Citation: Li-jie Zhang, Jing Huang, Si-wu Wu, Zheng-hai Tang, Bao-chun Guo. Reinforcing Styrene-Butadiene Rubber with Deformable Domains and Related Mechanisms[J]. Acta Polymerica Sinica, ;2020, 51(2): 198-204. doi: 10.11777/j.issn1000-3304.2019.19135 shu

Reinforcing Styrene-Butadiene Rubber with Deformable Domains and Related Mechanisms

Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640

Corresponding author: Bao-chun Guo, psbcguo@scut.edu.cn
Received Date: 12 July 2019
Revised Date: 28 July 2019

In the present work, based on the coordination capability of nitrile groups in nitrile rubber (NBR) with metal ions, a novel type of rubber material with sacrificial domains was designed. Specifically, copper sulfate (CuSO₄) and vulcanization package were introduced into styrene-butadiene rubber (SBR)/NBR blend by mechanical mixing and hot pressing. As a result, SBR with sulfur crosslinkings are formed as continous phases while the NBR mainly crosslinked by Cu(II)-nitrile coordination bonds are acted as dispersed phases, which are used as deformable domains to reinforce SBR. With the increasing concentration of coordination bonds in dispersed phase, both strength and modulus of the rubber improve rapidly. When 20 wt% NBR was introduced, the strength and modulus of SBR are increased by 2.6-fold and 3.2-fold, respectively. The significant reinforcing effect of this system is attributed to the strong yet deformable domains. The strong domains have hydrodynamic effect, which greatly improve the moduli of the samples. On the other hand, upon external stress, the loading can be rapidly transferred from SBR matrix to the domains owning to strong interfacial interactions, forcing the domains to develop high-elastic deformation prior to the rupture of SBR chains and dissipate mechanical energy, thus significantly enhancing the toughness of the rubber. This forced high-elastic deformation in domains can be recoverd through relaxation at a high temperature to fully restore the mechanical properties. Overall, this work provides a new way for the reinforcement of non-polar rubber through the design of deformable domains.
- Non-polar rubber,
- Deformable domains,
- Coordination bond,
- Reinforcement
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