scholarly journals Influence of Modified Epoxy Resins on Peroxide Curing, Mechanical Properties and Adhesion of SBR, NBR and XNBR to Silver Wires. Part I: Application of Monoperoxy Derivative of Epoxy Resin (PO)

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1320
Author(s):  
Joanna Chudzik ◽  
Dariusz M. Bieliński ◽  
Michael Bratychak ◽  
Yuriy Demchuk ◽  
Olena Astakhova ◽  
...  

The research was aimed at checking the effect of monoperoxy derivative of epoxy resin (PO) on the possibility of rubber crosslinking and a subsequent adhesion of the modified rubber to silver wires. Three of the 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 the popular, commercially available Epidian 6 epoxy resin, subjected to the functionalization. An improvement in the adhesion of rubbers to silver wires was observed when using the modified resin. In some cases, an improvement in the mechanical properties of the rubber was observed, especially when the resin was used for crosslinking together with dicumyl peroxide (DCP). Crosslinking synergy between dicumyl peroxide and the modified resin could be observed especially in the case of PO applied for peroxide curing of SBR and NBR.

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1285
Author(s):  
Joanna Chudzik ◽  
Dariusz M. Bieliński ◽  
Michael Bratychak ◽  
Yuriy Demchuk ◽  
Olena Astakhova ◽  
...  

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.


Author(s):  
István Zoltán Halász ◽  
Tamás Bárány

In this work the effect of cyclic butylene terephthalate (CBT) was studied on the curing, rheological, morphological and mechanical properties of styrene butadiene rubber (SBR), oil extended styrene butadiene rubber (oSBR), acrylonitrile butadiene rubbers (NBR) with various acrylonitrile (AN) content and a carboxylated acrylonitrile butadiene rubber (XNBR). The effect of CBT on the oil resistance of the NBR and XNBR based compounds was also investigated. Viscosities of the uncured compounds were significantly decreased by CBT and it also acted as a semi-active filler, effectively reinforcing the tested rubbers, therefore it is suggested to be a bifunctional additive for tested rubbers. CBT also showed to have a positive effect on the oil resistance of NBR compounds.


Author(s):  
Nguyen Thanh Liem ◽  
Nguyen Huy Tung ◽  
Nguyen Pham Duy Linh ◽  
Banh Trong Phuc ◽  
Nguyen Thi Thuy ◽  
...  

This paper investigates the mechanical and thermal properties of styrene butadiene rubber (SBR) using dicumyl peroxide as curing agent. The results showed that the tear strength of SBR with 2 phr DCP as curing agent increased sharply from 31,7 N/mm to 73,2 N/mm compared to SBR cured with sulfur. The other mechanical properties like tensile strength, elongation at break are unchanged. The accelerators DM/TMTD used by curing of SBR have not only influence on mechanical properties but also on the curing time. Using 0.5-phr trimethylolpropane trimethacrylate (EM 331) also increases the thermal stability of SBR, thermal aging ratio reaches 0.79 from 0.66 comparing with sample without EM 331. Nano silica have good effec for  thermal conductivity coefficient of SBR . At the nano silica content of 3% the thermal conductivity coefficient increases by more than 20.68%, from 0.672 W / m * K of SBR to 0.811 W / m * K of SBR/nano silica composite. This will probably have a good effect on properties of finished product when blending SBR rubber with other types of synthetic rubber which have different vulcanizing properties.


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