Effect of matrix modification on the mechanical properties of short carbon fiber-reinforced epoxy composites

Abstract

Effects of matrix modification using liquid epoxidized natural rubber (LENR) on the mechanical behavior of short CFreinforced epoxy composite were investigated in this study. Composite samples were prepared in four different concentrations: 3, 5, 7, and 10 wt% fiber fractions. Flexural and fracture toughness tests were performed to observe the mechanical behavior of the samples. LENR improved the mechanical properties due to the plasticizing effect of rubber particles which increased the flexibility and led to a higher debonding strength. The results showed that the treated carbon had improved the flexural strength and flexural modulus by 77% and 21.8% at 7 wt% fiber loadings, respectively, while fracture toughness increased by 15% at 10 wt% fiber loadings compared to the neat epoxy.

Keywords

short carbon fiber polymer composite liquid-epoxidized natural rubber toughness mechanical properties

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References

Jang BZ , Chen LC , Wang CZ , Lin HT and Zee RH Impact resistance and energy absorption mechanism in hybrid composites. Compos Sci Technol 1989; 34: 305 335.

Chen SF and Jang BZ Fracture behavior of interleaved fiber composites. Compos Sci Technol 1992; 41: 77 97.

Ray D. and Rout J. Natural fibres, biopolymers and bio-composites. Boca Raton : CRC Press, Taylor and Francis, 2005, pp.291 341.

Saadati P. , Baharvand H. , Rahimi A. and Morshedian J. Effect of modified liquid rubber on increasing toughness of epoxy resins. Iran Polym J 2005; 14(7): 637 646.

Calabrese L. and Valenza A. Effect of CTBN rubber inclusions on the curing kinetic of DGEBA-DGEBF epoxy resin. Eur Polym J 2003; 39: 1355 1363.

Thomas R. , Durix S. , Sinturel C. , et al. Cure kinetics, morphology and miscibility of modified DGEBA-based epoxy resin effects of liquid rubber inclusion. Polymer 2007; 48: 1695 1710.

Auad ML , Frontini PM , Borrajo J. and Aranguren MI Liquid rubber modified vinyl ester resins: fracture and mechanical behaviour . Polymer 2001; 42: 3723 3730.

Jang J. and Yang H. Toughness improvement of carbonfibre/polybenzoxazine composites by rubber modification. Compos Sci Technol 2000; 60: 457 463.

Ozturk A. , Kaynak C. and Tincer T. Effects of liquid rubber modification on the behaviour of epoxy resin. Eur Polym J 2001; 37: 2353 2363.

10.

Thomas R. , Yumei D. , Yuelong H. , et al. Miscibility, morphology, thermal and mechanical properties of a DGEBA based epoxy resin toughened with a liquid rubber. Polymer 2008; 49: 278 294.

11.

Kaynak C. , Orgun O. and Tincer T. Matrix and interface modification of short carbon fiber-reinforced epoxy. Polym Test 24: 455 462.

12.

Jayle L. , Bucknall CB , Partridge IK , Hay JN , Fernyhough A. and Nozue I. Ternary blends of epoxy, rubber and polycarbonate: phase behaviour, mechanical properties and chemical interactions. Polymer 1996; 37(10): 1897 1996.

13.

Geethamma VG , Kalaprasad G. , Gabriel G. and Thomas S. Dynamic mechanical behaviour of short coir fiber reinforced natural rubber composites. Composites Part A 2005; 36: 1499 1506.

14.

Ghosh P. , Bose NR , Mitra BC and Das S. Dynamic mechanical analysis of FRP composites based on different fibre reinforcements and epoxy resin as the matrix material. J Appl Polym Sci 1997; 62: 2467 2472.

15.

Rana AK , Mitra BC and Banerjee AN Short jute-fibre reinforced polypropylene composites: dynamic mechanical study . J Appl Polym Sci 1999; 71: 531 539.

16.

Ray D. , Sarkar BK , Das S. and Rana AK Dynamic mechanical and thermal analysis of vinylester-resin-matrix composites reinforced with untreated and alkali-treated jute fibres. Compos Sci Technol 2002; 62: 911 917.

17.

Saha AK , Das S. , Bhatta D. and Mitra BC Study of jute fibre reinforced polyester composites by dynamic mechanical analysis. J Appl Polym Sci 1999; 71: 1505 1513.