Shape memory polytriazole elastomers from aromatic monomers: Synthesis and properties

Ramdas, M. Ragin and Vijayalakshmi, K. P. and Munirathnamma, L. M. and Ravikumar, H. B. and Santhosh Kumar, K. S. (2018) Shape memory polytriazole elastomers from aromatic monomers: Synthesis and properties. Materials Today Communications, 17. 180 - 186.

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In this contribution, a shape memory elastomer is synthesized from aromatic monomers by using copper catalyzed azide-alkyne polycycloaddition reaction (CuAAC). An aromatic trifunctional azide (M1) on click reaction with an aromatic trifunctional propargyl monomer (phloroglucinol based, M3) resulted in the formation of elastomeric shape memory polymer (E-SMP) with trigger temperature (Ttrig) of 35 °C. Interestingly, a bifunctional monomer (propargyl quinol, M2) on click cross-linking with M1 led to a polytriazole thermoset (NE-SMP) with Ttrig of 92 °C. Both E-SMP and NE-SMP possess gel content > 97. The unprecedented formation of E-SMP is attributed to its high free volume as experimentally evidenced from PALS study. In computational modeling, it is evidenced that the triazole units in each phenyl ring are interacting to one another to create vacant spaces in the cross-linked polymer. The pore diameter is about 1 nm in E-SMP and 0.5 nm in NE-SMP. The triazole units undergo H-bonding with each other which facilitate the folding of polymer chains (and pores). The E-SMP exhibited fast shape recovery (12 s) whereas NE-SMP required 40 s. The E-SMP is thermally stable up to 260 °C (T 5).

Item Type: Article
Uncontrolled Keywords: Click reaction, Shape memory, Polytriazole elastomer, Chain coiling
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: Manjula P Library Assistant
Date Deposited: 02 Jul 2019 11:06
Last Modified: 02 Jul 2019 11:06

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