Journal
POLYMER TESTING
Volume 32, Issue 4, Pages 631-639Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2013.03.019
Keywords
Natural rubber; Recycled ethylene propylene diene monomer; Carbon black; Thermal stability; Storage modulus
Funding
- Institute of Postgraduate Studies (IPS), Universiti Sains Malaysia [1001/PBAHAN/8045014]
- Ministry of Higher Education (MOHE), Malaysia [203/PBAHAN/6730066]
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Blends of natural rubber/virgin ethylene propylene diene monomer (NR/Virgin EPDM) and natural rubber/recycled ethylene propylene diene monomer (NR/Recycled EPDM) were prepared on a two-roll mill. A fixed amount of carbon black at 30 parts per hundred rubbers (phr) was also incorporated. Three different thermal studies, namely thermo-oxidative ageing, thermogravimetric analysis and dynamic mechanical analysis, were carried out and compared. Thermal ageing and thermogravimetric analysis of the blends containing high weight ratio of virgin or recycled EPDM suggested higher thermal stability of the blends by showing higher retained tensile properties as well as shifting initiation of degradation to a higher temperature. Due to the fact that recycled EPDM consists of crosslinking precursor, greater crosslink density was observed when recycled EPDM content was increased. This could be verified from the augmentation of storage modulus (E') as well as the reduction in damping factor (tan delta(max),) when the weight ratio of recycled EPDM was increased. (C) 2013 Elsevier Ltd. All rights reserved.
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