RFP_2018_01_Ansarifar.pdf (3.01 MB)
Kaolin reinforcement of some rubbers with novel sulfur cure systems
journal contribution
posted on 2018-03-08, 13:14 authored by Ali Ansarifar, Saad SheikhA large amount of kaolin (China clay) was used to reinforce the hardness, tensile strength, elongation at break, stored energy density at break, tear resistance, and Young’s modulus of some sulfur-cured NR, BR and EPDM. The kaolin surface had been pre-treated with 3-mercaptopropyltrimethoxysilane (MPTS) to reduce its polarity and prevent it from adsorbing moisture which could have been detrimental to the cure of the rubbers. For NR, the hardness and Young’s modulus improved, tensile strength and tear resistance were unchanged and the remaining properties deteriorated when kaolin was added. The viscosity increased and the scorch and optimum cure times decreased with kaolin. The highest cure rate ever reported for a sulfur-cured NR-based compound was achieved when kaolin was mixed with the rubber. For BR and EPDM, most of the properties including the viscosity gained significantly from the presence
of kaolin in the rubbers. It was concluded that kaolin was an extending or non-reinforcing
filler for NR, and highly reinforcing for BR and EPDM. Notably, the scorch and optimum cure times and cure rate of BR benefited so much, whereas with the exception of the scorch time, the optimum cure time and cure rate of EPDM were adversely affected by kaolin. The addition of kaolin increased the crosslink density of NR but had a detrimental effect on the crosslink density of BR and EPDM. The early indications
are that kaolin is a viable alternative to carbon black and silica/silane systems in rubber reinforcement.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Rubber Fibres and Plastics Magazine of GermanyVolume
13Issue
1Pages
44 - 50 (7)Citation
ANSARIFAR, A. and SHEIKH, S.H., 2018. Kaolin reinforcement of some rubbers with novel sulfur cure systems. Rubber Fibres Plastics International, 13(1), pp. 44-50.Publisher
Dr Heinz B. P. GuptaVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2017-11-30Publication date
2018Notes
This paper is produced with kind permission of the publisher.ISSN
1863-7116Language
- en