Synergism in properties of ionomeric polyblends based on zinc salts of carboxylated nitrile rubber and poly(ethylene-co-acrylic acid)

Bioinspired Engineering towards Tailoring Advanced Lignin/Rubber Elastomers

“…The characteristic peak at 1594 cm −1 assigned to the aromatic skeletal vibrations in lignin shifted to 1587 cm −1 with an increasing content of Zn 2+ , indicating the possible coordination of Zn 2+ with the phenoxy groups on the aromatic rings of lignin. It might also be induced by the asymmetric stretching of the carboxylate coordinated with Zn 2+ [21]. At a higher Zn 2+ content, the peak at 1649 cm −1 intensified, which further confirmed the complexation of Zn 2+ with carboxylate groups [17].…”

“…The absorption peaks at 1451 and 1436 cm −1 were assigned to the C–H stretching deformation in methyl or methylene groups and aromatic rings. Compared with the sample C40S1.5, L40S1.5 exhibited a stronger absorption at 1538 cm −1 , which was assigned to the asymmetric stretching of the metal carboxylate ion formed by the complexation of a zinc cation with carboxyl groups in lignin [21]. Here the zinc cation came from the reaction of zinc oxide and stearic acid that were used as the accelerator in rubber formulations.…”

Ionic elastomers based on carboxylated nitrile rubber (XNBR) and zinc peroxide: Influence of carboxylic group content on properties

“…The main differences between them are found in the region 1300–1800 cm −1 . These correspond to disappearance of the bands at 1700 cm −1 , assigned to H‐bonded COOH, and at 1730 cm −1 , assigned to the CO of free carboxyl groups,9 and appearance of the bands at 1590 cm −1 and 1540 cm −1 , attributed to the asymmetric stretching of the metal carboxylate ion 10. Appearance of the doublet in this region results from the generation of different types of zinc carboxylated coordinated structures;11 the band at 1590 cm −1 is assigned to the tetrahedral structure of the zinc carboxylated ion, and the band at 1540 cm −1 is due to the octahedral structure of the zinc carboxylated ion10, 12 or to a hexacoordinated zinc carboxylate multiplet 9.…”

Coordination cross-linking gadolinium salt/acrylonitrile-butadiene rubber composite: Its preparation, characterization, and functional properties

“…The simple physical mixing of rubber and fillers can improve the mechanical properties of rubber . Strong links exist between rubber chains and reinforcing fillers . In these systems, fillers not only improve the mechanical properties but also provide novel properties when special fillers are selected.…”