JournalofrubberresearchOct2018.pdf (316.61 kB)
Download file

Some factors affecting the flex life of polybutadiene rubber vulcanisate

Download (316.61 kB)
journal contribution
posted on 02.12.2019, 09:54 by Muhammad Farooq, Ali Ansarifar
Flex life of three different grades of polybutadiene rubber (BR) with highly linear chains, linear chains and long-branched chains was measured. The rubbers were reinforced with a precipitated silica nanofiller, the surface of which had been pre-treated with sulphur-bearing bis(3-triethoxysilylpropyl-)-tetrasulphane (TESPT) coupling agent. The rubbers were cured by reacting the sulphur in TESPT with the rubber chains to produce vulcanisates. The mechanical properties of the rubber vulcanisates such as tensile strength, Young’s modulus, elongation at break, stored energy density at break and tear energy were subsequently determined. The flex life of the rubber vulcanisates was also measured at a constant maximum strain amplitude and a test frequency of 3.17 Hz at ambient temperature. Additionally, the flex life of some unfilled rubber vulcanisates of similar Mooney viscosities cured with elemental sulphur was also measured. For the silica-filled rubber vulcanisate, the rubber with the highly linear chains had the longest flex life and the one with long-branched chains, the shortest flex life. It seemed that a correlation between the flex life and the molecular chains structure might exist despite the crosslink density of the rubber vulcanisates being different and the compounds having silica in them. For the unfilled rubber vulcanisates, the rubber with highly linear chains had the longest flex life and the one with linear chains the shortest flex life. Therefore, it was concluded that the flex life of the rubber vulcanisate was determined, to a large extent, by the molecular chains structure of the raw rubber, irrespective of whether the rubber had reinforcing silica filler, different crosslink densities and different initial viscosities or not. A similar trend was also observed for some of the mechanical properties. For example, the elongation at break was lower and Young’s modulus higher for the silica-filled rubber vulcanisates with long-branched chains than those measured for the silica-filled rubber vulcanisate with highly linear chains.

Funding

University of Engineering and Technology, Lahore, Pakistan

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of Rubber Research

Volume

22

Issue

1

Pages

23 - 29

Publisher

Springer

Version

AM (Accepted Manuscript)

Rights holder

© The Malaysian Rubber Board

Publisher statement

This is a post-peer-review, pre-copyedit version of an article published in Journal of Rubber Research. The final authenticated version is available online at: https://doi.org/10.1007/s42464-019-00003-0.

Acceptance date

15/12/2018

Publication date

2019-01-17

Copyright date

2019

ISSN

1511-1768

eISSN

2524-3993

Language

en

Depositor

Dr Ali Ansarifar. Deposit date: 2 December 2019