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Issue 1, 2018
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Synthesis and characterization of isocyanate-free polyureas

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Due to continued health and safety concerns surrounding isocyanates, alternative synthetic routes to obtain urea-containing polymers is gaining much attention. Melt polycondensation of urea with diamines achieved polyureas in the absence of catalyst or solvents. 1H NMR spectroscopy and thermogravimetric analysis confirmed targeted compositions and thermal stability, respectively. Differential scanning calorimetry and dynamic mechanical analysis provided insight into the copolymers’ thermal and morphological behavior. A steady increase in the melting temperature across the range of compositions suggested co-crystallization of the different repeating units, in sharp contrast to non-hydrogen bonded copolymers. Furthermore, tunable melt temperatures and mechanical performance illustrated the versatility of these copolymers in high performance applications. Finally, initial biodegradation studies using a naturally occurring, soil enzyme (urease) demonstrated steady degradation over 4 weeks, releasing ammonia as a potential nitrogen source for agricultural applications.

Graphical abstract: Synthesis and characterization of isocyanate-free polyureas

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The article was received on 04 Oct 2017, accepted on 29 Nov 2017 and first published on 29 Nov 2017

Article type: Paper
DOI: 10.1039/C7GC02996A
Citation: Green Chem., 2018,20, 243-249
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    Synthesis and characterization of isocyanate-free polyureas

    J. M. Dennis, L. I. Steinberg, A. M. Pekkanen, J. Maiz, M. Hegde, A. J. Müller and T. E. Long, Green Chem., 2018, 20, 243
    DOI: 10.1039/C7GC02996A

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