The reactive compatibilization of NBR/EVA blends with oxazoline-modified nitrile rubber

The reactive compatibilization of ethylene-vinyl acetate copolymer (EVA)/nitrile rubber (NBR) blends has been performed using partially hydrolyzed EVA (EVALVA) in combination with oxazoline-functionalized NBR (NBROX). The synthesis of the NBROX has been performed in solution. The presence of 5 wt% o...

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Bibliographic Details
Published in:European polymer journal 2004-09, Vol.40 (9), p.2185-2194
Main Authors: Soares, Bluma G, Almeida, Mauricio S.M, Guimarães, Pedro I.C
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Mechanical properties
NBR and EVA
Organic polymers
Oxazoline groups
Physicochemistry of polymers
Properties and characterization
Reactive compatibilization
Rubber blends
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Summary:The reactive compatibilization of ethylene-vinyl acetate copolymer (EVA)/nitrile rubber (NBR) blends has been performed using partially hydrolyzed EVA (EVALVA) in combination with oxazoline-functionalized NBR (NBROX). The synthesis of the NBROX has been performed in solution. The presence of 5 wt% of EVALVA in combination with 2.5 wt% of NBROX resulted in a substantial improvement of tensile strength of NBR/EVA (50:50 wt%) vulcanized blends, with a little increase of the elongation at break. The morphologies of these blends were examined by the scanning electron microscopy. A finer morphology has been observed in vulcanized and non-vulcanized blends, compatibilized with the co-reactive EVALVA/NBROX copolymers. Blends of NBROX/EVALVA (50:50 wt%) resulted in insoluble material, constituted by both components, as indicated by Fourier transform infrared analysis. This result indicates the reaction of the co-reactive groups (hydroxyl and oxazoline) during blending.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2004.04.006