Synthesis of High-Molecular-Weight Multifunctional Glycerol Polyhydroxyurethanes PHUs

Abstract

Abstract:Glycerol carbonate acrylate is a 5-membered cyclic carbonate synthesized from glycerol that is used as a chemical coupling agent and has proven highly suitable for use in the synthesis of multifunctional polyhydroxyurethanes (PHUs). The multifunctionality of the structure of PHUs is determined by the density of the carbon-amine groups generated by the Aza-Michael reaction and that of the urethane groups and adjacent primary and secondary hydroxyl groups generated by aminolysis. Glycerol carbonate acrylate is polymerized with polyfunctional mono-, di-, tri, and tetra-amines, by type-AB polyaddition, either in bulk or in solution, through stepwise or one-pot reaction strategies in the absence of added catalysts. These approaches result in the generation of linear, interchain, and crosslinked structures, through the polyaddition of linear and branched amines to the ethylene and cyclic carbonate sites of glycerol carbonate acrylate. The resulting collection of organic molecules gives rise to polyethylene amino ester PHUs with a high molar mass, exceeding 20,000 g·mol −1 , with uniform dispersity.

Encapsulation of curcumin into layered double hydroxides improve their anticancer and antiparasitic activity

“…Although CUR is a neutral molecule, protons can be removed with alkalinization. pKa 1, 2 and 3 in curcumin are 7.8, 8.5 and 9.0, [ 33 ] and exhibit an overall hydrophobic nature and the presence of hydrophilic hydroxyl groups originated as a result of keto‐enol tautomerism promotes the intercalation of CUR in the interlayer space of Mg‐LDH‐CUR, while Zn‐LDH‐CUR retains CUR by adsorption among the aggregate of LDH particles. In both cases, retention is promoted by the attraction of the negative charges in CUR and the positive charge in the LDH particles.…”

Synthesis of a new bifunctional molecule based on castor oil and CO2 useful for polyurethanes

“…14 Nohra et al used aza-Michael addition to obtain high molecular weight PHU from glycerol carbonate acrylate and linear and branched amines. 15 The glycerol amino ethylene ester obtained were gels, foams, and resins. In general, for obtain thermosets, acrylates are incorporated as Michael acceptors, using acrylic acid derivatives.…”

“…In general, for obtain thermosets, acrylates are incorporated as Michael acceptors, using acrylic acid derivatives. 15 Maleate groups are more reactive than acrylates due to the presence of two ester groups, which act as withdrawing groups (Michael acceptors). 14,16 In this article, maleate groups were introduced through hydroxyl groups of castor oil using mild conditions.…”

Dielectric Properties of BN-ZnO-GNP Doped PU-EG Composites

“…The unclear peak observed around 1530 cm -1 belongs to the carbon-carbon bond from graphene (Peng et al, 2013). The other two spectrums are the characteristic peaks of ethylene glycol (Nohra et al, 2016) and polyurethane (Caddeo et al, 2015) raw materials. These include the OH bond at approximately 3300 cm -1 and the CH bonds at 2870 and 2942 cm -1 .…”