Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 26, Pages 9498-9505Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm10921a
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Funding
- United Soybean Board
- Kansas Soybean Commission
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The polymerization pathways of epoxidized and hydroxylated triglycerides with phosphoric acid (H(3)PO(4)) were investigated using model reactions. Involved epoxides and diols were derived from oleic acid methyl ester, which was easily monitored by one- and two-dimensional nuclear magnetic resonance (NMR) techniques as well as electrospray ionization mass spectroscopy (ESI-MS). Phosphoric acid played two key functions: (a) as a Bronsted acid catalyst that activated the epoxide toward nucleophilic attack by the diol, thus generating ether (C-O-C) cross-linkages; and (b) as a reaction partner establishing phosphate ester linkages [(RO)(2)(O)P-O-C, R = C or H]. In studies with (18)O labeled diol, phosphate esters formed exclusively from H(3)PO(4) and epoxide without incorporation of diol whereas diols acted as polymerization initiators in polyether formations.
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