Citation: Jia Liu, Xiao-ning Ma, Mei-dong Lang. Synthesis and Characterization of Dynamic Covalent Polymers Based on Ditelluride Bonds[J]. Acta Polymerica Sinica, ;2018, 0(12): 1514-1523. doi: 10.11777/j.issn1000-3304.2018.18133 shu

Synthesis and Characterization of Dynamic Covalent Polymers Based on Ditelluride Bonds

Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237

Corresponding author: Mei-dong Lang, mdlang@ecust.edu.cn
Received Date: 29 May 2018
Revised Date: 15 June 2018
Available Online: 19 July 2018

Dynamic covalent polymers that inherit the reversibility and robustness of dynamic covalent bonds have attracted considerable attention in terms of self-healing, stimuli-responsiveness, and recyclability. However, most of them require an external stimulus to induce their dynamic properties, which may limit their application. Here, two dynamic covalent polymers based on ditelluride bonds were prepared, which were free of external conditions. First, a novel stable ditelluride-containing compound, di-(1-hydroxypropyl) ditelluride ((HOC₃H₆Te)₂) was synthesized. Then, two ditelluride-containing polymers, polycaprolactone (PCLTe)₂ and poly(1,3-trimethylene carbonate) (PTMCTe)₂ were synthesized via the enzymatic ring-opening polymerization using (HOC₃H₆Te)₂ as the initiator and Novozym 435 as the catalyst. The structures of (PCLTe)₂ and (PTMCTe)₂ were verified by ¹H-NMR and ¹²⁵Te-NMR. The dynamic properties of the ditelluride-containing polymers were investigated using (PCLTe)₂ and (PTMCTe)₂ as the model polymers and confirmed by ¹H-NMR, ¹³C-NMR and ¹²⁵Te-NMR spectra. The results indicated that the ditelluride exchange between (PCLTe)₂ and diphenyl ditelluride ((PhTe)₂) could occur spontaneously in the dark at room temperature without any external stimuli and the equilibrium of the reaction could be reached immediately. The dynamic exchange between (PCLTe)₂ and (PTMCTe)₂ was confirmed by ¹²⁵Te-NMR spectrum and MALDI-TOF mass, which could occur spontaneously without any external stimuli. The results of MALDI-TOF mass showed that a di-block polymer (PTMCTeTePCL) was formed during the exchange process. The tensile test results indicated that the tensile strength and the elongation of PCL/PTMC composite were 3.07 MPa and 38.26%, respectively. However, as for (PCLTe)₂/(PTMCTe)₂ composite, the tensile strength and the elongation were increased to 5.22 MPa and 80.51%, respectively. The scanning electron microscopy images showed that the compatibility between (PCLTe)₂ and (PTMCTe)₂ was significantly improved comparing with the PCL/PTMC composite. The results indicated that the ditelluride exchange had a great effect on the properties of (PCLTe)₂/(PTMCTe)₂ composite. This study developed the ditelluride-related dynamic chemistry and promoted the application of dynamic covalent polymers.
- Ditelluride bonds,
- Dynamic covalent polymer,
- Enzymatic polymerization,
- Di-block polymer
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