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COORDINATION CROSSLINKING OF NITRILE RUBBER FILLED WITH COPPER SULFATE PARTICLES

Polymer Alloy Laboratory, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China

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Xiao-fang Yuan

Polymer Alloy Laboratory, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China

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Wei-hong Guo

Polymer Alloy Laboratory, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China

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, and

Chi-fei Wu

Polymer Alloy Laboratory, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China

Corresponding author.

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Abstract

By incorporating copper sulfate (CuSO₄) particles into acrylonitrile butadiene rubber (NBR) followed by heat pressing, a novel vulcanization method is developed in rubber through the formation of coordination crosslinking. This method totally differs from traditional covalent or non-covalent vulcanization approaches of rubber. No other vulcanizing agent or additional additive is involved in this process. By analyzing the results of DMA, XPS and FT-IR, it is found that the crosslinking of (CuSO₄) particles filled NBR was induced by in situ coordination between nitrogen atoms of nitrile groups (–CN) and copper ions (Cu²⁺) from (CuSO₄). SEM and EDX results revealed the generation of a core ((CuSO₄) solid particle)-shell (adherent NBR) structure, which leads to a result that the crosslinked rubber has excellent mechanical properties. Moreover, poly(vinyl chloride) (PVC) and liquid acrylonitrile-butadiene rubber (LNBR) were used as mobilizer to improve the coordination crosslinking of (CuSO₄)/NBR. The addition of PVC or LNBR could lead to higher crosslink density and better mechanical properties of coordination vulcanizates. In addition, crystal water in (CuSO₄) played a positive role to coordination crosslinking of rubber because it decreased the metal point of (CuSO₄) and promoted the metal ionization.

This work was financially supported by the Program of National Natural Science Foundation of China (No. 50473031).

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