 43(4-5), 313-330. doi:10.1177/0021955X07079043
Stumpf, M., Sporrer, A., Schmidt, H. W. (2011). Influence of supramolecular additives on foam morphology of injection-molded i-PP. Journal of Cellular Plastics, 47(6), 519-534. doi:10.1177/0021955X11408769
Tomasko, D. L., Burley, A., Feng, L., Yeh, S. K., Miyazono, K., Nirmal-Kumar, S., Kusaka, I., Koelling, K. (2009). Development of CO2 for polymer foam applications. The Journal of Supercritical Fluids, 47(3), 493-499. doi:10.1016/j.supflu.2008.10.018
Wang, L., Ishihara, S., Hikima, Y., Ohshima, M., Sekiguchi, T., Sato, A., Yano, H. (2017). Unprecedented development of ultrahigh expansion injection-molded polypropylene foams by introducing hydrophobic-modified cellulose nanofibers. ACS Applied Materials & Interfaces, 9(11), 9250-9254. doi:10.1021/acsami.7b01329
Wu, H., Zhao, G., Wang, J., Wang, G., Zhang, W. (2019). Effects of process parameters on core-back foam injection molding process. eXPRESS Polymer Letters, 13(4), 390-405. doi:10.3144/expresspolymlett.2019.32
Wu, H., Zhao, G., Wang, G., Zhang, W., Li, Y. (2018). A new core-back foam injection molding method with chemical blowing agents. Materials & Design, 144, 331-342. doi:10.1016/j.matdes.2018.02.043
Xi, Z., Chen, J., Liu, T., Zhao, L., Turng, L. (2016). Experiment and simulation of foaming injection molding of polypropylene/nano-calcium carbonate composites by supercritical carbon dioxide. Chinese Journal of Chemical Engineering, 24(1), 180-189. doi:10.1016/j.cjche.2015.11.016
Zhang, Z. X., Li, Y. N., Xia, L., Ma, Z. G., Xin, Z. X., Lim, J. K. (2014). Fabrication of superhydrophobic film by microcellular plastic foaming method. Applied Physics A, 117, 755-759. doi:10.1007/s00339-014-8615-9
Zhao, J., Zhao, Q., Wang, C., Guo, B., Park, C. B., Wang, G. (2017). High thermal insulation and compressive strength polypropylene foams fabricated by high-pressure foam injection molding and mold opening of nano-fibrillar composites. Materials & Design, 131, 1-11. doi:10.1016/j.matdes.2017.05.093

Details

Primary Language

English

Subjects

Engineering

Journal Section

Research Article

Authors

Meral Akkoyun ^*
0000-0002-8113-5534
Türkiye

İbrahim Badem This is me
0000-0002-3595-7641
Türkiye

Mert Emre Öztoksoy
0000-0002-4199-9768
Türkiye

Yeşim Aslan This is me
0000-0002-1649-1639
Türkiye

Publication Date

June 30, 2020

Submission Date

March 30, 2020

Acceptance Date

June 23, 2020

Published in Issue

Year 2020 Volume: 12 Number: 2

DOI

https://doi.org/10.29137/umagd.711692

IZ

https://izlik.org/JA65LG28NR

APA

Akkoyun, M., Badem, İ., Öztoksoy, M. E., & Aslan, Y. (2020). Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties. International Journal of Engineering Research and Development, 12(2), 638-647. https://doi.org/10.29137/umagd.711692

AMA

1.Akkoyun M, Badem İ, Öztoksoy ME, Aslan Y. Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties. IJERAD. 2020;12(2):638-647. doi:10.29137/umagd.711692

Chicago

Akkoyun, Meral, İbrahim Badem, Mert Emre Öztoksoy, and Yeşim Aslan. 2020. “Polypropylene/Chemical/Blowing/Agent/Foams:/Effect/of/the/Injection/Speed/and/Core/Back/Distance/on/Microstructure/and/Mechanical/Properties”. International Journal of Engineering Research and Development 12 (2): 638-47. https://doi.org/10.29137/umagd.711692.

EndNote

Akkoyun M, Badem İ, Öztoksoy ME, Aslan Y (June 1, 2020) Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties. International Journal of Engineering Research and Development 12 2 638–647.

IEEE

[1]M. Akkoyun, İ. Badem, M. E. Öztoksoy, and Y. Aslan, “Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties”, IJERAD, vol. 12, no. 2, pp. 638–647, June 2020, doi: 10.29137/umagd.711692.

ISNAD

Akkoyun, Meral - Badem, İbrahim - Öztoksoy, Mert Emre - Aslan, Yeşim. “Polypropylene/Chemical/Blowing/Agent/Foams:/Effect/of/the/Injection/Speed/and/Core/Back/Distance/on/Microstructure/and/Mechanical/Properties”. International Journal of Engineering Research and Development 12/2 (June 1, 2020): 638-647. https://doi.org/10.29137/umagd.711692.

JAMA

1.Akkoyun M, Badem İ, Öztoksoy ME, Aslan Y. Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties. IJERAD. 2020;12:638–647.

MLA

Akkoyun, Meral, et al. “Polypropylene/Chemical/Blowing/Agent/Foams:/Effect/of/the/Injection/Speed/and/Core/Back/Distance/on/Microstructure/and/Mechanical/Properties”. International Journal of Engineering Research and Development, vol. 12, no. 2, June 2020, pp. 638-47, doi:10.29137/umagd.711692.

Vancouver

1.Meral Akkoyun, İbrahim Badem, Mert Emre Öztoksoy, Yeşim Aslan. Polypropylene/Chemical Blowing Agent Foams: Effect of the Injection Speed and Core Back Distance on Microstructure and Mechanical Properties. IJERAD. 2020 Jun. 1;12(2):638-47. doi:10.29137/umagd.711692

Cited By

Polipropilen/montmorillonit kompozit köpüğünün fiziksel, termal ve morfolojik özelliklerinin incelenmesi

Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi

https://doi.org/10.17714/gumusfenbil.1444336

In-line Spectroscopic Monitoring of Foaming Gas Concentration during Foam Injection Molding with Chemical Blowing Agents

Industrial & Engineering Chemistry Research

https://doi.org/10.1021/acs.iecr.5c01314

Kırıkkale University, Faculty of Engineering and Natural Science, 71450 Yahşihan / Kırıkkale, Türkiye.

ijerad@kku.edu.tr