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Iranian Polymer Journal

, Volume 28, Issue 4, pp 337–346 | Cite as

A new latent accelerator and study of its effect on physical, mechanical and shelf-life of carbon fiber epoxy prepreg

  • Mina Niazi
  • Mohammad Hosain BeheshtyEmail author
Original Research
  • 33 Downloads

Abstract

The effects of a new latent accelerator and those of two common accelerators of 1-methyl imidazole and 2,4,6-tris(dimethylaminomethyl)phenol (DMP) have been studied in relation to the properties of dicyandiamide (dicy) cured epoxy resin and its prepregs with unidirectional carbon fiber. The new prepared accelerator is an adduct based on DMP (A_DMP). The results showed that the curing behavior of epoxy/dicy did not change when the appropriate amount of new accelerator was used. The amount of 5 phr of new latent accelerator is equal to the amount of 0.6 phr of DMP accelerator and by increasing the amount of new accelerator, the curing reaction of epoxy/dicy increased significantly. Viscosity build-up results and gel time measurements showed the high pot-life of resin system (epoxy/Dicy/A_DMP) and the high shelf-life of their prepreg. The results showed that the lap shear strength of sample containing 5 phr of the new accelerator (A_DMP5) was increased by 127% in comparison to the sample containing 0.6 phr of DMP. Transverse tensile strength and strain-at-break were increased by 27% and 31.7%, respectively. Transverse flexural strength, flexural strain-at-break and flexural modulus increased by 52%, 11% and 60%, respectively. On the other hand, fracture toughness and fracture energy increased significantly by 214% and 700%, respectively. This increase in mechanical properties was due to the bulkiness of the new latent accelerator acting as a toughening agent and also the good adhesion of fiber to the matrix as revealed by scanning electron microscopy.

