Triad sequence assignment of the 13C-NMR spectra of copolymers of ethylene oxide and 1,2-butylene oxide

Effects of block architecture and composition on the association properties of poly(oxyalkylene) copolymers in aqueous solution

“…This transfer reaction has consequences for the compositions of E/P block copolymers, not only broadening the P-block-length distribution, but also giving rise to a proportion of diblock PE copolymers in purportedly EPE triblocks, and of homopoly(oxypropylene) if P is added in the second stage of sequential copolymerisation. It is absent in the anionic polymerisation of 1,2-butylene oxide (BO) and styrene oxide (SO) under laboratory conditions 42,43) , although it is known in polymerisation under more extreme conditions (high temperatures) used in industry 41) . It is important that impurities arising from these effects, and from initiation by moisture accidentally introduced with the monomers, are either accounted for in interpretation of results or, preferably, are removed 44,45) .…”

Association properties of diblock copolymer of ethylene oxide and 1,2-butylene oxide: E17B12 in aqueous solution

“…Diblock copolymer E 17 B 12 was prepared by sequential anionic polymerization using a vacuum line and ampoule technique using procedures described previously [10,11]. A sample of α-methyl, ω-hydroxypoly(oxyethylene) was partly converted to its potassium salt (mole ratio OH/OK ≈ 5), and heated at 65 • C for 5 days under vacuum to remove moisture.…”

Synthesis and Micellization of Linear−Dendritic Copolymers and Their Solubilization Ability for Poorly Water-Soluble Drugs

“…However, in the 13 C NMR spectrum, the peak of the end CH 2 is at 61.4 ppm and well separated from the other peaks. 31 After coupling with NPC, the hydroxyl group was replaced by a carbonate link. A new peak appeared in the 1 H spectrum (Figure 2b) at 4.40 ppm, which corresponds to the end CH 2 group, while the peaks between 7.4 and 8.3 ppm are from the protons of phenyl group.…”