Effects of epoxidized natural rubber (ENR‐50) and processing parameters on the properties of NR/EPDM blends using response surface methodology

Abstract

The effects of epoxidized natural rubber (ENR-50) and processing parameters on the properties of natural rubber/ethylene-propylene-diene rubber (NR/EPDM; 70 : 30 phr) blends were studied. The compounds were prepared by melt compounding method. Using response surface methodology of two-level full factorial, the effects of ENR-50 contents (21 : 5 phr; 11 : 10 phr), mixing temperature (21 : 50 C; 11 : 110 C), rotor speed (21 : 40 rpm; 11 : 80 rpm), and mixing time (21 : 5 min; 11 : 9 min) in NR/EPDM blends were evaluated. Cure characteristics and tensile properties were selected as the responses. The significance of factors and its interaction was analyzed using ANOVA and the model's ability to represent the system was confirmed using the constant of determination, R 2 with values above 0.90. It was found that the presence of ENR-50 has the predominant role on the properties of NR/EPDM blends. The addition of ENR-50 significantly improved cure characteristics and tensile strength up to 5.12% and 6.48% compared to neat NR/EPDM blends, respectively. These findings were further supported by swell measurement, differential scanning calorimetry, and scanning electron microscopy.

Effects of poly(ethyleneimine) adsorption on graphene nanoplatelets to the properties of NR/EPDM rubber blend nanocomposites

“…9. The T g is an indirect representation of the heterogeneous nature of polymeric blend [59]. The addition of surface modified and unmodified GNPs nanofiller at 5.00 wt% loading affected the thermal heat flow and shifted the T g to some extent.…”

Microstructure, mechanical, and rheological properties of natural rubber/ethylene propylene diene monomer nanocomposites reinforced by multi‐wall carbon nanotubes

“…However, ethylene propylene diene monomer (EPDM) rubber has saturated hydrocarbon backbones, which impart usually good weathering oxidation and chemical resistance. The blending of EPDM with NR and other diene rubbers has given rise to compounds with good ozone and chemical resistance and reduced compression set . Vulcanized NR/EPDM blend systems have been extensively studied because of their superior performance in tire application like sidewall, as well as a significant improvement in heat and ozone resistance .…”

Effect of treated mica on rheological, cure, mechanical, and dielectric properties of ethylene propylene diene monomer (EPDM)/barium titanate (BaTiO3)/mica

“…So the chemical crosslinks of EPDM increases . In this way, the M H and cure rate of EPDM/BaTiO 3 /SG‐Si6490 composites increases simultaneously …”