Synthesis and characterization of hyperbranched polytriazole via an ‘A2 + B3’ approach based on click chemistry |
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| Authors: | Jianda Xie Lihua Hu Wenfang Shi Xiaoxu Deng Zhuangqi Cao Qishun Shen |
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| Affiliation: | 1. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;2. Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, PR China |
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| Abstract: | BACKGROUND: The ‘A2 + B3’ type of polymerization has been demonstrated to be an alternative route towards hyperbranched polymers. Some highly crosslinked hyperbranched polymers have been prepared via copper(I)‐catalyzed click reactions of multivalent azides and alkynes. To obtain hyperbranched polymers without gelation and develop the A2 + B3 type of polymerization based on click reactions, the specific reaction conditions need to be investigated. RESULTS: In this work, a hyperbranched polytriazole (hb‐PTA) was synthesized through the A2 + B3 approach using a click reaction. 4‐N,N′‐bis(2‐azidoethyl)amino‐4′‐nitroazobenzene and 1,3,5‐tris(alynyloxy)benzene were synthesized for use as the A2 and B3 monomers, respectively. This was a ‘one‐pot’ polymerization carried out using a slow‐addition method. The obtained hb‐PTA was soluble in common organic solvents. The molecular structure was characterized using 1H NMR, Fourier transform infrared and gel permeation chromatography analyses. The degree of branching of hb‐PTA was determined to be around 0.50. CONCLUSION: The hb‐PTA was successfully synthesized via the A2 + B3 approach based on a click reaction. The polymerization conducted in dilute solution adopting slow addition of A2 to B3 resulted in hb‐PTA in the absence of gelation. The obtained hb‐PTA exhibited high thermal stability. Copyright © 2008 Society of Chemical Industry |
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| Keywords: | hyperbranched polytriazole click reaction characterization |
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