Microwave-assisted synthesis of cyclodextrin polyurethanes.
Cyclodextrin (CD) has often been incorporated into polyurethanes in order to facilitate its use in encapsulation or removal of organic species for various applications. In this work a microwave-assisted method has been developed to produce polyurethanes consisting of α-, β-, and γ-CD and three common diisocyanates. As compared to conventional heating, this new synthetic method saves energy, significantly reduces reaction time, and gets similar or improved yield. The reaction products have been fully characterized with (13)C, (1)H, and two-dimensional NMR spectroscopy. With suitable stoichiometry of starting CD and diisocyanate, the resulting CD polyurethane is organic-soluble and water-insoluble and is shown to remove Nile red dye and phenol from water. Possible applications include the removal of undesirable materials from process streams, toxic compounds from the environment, and encapsulation of color or fragrance molecules.
National Center for Agricultural Utilization Research, USDA Agricultural Research Service, 1815N. University Street, Peoria, IL, 61604, USA. Electronic address: atanu.biswas@ars.usda.gov.
Atanu
A
Biswas
National Center for Agricultural Utilization Research, USDA Agricultural Research Service, 1815N. University Street, Peoria, IL, 61604, USA.
Michael
M
Appell
National Center for Agricultural Utilization Research, USDA Agricultural Research Service, 1815N. University Street, Peoria, IL, 61604, USA.
Zengshe
Z
Liu
Southern Regional Research Center, USDA Agricultural Research Service, 1100 Robert E. Lee Blvd., New Orleans, LA, 70124, USA. Electronic address: hn.cheng@ars.usda.gov.
H N
HN
Cheng
D060326:Chemistry Techniques, Synthetic; D003505:Cyclodextrins / Q000737:chemistry*; D008872:Microwaves; D011140:Polyurethanes / Q000138:chemical synthesis* / Q000737:chemistry*; D014051:Toluene 2,4-Diisocyanate / Q000737:chemistry
D003505:Cyclodextrins; D011140:Polyurethanes; D014051:Toluene 2,4-Diisocyanate
Cyclodextrin; HDI; MDI; Microwave; NMR; Polyurethane; TDI