Issue 2, 2012

Polyureas from diamines and carbon dioxide: synthesis, structures and properties

Abstract

Polyureas were synthesized from diamines and carbon dioxide in the absence of any catalyst or solvent, analogous to the synthesis of urea from condensation of ammonia with carbon dioxide. The method used carbon dioxide as a carbonyl source to substitute highly toxic isocyanates for the synthesis of polyureas. FTIR and DFT calculations confirmed that strong bidentate hydrogen bonds were formed between urea motifs, and XRD patterns showed that the PUas were highly crystalline and formed a network structure through hydrogen bonds, which served as physical cross-links. The long chain PUas presented a microphase separated morphology as characterized by SAXS and showed a high melting temperature above 200 °C. The PUas showed high resistance to solvents and excellent thermal stability, which benefitted from their special network structures. The PUas synthesized by this method are a new kind of functional material and could serve some areas where their analogues with similar functional groups could not be applied.

Graphical abstract: Polyureas from diamines and carbon dioxide: synthesis, structures and properties

Supplementary files

Article information

Article type
Communication
Submitted
21 Oct 2011
Accepted
03 Nov 2011
First published
17 Nov 2011

Phys. Chem. Chem. Phys., 2012,14, 464-468

Polyureas from diamines and carbon dioxide: synthesis, structures and properties

C. Wu, J. Wang, P. Chang, H. Cheng, Y. Yu, Z. Wu, D. Dong and F. Zhao, Phys. Chem. Chem. Phys., 2012, 14, 464 DOI: 10.1039/C1CP23332G

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