Thermoplastic Natural Rubber of Co-Polyamide: Effect of Blend Ratios on Mechanical, Swelling, Dynamic and Morphological Properties

Abstract:

Maleated natural rubber (MNR) was synthesized and formulated to prepare thermoplastic natural rubber (TPNR) by blending with co-polyamide (COPA). It was found that 100% modulus, tensile strength, elongation at break, hardness and degree of swelling increased with increasing proportion of COPA. However, degree of swelling and tension set value decreased which reflects enhancing of rubber elasticity. Dynamic properties were also determined by a rotor less oscillating shear rheometer (Rheo Tech MDpt). It was found that increasing proportion of MNR caused increasing of storage modulus and complex viscosity but decreasing tan δ value. Morphological properties were also determined by SEM technique. It was found that the MNR/COPA simple blends with the proportion of rubber 40, 50 and 60 wt% exhibited the co-continuous phase structures.

• Periodical: Advanced Materials Research (Volume 844)
• Pages: 89-92
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.844.89
• Online since: November 2013
• Authors: Boripat Sripornsawat, Azizon Kaesaman, Charoen Nakason
• Keywords: Co-Polyamide, Maleated Natural Rubber, Simple Blend, Thermoplastic Natural Rubber (TPNR)

References

[1] T. Johnson and S. Thomas, Effect of epoxidation on the transport behavior and mechanical properties of natural rubber, Polym. 41 (2000) 7511-7522.

DOI: 10.1016/s0032-3861(00)00076-8

[2] C. Nakason, A. Kaesaman, Z. Samoh, S. Homsin and S. Kiatkamjornwong, Rheological properties of maleated natural rubber and natural rubber blends, Polym. Test. 21 (2002) 449-455.

DOI: 10.1016/s0142-9418(01)00109-x

[3] V. Tanrattanakul, B. Wattanathai, A. Tiangjunya and P. Muhamud, In situ epoxidized natural rubber: Improved oil resistance of natural rubber, J. Appl. Polym. Sci. 90 (2003) 261-269.

DOI: 10.1002/app.12706

[4] C. Nakason, S. Saiwari and A. Kaesaman, Rheological properties of maleated natural rubber/polypropylene blends with phenolic modified polypropylene and polypropylene-g-maleic anhydride compatibilizers, J. Polym. Test. 25 (2006) 413-423.

DOI: 10.1016/j.polymertesting.2005.11.006

[5] C. Nakason, S. Saiwari and A. Kaesaman, Thermoplastic vulcanites based on maleated natural rubber/polypropylene blends: rheological, mechanical and morphological properties, J. Polym. Eng. 46 (2006) 594-600.

DOI: 10.1002/pen.20498

[6] J. Jeerupun, J. Wootthikanokkhan and P. Phinyocheep, Effects of epoxidation content of ENR on morphology and mechanical properties of natural rubber blended PVC, Macromol. Symp. 216 (2004) 281-92.

DOI: 10.1002/masy.200451226

[7] M. Narathichat, C. Kummerlowe, N. Vennemann and C. Nakason, Thermoplastic natural rubber based on polyamide-12: Influence of blending technique and type of rubber on temperature scanning stress relaxation and other related properties, J. Appl. Polym. Sci. 121 (2011).

DOI: 10.1002/app.33528