Synthesis and Characterization of an Iron-Containing Fatty Acid-Based Ionomer

Table 1

NMR, FT-IR, and SEC analyses of the products obtained from a fatty acid/iron/carbon dioxide/water reaction using procedure A or B.

Sample	Sample description	Proc.	NMR analysis^a	FT-IR analysis	Mn	Mw	DP
R	TOFA	None	Oleic and linoleic fatty acids	Fatty acid	281^b	281^b	1
A1	TOFA : iron : water~1 : 0.5 : 0.01 (CO2 present)	A	Oleic (st), linoleic (md), carboxylate (vw)	Fatty acid, acid carboxylate	280	1320	4.8
A2	TOFA : iron : water~1 : 0.8 : 0.01 (CO2 present)	A	Oleic (st), linoleic (md), carboxylate (0), peaks broadened	Fatty acid, acid carboxylate	450	1250	2.8
A3	TOFA : iron : water~1 : 1 : 0.01 (more CO2 present)	A	Oleic (wk), linoleic (vw), carboxylate (0), peaks broadened even more	Fatty acid, acid carboxylate, metal-carboxylate complex	1090	1580	1.4
B1	TOFA : iron : carbonated water~1 : 0.5 : 0.015	B	Oleic (st), linoleic (md), carboxylate (0), peaks slightly broadened	Fatty acid, acid carboxylate, metal-O bonding	284	914	3.2
B2	TOFA : iron : carbonated water~1 : 0.5 : 0.025	B	Oleic (st), linoleic (md), carboxylate (vw), peaks broadened	Fatty acid, trace carboxylate, metal-O bonding	875	1100	1.3
B3	TOFA : iron : carbonated water~1 : 0.5 : 0.025 (CO2 also bubbled into a mixture)	B	Oleic (st), linoleic (md), carboxylate (w), peaks broadened	Fatty acid, trace carboxylate, metal-O bonding	340	1870	5.6
C1	Linoleic acid : iron : water~1 : 0.5 : 0.01 (CO2 and air present)	A	Finoleic (st), carboxylate (st), some conjugations present due to oxidation	Fatty acid, some metal-carboxylate complexes	1400	2420	1.8

^aRelative abundance of oleic and linoleic acids and carboxylate was estimated as strong (st), medium (md), weak (wk), very weak (vw), and absent (0) from peak heights in the ¹³C NMR spectra. ^bThis is the reference sample; only oleic and linoleic acids are assumed present, with molecular weights of 282 and 280, respectively.