Influence of dynamic crosslinking on the morphology,crystallization, and dynamic mechanical properties of PA6,12/EVA blends |
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| Authors: | Fabrício Bondan Juliano Roberto Ernzen Javier Amalvy Ana Vera Machado Johnny De Nardi Martins Otávio Bianchi |
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| Affiliation: | 1. Programa de Pós‐Gradua??o Em Engenharia e Ciência dos Materiais‐PGMAT, Universidade de Caxias do Sul, Caxias Do Sul, Brazil;2. Mantova Indústria de Tubos Plásticos Ltda, Caxias Do Sul, Brazil;3. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Argentina;4. FRLP‐UTN, Centro de Investigación y Desarrollo en Ciencia y Tecnologia de Materiales (CITEMA), La Plata, Argentina;5. Institute for Polymers and Composites, University of Minho, Portugal;6. Campus Blumenau, Universidade Federal de Santa Catarina, Blumenau, Brazil |
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| Abstract: | This study investigated the effect of dynamic crosslinking of polyamide 6,12 and random copolymers of ethylene and vinyl acetate blends (PA6,12/EVA) on the morphology, crystallinity, and dynamic mechanical properties. The crosslinking agent was dicumyl peroxide (DCP), and the blends were processed in a torque rheometer. The morphology depended on the DCP content, and all blends exhibited the same crystallinity index. However, with increasing crosslinking degree, the interfacial tackiness (E) values increased from 1.8 to 2.7 nm. The lamellar structures of all blends started forming at approximately 160 °C, close to the temperature of pure polyamide. The crosslinked phase enhanced the pseudo‐elastic behavior of the blends and increased their molecular mobility activation energy. Samples with higher crosslinking degree exhibited smaller permanent deformation (0.01%) than those with low crosslinking. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44206. |
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| Keywords: | elastomers polyamides structure‐property relations synthesis and processing thermoplastics |
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