Results
Title

Synthesis, characterization and catalytic application of functionalized polyureas.

Authors

Kumar, Neeraj; Gupta, Pranshu K.; Khilari, Santimoy; Ranganath, Kalluri V. S.

Abstract

Polyureas are an emerging class of materials which have broad potential applications because of their versatility, complex internal structures. Here polyureas are prepared by the reaction of hexamethylene diisocyanate with either aliphatic or aromatic diamines. Multiple characterization techniques revealed that polyurea materials are porous in nature and stable up to 250 ℃. Further, CP TOSS (Cross Polarized Total Sideband Suppression) 13C solid state NMR revealed the formation of polyurea. PXRD showed that some polyureas were crystalline and formed a network structure through hydrogen bonds which served as a cross linker. Their highly insoluble nature in polar and non-polar solvents, layered structure makes them apt heterogeneous catalysts. A higher catalytic performance was detected in Knoevenagel condensation reaction between aromatic aldehyde and malononitrile in the presence of polyurea. A decrease in the catalytic activity was detected in the 7th recycle tentatively due to the adsorption of water molecule.

Subjects

HEXAMETHYLENE diisocyanate; HETEROGENEOUS catalysts; CATALYTIC activity; POLAR solvents; CONDENSATION reactions; DIAMINES; AROMATIC aldehydes; POLYURETHANE elastomers

Publication

Journal of Polymer Research, 2023, Vol 30, Issue 3, p1

ISSN

1022-9760

Publication type

Academic Journal

DOI

10.1007/s10965-023-03492-1