Epoxidized natural rubber/acid functionalized carbon nanotubes composites for enhanced thermo‐mechanical and oxygen barrier performance

Abstract

Herein, acid functionalized carbon nanotubes (FCNTs) reinforced epoxidized natural rubber (ENR 25) composites with 25% epoxidation are studied with particular reference to the effect of FCNTs on microstructural development along with their effect on thermo-mechanical and gas barrier properties. Excellent improvement in tensile strength, that is, 128% and 118%, was observed with the addition 1 and 2 wt% of FCNTs, respectively, without compromising the elongation at break. A 76% improvement in oxygen impermeability was found for 2 wt% of FCNTs. Chemical interactions among FCNTs and ENR 25 altered the composite morphology and led to good dispersion, both of which contribute to the excellent thermo-mechanical and gas barrier properties of the composites. The distribution of the filler inside ENR 25 has been characterized with scanning electron microscopy, which unveiled segregated FCNTs. The obtained experimental gas permeability values were correlated with the well-known Bharadwaj model. The fabricated functional composites could find applications in automobiles, packaging, and other demanding engineering sectors.

Intercalation of silsesquioxane surfactant in layered double hydroxide for silicone rubber composites: Enhancing interfacial interactions toward improvement of mechanical, thermal, and gas barrier properties

“…Furthermore, the SR/LDH‐SQ‐60 had the lowest gas transmission rate, which may be due to the fact that the interlayer spacing of the LDH‐SQ‐60 reached 2.16 nm, allowing the polymer chains to be intercalated between the layers. This resulted in LDH‐SQ‐60 being uniformly dispersed in the SR and being exfoliated into fewer layers, thus reducing the gas transmission 56 . In Figure 9B, the gas permeability of SR/Ca‐Mg‐Al LDH composites was reduced by 9.4% after stretching in comparison with before stretching.…”

“…This resulted in LDH-SQ-60 being uniformly dispersed in the SR and being exfoliated into fewer layers, thus reducing the gas transmission. 56 In Figure 9B, the gas permeability of SR/Ca-Mg-Al LDH composites was reduced by 9.4% after stretching in comparison with before stretching. It was attributed to the shear-induced orientation of Ca-Mg-Al LDH in the SR matrix, which hindered the initial diffusion direction and formed more tortuous penetration pathways for the CO 2 molecules.…”

Design and Characterization of High Gas Barrier and Fully Biobased Poly(1,5-pentylene succinate-co-itaconate-co-furanoate) Elastomers

“…4 However, most diene based pristine rubbers exhibit high permeability to air because of their large fractional free volume, which has been used to determine the gas permeability in polymers chains. 5 Thus, the gas barrier of various generic rubbers ranges from inferior to superior, with natural rubber, 6 epoxy natural rubber, 7 styrene butadiene rubber 8 and nitrile rubber 9 being notable examples. Among those, butyl rubber or halogenated butyl rubber, which are obtained by cationic polymerization of isobutylene and a small amount of isoprene, has the best barrier properties.…”

The Synergistic Effect of Carbon Black/Carbon Nanotube Hybrid Fillers on the Physical and Mechanical Properties of EPDM Composites after Exposure to High-Pressure Hydrogen Gas

“…In the field of hybrid systems based on CB and nanoparticles, carbon nanotubes (CNTs) are regarded as representative nanoparticles that are compatible with CB. CNTs exhibit high mechanical strength, electrical, thermal, and barrier properties, attributed to their high aspect ratio, and they thus offer efficient reinforcement for composites [ 12 , 13 , 14 ]. Furthermore, CNTs can achieve comparable properties with significantly lower carbon nanotube contents compared to high carbon black contents [ 15 ].…”