Abstract
The ageing of a new family of thermoplastic elastomers from blends of natural rubber and polyethylene was studied using thermal treatments at 65°, 80° and 90°C. The effects of including various stabilizers and dynamic vulcanization were also investigated. The results of UV ageing in a weatherometer and sunlight ageing of the same samples were compared. Thermal ageing of the blends of two polymers caused the tensile properties to deteriorate, especially at longer times or higher temperatures of ageing. The tensile strength and modulus of dynamically vulcanized blends, which registered higher tensile properties, increased in the initial stage on thermal ageing before a final drop. When an antioxidant for rubber or heat or light stabilizer for polyethylene was added, thermooxidative stability was increased. Dynamic mechanical properties also indicated changes due to ageing. UV and sunlight ageing of the samples revealed that the antioxidant for rubber improved the properties. The results are explained in terms of crosslinking, degradation and crystallinity of the blends. No cracking was observed on the surfaces of the aged samples, even under prolonged periods of ageing and on extending the specimens under the microscope.
Similar content being viewed by others
References
A. K. Bhowmick and H. L. Stephens (eds.), “Handbook of Elastomers-New Developments and Technology” (Marcel Dekker, NY, 2001).
S. K. De and A. K. Bhowmick (eds.), “Thermoplastic Elastomers from Rubber-Plastic Blends” (Ellis Horwood, Chichester, 1990).
A. Y. Coran and R. Patel,US Patent no. 4, 104, 210 (August 1, 1978).
N. Roy choudhury and A. K. Bhowmick, J. Appl. Polym. Sci. 38 (1989) 1091.
A. Jha and A. K. Bhowmick, Rubb. Chem. Tech. 70 (1997) 798.
M. Ginic-markovic, N. Roy choudhury, M. Dimopoulos and J. G. Matisons, Polym. Degrad. Stab. 69 (2000) 157.
N. Roy choudhury and A. K. Bhowmick, Polym. Degrad. Stab. 25 (1989) 39.
J. Lliot, in “Developments in Rubber Technology,” Vol. 3, edited by A. J. Whelan and L. S. Lee (Applied Science Publishers, London, 1982) p. 203.
A. K. Bhowmick, J. Heslop and J. R. White, Polym. Degrad. Stab. 74 (2001) 513.
A. K. Bhowmick, J. Heslop and J. R. White, J. Appl. Polymer Science, in press.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bhowmick, A.K., White, J.R. Thermal, UV- and sunlight ageing of thermoplastic elastomeric natural rubber-polyethylene blends. Journal of Materials Science 37, 5141–5151 (2002). https://doi.org/10.1023/A:1021076724403
Issue Date:
DOI: https://doi.org/10.1023/A:1021076724403