| Autor: |
Oliveira, Marcia G., Soares, Bluma G., Santos, Cláudia M. F., Diniz, Milton F., Dutra, Rita C. L. |
| Zdroj: |
Macromolecular Rapid Communications; October 1999, Vol. 20 Issue: 10 p526-531, 6p |
| Abstrakt: |
Ethylene‐propylene‐diene rubber (EPDM) was reacted with thioacetic acid in the presence of 2,2′‐azoisobutyronitrile (AIBN), giving rise to thioacetate‐modified EPDM (EPDMTA). The extent of the incorporation was studied as a function of both thioacetic acid and AIBN concentration and reaction time. The products were analyzed by FTIR spectroscopy, sulfur content, and 1H NMR spectroscopy. The hydrolysis of EPDMTA in a NaOH methanolic solution resulted in mercapto‐modified EPDM (EPDMSH). The addition of 5 wt.‐% of this functionalized copolymer to a sulfur‐vulcanized nitrile rubber (NBR)/EPDM (70 : 30 wt.‐%) blend accelerated the vulcanization process as indicated by oscillating disk rheometer analysis. In addition, an improvement of mechanical and ageing properties was also observed. |
| Databáze: |
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