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

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...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2014-06, Vol.71 (6), p.1505-1521
Main Authors: Wu, Wenjing, Wan, Chaoying, Wang, Shifeng, Zhang, Yong
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemical reactions and properties
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Copolymers
Crosslinking
Crosslinking, vulcanization
Curing
Density
Dicumyl peroxide
Elongation
Ethylene vinyl acetates
Exact sciences and technology
High temperature
Mechanical properties
Microscopy
Morphology
Organic Chemistry
Organic polymers
Original Paper
Physical Chemistry
Physicochemistry of polymers
Polyamide resins
Polymer blends
Polymer Sciences
Reactive processing
Rubber
Soft and Granular Matter
Solvents
Temperature
Tensile strength
Thermoplastic elastomers
Transesterification
Vulcanization
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Summary: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.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-014-1138-x