Synthesis and characterization of isocyanate-free polyureas

Joseph M. Dennis, Limor I. Steinberg, Allison M. Pekkanen, Jon Maiz, Maruti Hegde, Alejandro J. Müller, Timothy Edward Long

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalGreen Chemistry
Volume20
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1
Externally publishedYes

Fingerprint

Isocyanates
urea
Copolymers
melt
agricultural application
Urea
calorimetry
health and safety
nuclear magnetic resonance
biodegradation
crystallization
Diamines
ammonia
Urease
polymer
melting
temperature
catalyst
spectroscopy
Dynamic mechanical analysis

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Dennis, J. M., Steinberg, L. I., Pekkanen, A. M., Maiz, J., Hegde, M., Müller, A. J., & Long, T. E. (2018). Synthesis and characterization of isocyanate-free polyureas. Green Chemistry, 20(1), 243-249. https://doi.org/10.1039/c7gc02996a

Synthesis and characterization of isocyanate-free polyureas. / Dennis, Joseph M.; Steinberg, Limor I.; Pekkanen, Allison M.; Maiz, Jon; Hegde, Maruti; Müller, Alejandro J.; Long, Timothy Edward.

In: Green Chemistry, Vol. 20, No. 1, 01.01.2018, p. 243-249.

Research output: Contribution to journalArticle

Dennis, JM, Steinberg, LI, Pekkanen, AM, Maiz, J, Hegde, M, Müller, AJ & Long, TE 2018, 'Synthesis and characterization of isocyanate-free polyureas', Green Chemistry, vol. 20, no. 1, pp. 243-249. https://doi.org/10.1039/c7gc02996a
Dennis JM, Steinberg LI, Pekkanen AM, Maiz J, Hegde M, Müller AJ et al. Synthesis and characterization of isocyanate-free polyureas. Green Chemistry. 2018 Jan 1;20(1):243-249. https://doi.org/10.1039/c7gc02996a
Dennis, Joseph M. ; Steinberg, Limor I. ; Pekkanen, Allison M. ; Maiz, Jon ; Hegde, Maruti ; Müller, Alejandro J. ; Long, Timothy Edward. / Synthesis and characterization of isocyanate-free polyureas. In: Green Chemistry. 2018 ; Vol. 20, No. 1. pp. 243-249.
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