From an economical point of view, epoxidation is normally carried out with the NR in its latex state via in situ peracid generated from formic acid and hydrogen peroxide (H2O2) [8]. Moreover, epoxidation has also been executed in an organic solution using m-chloroperoxybenzoic acid (CPBA) in dichloromethane [9]. NR-g-PMMA has been reported to compatibilize with polar materials such as PMMA [10] and cassava starch [11], while ENRs with different epoxide contents have been applied as either a compatibilizer or a surface modifier in various systems such as organoclay-filled NR [12], silica-filled acrylonitrile–butadiene rubber or nitrile rubber [13].