Abstract
This research was aimed at verifying the effect of carboxy-containing peroxy oligomer (CPO) addition on the possibility of rubber crosslinking and a subsequent adhesion of the modified rubber to silver wires. Three commonly industrially used rubbers were selected for the study: styrene–butadiene rubber (SBR), acrylonitrile–butadiene rubber (NBR) and carboxylated acrylonitrile–butadiene rubber (XNBR), together with carboxy-containing peroxy oligomer (CPO). An improvement in the adhesion of rubbers to silver wires was observed when applying the oligomeric peroxide with functional groups, with no deterioration of mechanical properties of the vulcanizates. Crosslinking synergy between dicumyl peroxide (DCP) and the modifier could hardly be observed. Nevertheless, the studies demonstrated, that to a small extent, even the CPO itself can crosslink NBR and especially XNBR, resulting in a material of notable elasticity and adhesion to silver wires.
Highlights
The current state of knowledge on how to improve adhesion between polymer and metals was described in the first part of our work [1]
Adding containing peroxy oligomer (CPO) to XNBR had the smallest effect on torque increase, despite carboxyl groups being present in the rubber structure
The situation changes if CPO is used as a coagent of peroxide crosslinking in the presence of dicumyl peroxide (DCP)
Summary
The current state of knowledge on how to improve adhesion between polymer and metals was described in the first part of our work [1]. The aim of the study was similar—to determine the effect, this time of CPO addition, on the mechanical properties of selected synthetic rubbers and their adhesion to silver. Silver wires were selected as a tester to check the pro-adhesive potential of the resin towards some important technical rubbers: styrene– butadiene (SBR), acrylonitrile–butadiene (NBR) and carboxylated acrylonitrile–butadiene (XNBR). Experiments performed with macroscopic silver wire allow verifying the ability of CPO resin to improve adhesion between silver nanowires (AgNW) and rubber matrix in future rubber nanocomposites. Apart from the effect on interphase interactions, an addition of the resin is likely to modify crosslinks density and the structure of peroxide-cured rubber vulcanizates [1]. As discussed in the first part of our publication, such modification can be potentially beneficial in terms of the mechanical properties of rubber/AgNW nanocomposites, their adhesion and conducting behavior
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