Citation: Sheng Wang, Zheng-Hai Tang, Jing Huang, Bao-Chun Guo. Effects of Binding Energy of Bioinspired Sacrificial Bond on Mechanical Performance of cis-1,4-Polyisoprene with Dual-crosslink[J]. Chinese Journal of Polymer Science, ;2018, 36(9): 1055-1062. doi: 10.1007/s10118-018-2131-x shu

Effects of Binding Energy of Bioinspired Sacrificial Bond on Mechanical Performance of cis-1,4-Polyisoprene with Dual-crosslink

Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510641, China

Corresponding author: Bao-Chun Guo, psbcguo@scut.edu.cn
Received Date: 19 December 2017
Revised Date: 21 February 2018
Accepted Date: 21 February 2018
Available Online: 4 April 2018

Although bioinspired sacrificial bonds have been demonstrated to be efficient in improving the mechanical properties of polymer materials, the effect of binding energy of a specific dynamic bond on the ultimate mechanical performance of a polymer network with dual-crosslink remains unclear. In this contribution, diamine and sulfur curing package are introduced simultaneously into a sulfonated cis-1,4-polyisoprene to create dually-crosslinked cis-1,4-polyisoprene network with sulfonate-aminium ionic bonds as the sacrificial bonds. Three diamines (primary, secondary and tertiary) with the same spacer between the two nitrogen atoms are used to create the ionic bonds with different binding energies. Although the binding energy of ionic bond does not affect the glass transition temperature of cis-1,4-polyisoprene (IR), it exerts definite influences on strain-induced crystallization and mechanical performance. The capabilities of diamine in dissipating energy, promoting strain-induced crystallization and enhancing the mechanical performance are in the same order of secondary diamine > primary diamine > tertiary diamine. The variations in mechanical performances are correlated to the binding energy of the ionic bond, which is determined by p K_a values.
- cis-1,4-Polyisoprene,
- Ionic bond,
- Sacrificial bond,
- Binding energy,
- Strain-induced crystallization
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