High-temperature polyurea greases

Nikishina, Z. M.; Butovets, V. V.; Lendel, Iryna; Strashenko, M. Ya.

doi:10.1007/bf00731816

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polyureas have some special properties, like hydrolysis resistance, 1 excellent mechanical properties 2,3 and anti-corrosion 4,5 and thus they have wide applications in coatings, 6 greases [7][8][9] and microcapsules. 10,11 As we know, traditional polyureas are usually produced based on the reaction of a diamine with isocyanates, [12][13][14] urea, [15][16][17] and diphenyl carbonate.…”

Section: Introductionmentioning

confidence: 99%

Utilization of carbon dioxide to build a basic block for polymeric materials: an isocyanate-free route to synthesize a soluble oligourea

Zhao

Zhang

et al. 2015

RSC Adv.

View full text Add to dashboard Cite

A water soluble oligourea was synthesized by an isocyanate-free route from carbon dioxide and diamine in the absence of any organic solvents or additives. The chemical structure of the product was confirmed by FTIR and 13 C NMR analysis, and the average molecular weight was estimated with MALDI-TOF MS. The weight average molecular weight of the obtained oligourea is about 2210 Da reacting under 180 C and 11 MPa for 12 h. Moreover, the prepared oligourea has a moderate thermo-stability, it has an initial decomposition temperature at $220 C and a melting temperature of 110 C, as confirmed by TGA and DSC. As a soluble oligomer, it could be used as a building block to synthesize CO 2 -based polymeric materials due to it possessing a chemically active amino end group. For example, foaming plastics, greases, spun fibers and high strength polymer materials may be fabricated by reaction of the oligomer with a chain extender like a diisocyanate, diester or diacid.

show abstract