Keywords

Epoxy resin Carbon fiber Adduct Accelerator Prepreg Composite 

References

  1. 1.
    Sarkar S, Kim B (2018) Synthesis of graphene oxide–epoxy resin encapsulated urea formaldehyde microcapsule by in situ polymerization process. Polym Compos 39:636–644CrossRefGoogle Scholar
  2. 2.
    Mozaffari SM, Beheshty MH, Mirabedini SM (2017) Effect of processing conditions on the microencapsulation of 1-methylimidazole curing agent using solid epoxy resins. Iran Polym J 26:629–637CrossRefGoogle Scholar
  3. 3.
    Mansourian-Tabaei M, Jafari SH, Khonakdar HA (2015) A comparative study on the influence of nanoalumina and carbon nanotubes on thermal stability, adhesion strength and morphology of epoxy adhesives (in Persian). Iran J Polym Sci Technol 27:361–369Google Scholar
  4. 4.
    Khalafi HR, Mortezaei M, Amraei IA (2015) Relationship between the process parameters and resin content of a glass/epoxy prepreg produced by dipping method (in Persian). Iran J Polym Sci Technol 27:391–402Google Scholar
  5. 5.
    Shah PH, Halls VA, Zheng JQ, Batra RC (2018) Optimal cure cycle parameters for minimizing residual stresses in fiber-reinforced polymer composite laminates. J Compos Mater 52:773–792CrossRefGoogle Scholar
  6. 6.
    Perret P, Gerard JF, Chabert BA (1987) A new method to study the fiber matrix interface in unidirectional composite materials: application for carbon fiber-epoxy composite. Polym Test 7:405–418CrossRefGoogle Scholar
  7. 7.
    Sivashanker S, Fleck NA, Sutcliffe PF (1996) Microbuckle propagation in a unidirectional carbon fiber-epoxy matrix composite. Acta Mater 44:2581–2590CrossRefGoogle Scholar
  8. 8.
    Kim BC, Park DC, Kim DJ, Lee DG (2010) Through-thickness compressive strength of a carbon/epoxy composite laminate. Compos Struct 92:480–487CrossRefGoogle Scholar
  9. 9.
    Park YB, Song MG, Kim JJ, Kwean JH, Choi JH (2010) Strength of carbon/epoxy composite single-lap bonded joints in various environmental conditions. Compos Struct 92:2173–2180CrossRefGoogle Scholar
  10. 10.
    Hayaty M (2010) Thermal-rheological analysis of a glass/epoxy prepreg and increasing room temperature shelf life, PhD thesis. Iran Polymer and Petrochemical InstituteGoogle Scholar
  11. 11.
    Hayaty M, Beheshty MH, Esfandeh M (2011) Isothermal differential scanning calorimetry study of a glass/epoxy prepreg. Polym Adv Technol 22:1001–1006CrossRefGoogle Scholar
  12. 12.
    Hayaty M, Beheshty MH, Esfandeh M (2011) Cure kinetics of a glass/epoxy prepreg by dynamic differential scanning calorimetry. J Appl Polym Sci 120:62–69CrossRefGoogle Scholar
  13. 13.
    Hayaty M, Beheshty MH, Esfandeh M (2011) A new approach for determination of gel time of a glass/epoxy prepreg. J Appl Polym Sci 120:1483–1489CrossRefGoogle Scholar
  14. 14.
    Guthner T, Hammer B (1993) Curing of epoxy resins with dicyandiamide and urones. J Appl Polym Sci 50:1453–1459CrossRefGoogle Scholar
  15. 15.
    Lee YD, Wang SK, Chin WK (1986) Liquid-rubber-modified epoxy adhesives cured with dicyandiamide. I. Preparation and characterization. J Appl Polym Sci 32:6317–6327CrossRefGoogle Scholar
  16. 16.
    Liu XD, Kimura M, Sudo A, Endo T (2010) Accelerating effects of N-aryl-N0, N0-dialkyl ureas on epoxy-dicyandiamide curing system. J Appl Polym Sci 48:5298–5305CrossRefGoogle Scholar
  17. 17.
    Poisson N, Maazouz A, Sautereau H, Taha M, Gambert X (1998) Curing of dicyandiamide epoxy resins accelerated with substituted ureas. J Appl Polym Sci 69:2487–2497CrossRefGoogle Scholar
  18. 18.
    Hesabi M, Salimi A, Beheshty MH (2017) Effect of tertiary amine accelerators with different substituents on curing kinetics and reactivity of epoxy/dicyandiamide system. Polym Test 59:344–354CrossRefGoogle Scholar
  19. 19.
    Hayaty M, Honarkar H, Beheshty MH (2013) Curing behavior of dicyandiamide/epoxy resin system using different accelerators. Iran Polym J 22:591–598CrossRefGoogle Scholar
  20. 20.
    Cao M, Xie P, Jin Z, Zhang Y, Zhang R, Ghung TS (2002) Novel microencapsulated curing accelerator for prolonging shelf life of epoxy resin composition. J Appl Polym Sci 85:873–875CrossRefGoogle Scholar
  21. 21.
    Xing S, Yang J, Huang Y, Zheng Q, Zeng J (2015) Preparation and characterization of a novel microcapsule-type latent curing agent for epoxy resin. Mater Des 85:661–670CrossRefGoogle Scholar
  22. 22.
    Dalle Vacche S, Michaud SD, Demierre V, Bourban M, Manson JA (2016) Curing kinetics and thermomechanical properties of latent epoxy/carbon fiber composites. Mater Sci Eng 139:1–8Google Scholar
  23. 23.
    Dilip K, Chaudhuri R, Chiao WB, Schoenberg JE (1981) Co-curing agents for epoxy resins. National Starch and Chemical Corporation. US4268656 AGoogle Scholar
  24. 24.
    Hesabi MN (2018) PhD Thesis, Iran Polymer and Petrochemical Institute, Tehran, IranGoogle Scholar
  25. 25.
    Hesabi MN, Salimi A, Beheshty MH (2019) Development of amine-based latent accelerator for one-pot epoxy system with low curing temperature and high shelf life. Eur Polym J 112:736–748CrossRefGoogle Scholar
  26. 26.
    ASTM D4217-07 (2017) Standard test methods for gel time of thermosetting coating powderGoogle Scholar
  27. 27.
    ASTM D1002-10 (2010) Standard test methods for apparent shear strength of single-lap joint adhesively bonded metal specimens by tension loading (Metal-to-Metal)Google Scholar
  28. 28.
    ASTM D3039-17 (2017) Standard test methods for tensile properties of polymer matrix composite materialsGoogle Scholar
  29. 29.
    ASTM D5045–14 (2014) Standard test methods for plane–strain fracture toughness and strain energy release rate of plastic materialGoogle Scholar
  30. 30.
    Pascault JP, Williams RJJ (2010) Epoxy polymers. Wiley, WeinheimCrossRefGoogle Scholar
  31. 31.
    Agarwal BD, Broutman LJ, Chandrashekhara K (2017) Analysis and performance of fiber composites. 4th ed. Wiley, New YorkGoogle Scholar

Copyright information

© Iran Polymer and Petrochemical Institute 2019

Authors and Affiliations

  1. 1.Islamic Azad University, North Tehran BranchTehranIran
  2. 2.Composite DepartmentIran Polymer and Petrochemical InstituteTehranIran

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