Influence of magnesium carbonate loading on the compound properties of polychloroprene, natural rubber, and their blends

✍ Scribed by Pongdhorn Sae-Oui; Chakrit Sirisinha; Kannika Hatthapanit; Nilobon Phewthongin

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 345 KB
• Volume: 110
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.28786

✦ Synopsis

Abstract

The effect of magnesium carbonate (MgCO~3~) loading on the compound properties of polychloroprene (CR), natural rubber (NR), and their blends was investigated. The studied properties included Mooney viscosity, cure characteristics, and degree of filler–filler interaction. In addition to MgCO~3~ loading, the effect of the blend ratio on such properties was simultaneously determined. The results reveal that, regardless of the rubber type and blend ratio, increasing MgCO~3~ loading resulted in not only an increase in the compound viscosity, but also in the enhancements of the cure rate and state of cure. However, the effect of MgCO~3~ loading on the overcured behavior was strongly dependent on the rubber type and blend ratio. For CR, the presence of MgCO~3~ accelerated postcuring, whereas the opposite results were found for NR, in which the reversion rate was promoted. For CR/NR blends, a plateau behavior was obtained at a 50/50 blend ratio, where the degrees of postcuring and reversion were counterbalanced. The results also reveal that when MgCO~3~ was loaded at low concentrations (≤20 phr), the degree of filler–filler interaction was very low and had no significant effect on the compound properties. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008