Curing and barrier properties of NBR/organo‐clay nanocomposite

Abstract

Organo-montmorillonite/NBR nanocomposites were prepared by a melt intercalation process. The characteristics of NBR nanocomposites were characterized by oscillating-disk rheometer, watervapour transmission and transmission electron microscopy (TEM). Changes in cure characteristics resulting from changes in clay content and the addition of silane coupling agent were investigated. The study confirmed that organo-montmorillonite/NBR nanocomposites cure characteristics, viz minimum torque, maximum torque, scorch time and curing time, change according to the change in clay content and the addition of silane coupling agent. Of the water-vapour transport properties, the clay content and silane content are the dominating factors in determining the individual water-vapour permeability of these NBR nanocomposites. TEM analysis provided clear evidence for the homogeneous dispersion of clay in the NBR matrix without regard to increases in clay content.

Effects of heat and pressure on intercalation structures of isobutylene‐isoprene rubber/clay nanocomposites. I. Prepared by melt blending

“…Very recently, increasing attention has been paid on rubber/clay nanocomposites (RCNs). RCNs based on elastomers, such as carboxylated nitrile–butadiene rubber (CNBR), nitrile–butadiene rubber (NBR), nature rubber (NR), styrene–butadiene rubber (SBR), ethylene–propylene–diene monomer (EPDM), and silicon rubber (SiR), were prepared via solution intercalation, melt intercalation, and rubber latex compounding 4–14. Different from thermoplastic PCNs, RCNs need a curing process following nano‐compounding of rubbers and clay so as to obtain the cross‐linked composites.…”

Mechanical, thermal and transport properties of nitrile rubber (NBR)—nanoclay composites

“…Exfoliation of clay improves the barrier characteristics of polymers by providing tortuous path for the diffusion of gas [27]. The dispersion and exfoliation of the nanoclay platelets increased the path length required to transport the permeating molecule through the rubber matrix thereby decreasing the rate of transport [38]. At higher nanoclay contents, the lengths of the tortuous path decreased due to formation of aggregates and lesser extend of exfoliation resulting in increased gas permeation rate through the composites.…”

Chemical and bonding effects of exposing uncured PBI‐NBR insulation to ambient conditions

“…In PBI‐NBR, tallow amine is used as the surfactant for an organo‐montmorillonite nanoclay ingredient, which facilitates NBR polymer intercalation between the clay platelets. Extensive research on the preparation and structural benefits of NBR nanoclay reinforcement has been performed and the effect on cure characteristics has been documented . Surfactant treated clays have also been used as an anti‐tack release agent on uncured rubber .…”