Abstract

The sizing treatments of PAN-based carbon fiber surfaces were carried out in order to improve the interfacial adhesion in the carbon fibers/nylon6 composite system. The parameter to characterize the wetting performance and surface free energy of the sized fibers were determined by a contact angle method. The mechanical interfacial properties of the composites were investigated using critical stress intensity factor ($K_{IC}$). The cross-section morphologies of sized CFs/nylon6composites were observed by SEM. As the experimental results, it was observed that silane-based sizing treated carbon fibers showed higher surface free energies than other sizing treatments. In particular, the KIC of the sizing-treated carbon fibers reinforced composites showed higher values than those of untreated carbon fibers-reinforced composites. This result indicated that the increase in the surface free energy of the fibers leads to the improvement of the mechanical interfacial properties of carbon fibers/nylon6 composites.

Keywords

• carbon fibers;
• nylon6;
• interfacial mechanical;
• properties;
• sizing treatment

File

Download PDF

References

1. M. M. Schwartz, "Composite Materials Handbook", 2nd ed., McGraw-Hill, New-York, 1992.
2. W. S. Smith, "Engineered Materials Handbook", vol. 1, ASM International, Ohio, 1987.
3. J. B. Donnet and R. C. Bansal, "Carbon Fibers", 2nd ed., p. 95-121, Marcel Dekker, New-York, 1990.
4. E. Fitzer, "Carbon Fibers and Their Composites", Springer- Verlag, New-York, 1992.
5. R. S. Bauer, "Epoxy Resin Chemistry", ACS Advances in Chemistry Series No. 114, American Chemical Society, Washington DC, 1979.
6. S. J. Park, in "Interfacial Forces and Fields: Theory and Applications", ed. By J. P. Hsu, chap. 9, Marcel Dekker, New-York, 1999.
7. J. R. Fried, "Polymer Science and Technology", p. 276-287, Prentice Hall, 1995.
8. P. K. Mallick, "Fiber-Reinforced Composites; Materials, Manufacturing, and Design", p. 23-29, Marcel Dekker, New York and Basel, 1988.
9. S. L. Chuang, N. J. Chu, and W. T. Whang, "Effect of polyamic acids on interracial shear strength in carbon fiber/aro- matic thermoplastics", J. Appl. Polymer Sci., 41, 373 (1990). https://doi.org/10.1002/app.1990.070410129
10. R. V. Subramanian et al., "Electrodeposition of a Polymer Interphase in Carbon-Fiber Composites", Polym. Compos., 7, 201 (1986). https://doi.org/10.1002/pc.750070403
11. O. K. Johannson, F. O. Stark, G.E. Vogel, and R. M. Flesichmann, "Evidence for chemical bond formation at silane coupling agent interfaces", J. Comp. Mater., 1, 278 (1967).
12. J. L. Koenig and P. T. K. Shih, "Raman Studies of the Glass Fiber-Silane-Resin", J. Colloid. Interface Sci., 36, 247 (1971). https://doi.org/10.1016/0021-9797(71)90169-X
13. S. J. Park and Y. S. Jang, "Interfacial Characteristics and Fracture Toughness of Electrolytically Ni-Plated Carbon Fiber-Reinforced Phenolic Resin Matrix Composites", J. Colloid Interface Sci., 237, 91 (2001). https://doi.org/10.1006/jcis.2001.7441
14. S. J. Park, M. H. Kim, J. R. Lee, and S. W. Choi, "Effect of Fiber-Polymer Interactions on Fracture Toughness Behavior of Carbon Fiber-Reinforced Epoxy Matrix Composites", J. Colloid Interface Sci., 228, 287 (2000). https://doi.org/10.1006/jcis.2000.6953
15. S. J. Park, B. J. Kim, D. I. Seo, K. Y. Rhee, and Y. Y. Lyu, "Effects of a silane treatment on the mechanical interfacial properties of montmorillonite/epoxy nanocomposites", Mater. Sci. Eng. A., 526, 74 (2009). https://doi.org/10.1016/j.msea.2009.07.023
16. F. L. Jin, and S. J. Park," Impact-strength improvement of epoxy resins reinforced with a biodegradable polymer", Mater. Sci. Eng. A., 478, 402 (2008). https://doi.org/10.1016/j.msea.2007.05.053
17. S. J. Park, M. K. Seo, and J. R. Lee, "Roles of interfaces between carbon fibers and epoxy matrix on interlaminar fracture toughness of composites", Compos. Interfaces, 13, 249 (2006). https://doi.org/10.1163/156855406775997079