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. 2019 Oct 18;7:683. doi: 10.3389/fchem.2019.00683

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Copyright © 2019 Shi, Chi, Luo, Jiang, Loh, He and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Five hundred megahertz ¹H NMR spectrum of (A) ω-pentadecalactone, (B) PPDL-diol, (C) 2PDEP (a', b' represent protons on terminal unit of PEG and PPG segments which reacted with HMDI) and (D) ¹³C NMR spectrum of 2PDEP in CDCl₃.