Cure Characteristics, Morphology and Mechanical Properties of Partially Cured NBR Blended with NR

Abstract

This research is aimed to study the effect of partially cured acrylonitrile butadiene styrene rubber (NBR) blended with natural rubber (NR) and vulcanized with sulfur system. The research started with compounding NBR with zinc chloride, ZnCl2 in an internal mixer. The cure characteristic of the NBR compound was investigated using moving die rheometer (MDR). The compound NBR is then blended in NR at 160 °C. The temperature was then lowered to 50 °C before the addition of sulfur cure additives. Cure characteristic of the rubber blends were investigated and found that the increasing of NBR caused shortened in scorch time. Rubber blends morphology was investigated using SEM. NBR was found dispersed in NR phase. The particle size of dispersed NBR was increased with its content. This is due to high viscosity of NBR and hence larger particles will be obtained. The de-bonding at the interface was shown in SEM micrograph. The compound is then filled with fragrance absorbed fumed silica. The fragrance silica was added during milling of NBR and NR. The releasing behavior of fragrance was found dependent upon NBR/NR ratio.

Dynamic mechanical, mechanical and thermal analysis of CPI/NBR blends: effect of blend composition and crosslink density

“…However, sample CPI-25/NBR-75 seems to more compatible morphology than sample CPI-75/NBR-25 as also exhibited by mechanical and thermal properties of these blends. Although CPI/NBR blends have multi-phase morphology [4,5,30] but here NBR has low acrylonitrile content with nearly similar viscosity to CPI which might be responsible for compatibility [31] of both the materials. Thus, morphology studies revealed that CPI/NBR blends are miscible (homogeneous) which is also confirmed by the dynamic mechanical measurements (glass transition temperature) of this article.…”