Evolution of the Nanostructure and Viscoelastic Properties of Nitrile Rubber upon Mechanical Rejuvenation and Physical Aging

Abstract

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Ionic Conductivity, Salt Partitioning, and Phase Separation in High-Dielectric Contrast Polyether Blends and Block Polymer Electrolytes

“…19,28,29,50−55 The strong dipole−dipole attractions between the cyano functional groups in PCEGE and P(CEGE-co-nBGE) results in strong polymer−polymer interactions, similar to conventional polymers like poly-(acrylonitrile-co-butadiene). 56 Consequently, the T g s of −37 and −56 °C, respectively, for PCEGE and P(CEGE-co-nBGE) were much higher than that of PAGE (−78 °C). Upon dissolving LiTFSI into the polymers, the T g of the polymer electrolytes increased relative to the pure-polymer T g s.…”

“…The glass transition temperature ( T g ) is another important property that significantly affects the ionic conductivities of polymer electrolytes. ,,,− The strong dipole–dipole attractions between the cyano functional groups in PCEGE and P­(CEGE- co -nBGE) results in strong polymer–polymer interactions, similar to conventional polymers like poly­(acrylonitrile- co -butadiene) . Consequently, the T g s of −37 and −56 °C, respectively, for PCEGE and P­(CEGE- co -nBGE) were much higher than that of PAGE (−78 °C).…”

Self-adhesion of uncrosslinked poly(butadiene-co-acrylonitrile), i.e. nitrile rubber, an inhomogeneous and associative polymer

“…(C) X-ray scattering profiles illustrate the broadening of the high-order peaks at q/q* = 2 and q/q* = 3, supporting this picture. Details on the nanostructure are discussed in Hervio et al 1 We suggest two plausible explanations for this behaviour. The first one relates to the dynamics of the inhomogeneous and associative polymers.…”

“…11 We recently shed some light on the dynamics of uncrosslinked and industrial-grade NBR, demonstrating that it can be mechanically rejuvenated and physically aged due to an inhomogeneous distribution of acrylonitrile and butadiene monomers along the polymer chains. 1 Namely, uncrosslinked NBR is constituted of blocks of poly(butadiene) and poly(acrylonitrilealt-butadiene) as a result of the difference in reactivity ratios between acrylonitrile and butadiene during emulsion copolymerisation. Such inhomogeneous distribution of monomers along the polymer chains results in thermodynamic driving forces for microphase separation and kinetic barriers for thermal-and solvent-processing like those of block copolymers; [12][13][14][15][16][17] a behaviour that contrasts that of compositionally homogeneous copolymers like SBR.…”

Enhanced Mechanical Properties of Natural Rubber by Block Copolymer-Based Porous Carbon Fibers

“…Rubber and rubber composites − are important macromolecular materials used in a range of applications from less demanding gloves, hoses, gaskets, and mats to highly taxing applications such as industrial conveyor belts and tires, owing to their good abrasion resistance, mechanical properties, and dynamic behavior. − Silica and carbon black (CB) are the two most commonly used fillers to reinforce the properties of rubber. Silica is mainly used in the tire tread formulation to decrease the hysteresis of tread compounds for passenger tires .…”