Polímeros: Ciência e Tecnologia
Polímeros: Ciência e Tecnologia
Original Article

Epoxidized natural rubber and hydrotalcite compounds: rheological and thermal characterization

Silva, Vanessa Macedo da; Nunes, Regina Célia Reis; Sousa, Ana Maria Furtado de

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Epoxidized natural rubber (ENR) and synthetic non-modified hydrotalcite (HT) compounds were prepared and evaluated. Natural rubber (NR) was epoxidized with 20.6% of epoxy groups from a chemical modification of the latex. A sulfur-based curing system formulation with accelerators was used. The amounts of HT in the ENR-HT compositions was varied between 0, 2, 3 and 5 phr. All compositions were evaluated as to cure parameters, rheological properties, thermal resistance and crosslink density. The results showed that the mineral filler does not have a significant influence on the cure parameters. Different methods of crosslink density determination were used (swelling at equilibrium and elastic modulus). The results turn out to be equivalent and rise as the amount of filler is increased. The best results were found for the 5 phr hydrotalcite compound (ENR-HT5).


crosslink density, epoxidized natural rubber, layered double hydroxide, rheological behavior, thermal behavior


1. Basu, D., Das, A., Stockelhuber, K. W., Wagenknecht, U., & Heinrich, G. (2014). Advances in layered double hydroxide (LDH) – based elastomer composites. Progress in Polymer Science, 39(3), 594-626. http://dx.doi.org/10.1016/j.progpolymsci.2013.07.011.

2. Pradhan, S., Costa, F. R., Wagenknect, U., Jehnichen, D., Bhowmick, A. K., & Heinrich, G. (2008). Elastomer/LDH nanocomposites: synthesis and studies on nanoparticle dispersion, mechanical properties and interfacial adhesion. European Polymer Journal, 44(10), 3122-3132. http://dx.doi.org/10.1016/j.eurpolymj.2008.07.025.

3. Das, A., Wang, D.-Y., Leuteritz, A., Subramanian, K., Grenwell, H. C., & Wagenknecth, U. (2011). Preparation of zinc oxide free, transparent rubber nanocomposites using a layered double hydroxide filler. Journal of Materials Chemistry, 21(20), 7194-7200. http://dx.doi.org/10.1039/c0jm03784b.

4. Laskowska, A., Zaborski, M., Gain, O., Marzec, A., & Maniukeiwicz, W. (2014). Ionic elastomers based on carboxylated nitrile rubber (XNBR) and magnesium aluminum layered double hydroxide filler. Express Polymer Letters, 8(6), 374-386. http://dx.doi.org/10.3144/expresspolymlett.2014.42.

5. Yu, H., Zeng, Z., Lu, G., & Wang, Q. (2008). Processing characteristics and thermal stabilities of gel and sol of epoxidized natural rubber. European Polymer Journal, 44(2), 453-464. http://dx.doi.org/10.1016/j.eurpolymj.2007.11.016.

6. Gan, S.-N., & Hamid, Z. A. (1997). Partial conversion groups to diols in epoxidized natural rubber. Polymer, 38(8), 1953-1956. http://dx.doi.org/10.1016/S0032-3861(96)00710-0.

7. Sanguansap, K., Suteewong, T., Saendee, P., Buranabunya, U., & Tangboriboonrat, P. (2005). Composite natural rubber based latex particles: a novel approach. Polymer, 46(4), 1373-1378. http://dx.doi.org/10.1016/j.polymer.2004.11.074.

8. Flory, P. J. (1953). Principles of polymer chemistry. New York: Cornell University Press.

9. Lee, S., Pawlowsky, H., & Coran, A. Y. (1994). Method for estimating the chemical crosslink densities of cured natural rubber and styrene-butadiene rubber. Rubber Chemistry and Technology, 67(5), 854-864. http://dx.doi.org/10.5254/1.3538716.

10. Othman, M. R., Rasid, N. M., & Fernando, W. J. N. (2006). Mg-Al hydrotalcite coating on zeolites for improved carbon dioxide adsorption. Chemical Engineering Science, 61(5), 1555-1560. http://dx.doi.org/10.1016/j.ces.2005.09.011.

11. Costa, F. R., Leuteritz, A., Wagenknetch, U., Jehnichen, D., Haubler, L., & Heinrich, G. (2008). Intercalation of Mg-Al layered double hydroxide by anionic surfactants: preparation and characterization. Applied Clay Science, 38(3-4), 153-164. http://dx.doi.org/10.1016/j.clay.2007.03.006.

12. Chuayjuljit, S., Yaowasang, C., Ranomg-NA, N., & Potiyaraj, P. (2006). Oil resistance and physical properties of in situ epoxidized natural rubber from high ammonia concentrated latex. Journal of Applied Polymer Science, 100(5), 3948-3955. http://dx.doi.org/10.1002/app.22998.

13. Saito, T., Klinklai, W., & Kawahara, S. (2007). Characterization of epoxidized natural rubber by 2D NMR spectroscopy. Polymer, 48(3), 750-757. http://dx.doi.org/10.1016/j.polymer.2006.12.001.

14. Klinklai, W., Kawahara, S., Mizumo, T., Yoshizawa, M., Sakdapipanich, J. T., Isono, Y., & Ohno, H. (2003). Depolymerization and ionic conductivity of enzymatically deproteinized natural rubber having epoxy group. European Polymer Journal, 39(8), 1707-1712. http://dx.doi.org/10.1016/S0014-3057(03)00060-0.

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