Thermally cleavable surfactants
View Patent ↗Two new surfactant molecules are reported which contain thermally labile Diels-Alder adducts connecting the polar and non-polar sections of each molecule. The two surfactants possess identical non-polar dodecyl tail segments but exhibit different polar headgroups. The surfactants become soluble in water when anionic salts are formed through the deprotonation of the surfactant headgroups by the addition of potassium hydroxide. When either surfactant is exposed to temperature above about 60° C., the retro Diels-Alder reaction occurs, yielding hydrophilic and hydrophobic fragments or the aqueous solutions of the surfactants subsequently exhibit loss of all surface-active behavior.
1. A thermally cleavable Gemini surfactant compound, comprising
a Diels-Alder adduct of a bismaleimide molecule and
a first functionalized furan molecule attached at a first end of the bismaleimide molecule and a second functionalized furan molecule attached at a second end of the bismaleimide molecule, the functionalized furan molecule having one or more polar and non-polar functional groups attached thereto.
2. The compound of claim 1 , wherein the polar functional groups comprise one of an anionic polar group, a polar cationic group, or a nonionic polar group.
3. The compound of claim 2 , wherein the anionic polar group is selected from the list consisting of carboxylic acid salts, amine salts, sulfonic acid salts, sulfosuccinate esters, sulfuric acid ester salts, sulfated polyethylenated alcohols, sulfated triglyceride oils, and phosphoric and polyphosphoric acid esters.
4. The compound of claim 2 , wherein the cationic polar group is selected from the list consisting of quaternary ammonium salts, amine salts, and amine oxides.
5. The compound of claim 2 , wherein the nonionic polar group is selected from the list consisting of polyoxyethylenated alkyl phenols, alcohol ethoxylates, glycols, mercaptans, esters, alkanolamine, tertiary acetylenic glycols, pyrrolidones, alkylglycosides, and zwitterionic groups.
6. The compound of claim 2 , wherein the non-polar functional groups comprise an alkyl group.
7. The compound of claim 6 , wherein the alkyl group is prepared by the addition of a reactive bromine atom distal to the furan molecules and the addition of branched or unbranched alkyl amines having the general formula C n H 2n N(H 3 C) 2 wherein n varies from 6 to about 18.