Simultaneous monitoring of epoxy value, hydroxyl value, and polymeric hydroxyl value during the ring opening of epoxidized soybean oils based on low‐field nuclear magnetic resonance coupled with chemometrics
Fengdan Yan,
Wenlong Li,
Zihan Ye
et al.
Abstract:Low‐field nuclear magnetic resonance technique combined with chemometrics was employed to establish the quantitative models for rapidly monitoring the changes of indicators (hydroxyl value (OHV), epoxy value (EV), polymeric hydroxyl value (POHV, reflecting the degree of polyetherification)) during the ring opening of epoxidized soybean oils. Comprehensively considering the variations of peak retention times and peak areas of LF‐NMR spectra, OHVs of vegetable oils‐based polyols were divided into low OHV (LOHV, … Show more
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