Study of Improving Fracture Toughness of Un-Saturated Polyester with Addition of Mixing Percentage of CPO Oils



Nusyirwan Adnand (Andalas University)
Ilham S (Andalas University)


Unsaturated polyester is a polymer that is widely used as a basic matrix to form strong composites for engineering applications such as for cars, ships and aeroplanes. The advantages of using this material are owing to have a fairly high tensile strength when reinforced with appropriate reinforcing fibers, light and easy to shape. However, due to its brittle nature, this material cannot withstand shock loads. Therefore, it is necessary to overcome that weakness. Crude Palm Oil (CPO) can give benefits as a strengthening agent. However, its proper mixture to polyester need to be figured out so that it would help in improving crack resistance properties of this polyester. This can be done by determining of fracture resistance value of the mixture polymer. A crack resistance testing was carried out and crthe itical stress intensity factor was calculated based on ASTM D 5005. The composition of the CPO mixture was varied from 100%: 0%, 10%: 20%, 30%: 40%. From the test results, it can be identified that the greatest critical stress intensity factor is  = 15.787  MPa.m1/2. This is found out in composition of 30% CPO. Meanwhile the critical intensity factor of pure Unsaturated Polyester (UP) is only 2,023 MPa.m1/2. There is approximately 700% improvement that can be gained in mixing with CPO.

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S. Jeyanthi and J. Janci Rani, “Improving mechanical properties by KENAF natural long fiber reinforced composite for automotive structures,” J. Appl. Sci. Eng., vol. 15, no. 3, pp. 275–280, 2012, doi: 10.6180/jase.2012.15.3.08.

Z. Othman, M. P. Saiman, M. F. A. Hamid, and M. N. Taliban, “The application of 2D woven kenaf reinforced unsaturated polyester composite in automotive interiors,” IOP Conf. Ser. Mater. Sci. Eng., vol. 368, no. 1, 2018, DOI: 10.1088/1757-899X/368/1/012032.

M. T. Islam et al., “Effect of Coconut Shell Powder as Filler on the Mechanical Properties of Coir-polyester Composites,” Chem. Mater. Eng., vol. 5, no. 4, pp. 75–82, 2017, DOI: 10.13189/cme.2017.050401.

A. Balaji, R. Purushothaman, R. Udhayasankar, S. Vijayaraj, and B. Karthikeyan, “Study on Mechanical, Thermal and Morphological Properties of Banana Fiber-Reinforced Epoxy Composites,” J. Bio- Tribo-Corrosion, vol. 6, no. 2, 2020, DOI: 10.1007/s40735-020-00357-8.

Nusyirwan, H. Abril, M. Hakim, and R. Vadia, “The potential of rising husk fiber/native sago starch reinforced biocomposite to the automotive component,” IOP Conf. Ser. Mater. Sci. Eng., vol. 602, no. 1, 2019, DOI: 10.1088/1757-899X/602/1/012085.

H. Oliver-Ortega, F. Julian, F. X. Espinach, Q. Tarrés, M. Ardanuy, and P. Mutjé, “Research on the use of lignocellulosic fibers reinforced bio-polyamide 11 with composites for automotive parts: Car door handle case study,” J. Clean. Prod., vol. 226, pp. 64–73, 2019, DOI: 10.1016/j.jclepro.2019.04.047.

H. Tuo, Z. Lu, X. Ma, J. Xing, and C. Zhang, “Damage and failure mechanism of thin composite laminates under low-velocity impact and compression-after-impact loading conditions,” Compos. Part B Eng., vol. 163, no. August 2018, pp. 642–654, 2019, doi: 10.1016/j.compositesb.2019.01.006.

L. Prasad, V. Singh, R. V. Patel, A. Yadav, V. Kumar, and J. Winczek, “Physical and Mechanical Properties of Ramban's (Agave) Fiber Reinforced with Polyester Composite Materials,” J. Nat. Fibers, 2021, DOI: 10.1080/15440478.2021.1904481.

T. Gobikannan et al., “Flexural properties and failure mechanisms of infusible thermoplastic- and thermosetting based composite materials for marine applications,” Compos. Struct., vol. 273, p. 114276, 2021, DOI: 10.1016/j.compstruct.2021.114276.

S. Wahono, A. Irwan, E. Syafri, and M. Asrofi, “Preparation and characterization of Ramie Cellulose Nanofibers/CaCO3 Unsaturated Polyester Resin composites,” ARPN J. Eng. Appl. Sci., vol. 13, no. 2, pp. 746–751, 2018.

A. T. Seyhan, M. Tanoǧlu, and K. Schulte, “Tensile mechanical behavior and fracture toughness of MWCNT and DWCNT modified vinyl-ester/polyester hybrid nanocomposites produced by 3-roll milling,” Mater. Sci. Eng. A, vol. 523, no. 1–2, pp. 85–92, 2009, DOI: 10.1016/j.msea.2009.05.035.

H. Abril et al., “Improving impact, tensile and thermal properties of thermoset unsaturated polyester via mixing with thermoset vinyl ester and methyl methacrylate,” Polym. Test., vol. 81, no. August 2019, p. 106193, 2020, DOI: 10.1016/j.polymertesting.2019.106193.

M. Mandhakini, S. Devaraju, M. R. Venkatesan, and M. Alagar, “Linseed vinyl ester fatty amide toughened unsaturated polyester- bismaleimide composites,” High Perform. Polym., vol. 24, no. 3, pp. 237–244, 2012, DOI: 10.1177/0954008311436263.

P. Hari Sankar, Y. V. Mohana Reddy, and K. Hemachandra Reddy, “Polyester/vinyl ester polymer hybrid blended nanocomposites: Effect of nano on mechanical and thermal properties,” Fibers Polym., vol. 16, no. 2, pp. 443–448, 2015, DOI: 10.1007/s12221-015-0443-9.

H. Ardhyananta et al., “Mechanical and Thermal Properties of Unsaturated Polyester/Vinyl Ester Blend Cured at Room Temperature,” IOP Conf. Ser. Mater. Sci. Eng., vol. 202, no. 1, 2017, DOI: 10.1088/1757-899X/202/1/012088.

J. Njuguna, P. Wambua, and K. Pielichowski, Cellulose Fibers: Bio- and Nano-Polymer Composites. 2011.

J. S. Ullett and R. P. Chartoff, “Toughening of unsaturated polyester and vinyl ester resins with liquid rubbers,” Polym. Eng. Sci., vol. 35, no. 13, pp. 1086–1097, 1995, doi: 10.1002/pen.760351304.

M. T. Albdiry and B. F. Yousif, “Toughening of brittle polyester with functionalized halloysite nanocomposites,” Compos. Part B Eng., vol. 160, no. October 2018, pp. 94–109, 2019, DOI: 10.1016/j.compositesb.2018.10.032.

H. N. Dhakal and S. O. Ismail, Unsaturated polyester resins: Blends, interpenetrating polymer networks, composites, and nanocomposites. Elsevier Inc., 2019.

N. Hiremath, S. Young, H. Ghossein, D. Penumadu, U. Vaidya, and M. Theodore, “Low-cost textile-grade carbon-fiber epoxy composites for automotive and wind energy applications,” Compos. Part B Eng., vol. 198, no. May, p. 108156, 2020, doi: 10.1016/j.compositesb.2020.108156.

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