NMR Analyses of Two Polyether Modified Organic Silicone Surfactants

doi:10.11938/cjmr20160308

Abstract

Abstract:

Two unknown polyether modified organic silicone surfactants were studied by NMR techniques (i.e., ¹H NMR, DEPT135, ¹³C qNMR, ¹H-¹H COSY, ¹H-¹³C HSQC, ¹H-¹³C HMBC, ²⁹Si qNMR and ¹H-²⁹Si HMBC). The NMR signals were assigned. The results indicated that the two silicone surfactants could be distinguished from each other by ¹H-²⁹Si HMBC. The main component of sample A was polyethylene oxide modified polydimethylsiloxane surfactant with a linear ABA structure, and sample B had a comb BAB structure. The average molecular weight of the two compounds was 1 967 and 7 191, respectively.

Key words: liquid NMR, structural elucidation, ¹H-²⁹Si HMBC, silicone surfactants, siloxane polyalkyleneoxide copolymer

CLC Number:

O482.53

ZHANG Bin-feng, ZHU Xue-rong. NMR Analyses of Two Polyether Modified Organic Silicone Surfactants[J]. Chinese Journal of Magnetic Resonance, 2016, 33(3): 432-441.

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