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Reactive processing of ethylene-vinyl acetate rubber/polyamide blends via a dynamic transesterification reaction

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Wu, Wenjing, Wan, Chaoying, Wang, Shifeng and Zhang, Yong (2014) Reactive processing of ethylene-vinyl acetate rubber/polyamide blends via a dynamic transesterification reaction. Polymer Bulletin, Volume 71 (Number 6). pp. 1505-1521. doi:10.1007/s00289-014-1138-x

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Official URL: http://dx.doi.org/10.1007/s00289-014-1138-x

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Abstract

Dynamic vulcanization process of ethylene-vinyl acetate rubber (EVM) and ternary polyamide copolymer (tPA) blends in the presence of tetraethyloxysilane (TEOS) was investigated. The morphology, crosslink density and mechanical properties of the resultant EVM/tPA thermoplastic elastomers (TPEs) were characterized. The dynamically crosslinked EVM phase was distributed homogeneously in the continuous tPA phase for the EVM/tPA (70/30) TPE, and the phase size of EVM decreased further as the TEOS content increased. The crosslink density reached 3.17 × 10−5 mol cm−3, and the tensile strength and the elongation at break were up to 10.6 MPa and 296 %, respectively, when the TEOS content was increased to 8 phr, and the heat oil resistance was accordingly enhanced. As compared to dicumyl peroxide-initiated crosslinking reaction of EVM, the crosslinking reaction of EVM through the transesterification reaction between EVM and TEOS presented lower crosslinking rate constant and activation energy, indicating that the transesterification reaction is more suitable for high temperature dynamic vulcanization processing. The optimized dynamic vulcanization process of EVM/tPA TPEs is useful for developing high-performance TPEs for automotive applications.

Item Type: Journal Article
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title: Polymer Bulletin
Publisher: Springer
ISSN: 0170-0839
Official Date: June 2014
Dates:
DateEvent
June 2014Published
10 April 2014Available
23 March 2014Accepted
23 December 2013Submitted
Volume: Volume 71
Number: Number 6
Page Range: pp. 1505-1521
DOI: 10.1007/s00289-014-1138-x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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