In this work binary blends formed by poly(vinylpyrrolidone) (PVP) and poly(ethylene oxide) (PEO) were studied by solution and solid-state NMR to determine their physical interaction, homogeneity, and compatibility for use as membranes to separate water/alcohol. The NMR results allowed us to ...
Nuclear magnetic resonance measurements have been obtained from the hydrogen and 13 C nuclei of Poly (ethylene-oxide) grafted on silica, in contact with C 6 D 6 . A twofold phase system is observed in the temperature range 10 up to 70掳C, with a population ratio of about one at 65掳C...
(Received February 13, 2001; Accepted April 28, 2001) ABSTRACT: Solid-state 13C cross-polarization/magic-angle spinning/dipolar Decoupling (CP/MAS/DD) nuclear magnetic resonance (NMR) spectroscopy of poly(ethylene oxide) (PEO) tethered on silica was studied to character- ize the conformation ...
We have studied the low‐temperature NMR line shape for three nuclei (1H,7Li, and19F) in poly(ethylene oxide)‐lithium salts (LiClO4, LiBF4, and LiAsF6) solid polymer ionic conductors and measured their spin–lattice relaxation rates as functions of frequency and temperature. The three nuclei...
31, No.7, pp 602-608 (1999) 13C CP/MAS and 7Li NMR Study of Lithium Perchlorate/Poly(ethylene oxide) Atsushi AsANo,t.ttt K. TAKEGOSHI,tt and Kunio HIKICHI Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060--0810, Japan (Received February 16,...
采用熔融缩聚反应合成一系列聚(D,L-乳酸)(PDLLA)/聚乙二醇单甲醚(mPEG)两亲性二嵌段共聚物(PEDLLA),采用IR、1H-NMR、DSC、WAXD和TEM等手段分析和研究PEDLLA的结构与性能。 2. A series of methoxy poly(ethylene glycol)-b-poly(ε-caprolacton) copolymers have been synthesized by ring-opening polymerizat...
This paper presents a study of the permeation of poly(ethylene oxide) (PEO) chains through the nanoporous wall of hollow polymeric capsules prepared by self-assembly of polyelectrolytes. We employ the method of pulsed field gradient (PFG) NMR diffusion to distinguish chains in different sites, i...
Hexanal and aldehyde-terminated poly(ethylene oxide) (PEO) were simultaneously attached to PVAm via reductive amination. Surfactant polymers with different PEO : hexanal ratios and hydrophilic/hydrophobic balances were prepared, and characterized by FT-IR, 1H-NMR and XPS spectroscopies. Surface active ...
125 MHz 13C NMR spectra of poly(S)-( - )-(propylene oxide) prepared with insoluble Bu2 SnO-Bu 3PO4 (1 : 2) condensate measured in benzene-d6 at 50°C. (A) Benzene-hexane (! : 2) insoluble fraction. (B) Benzene-hexane (I : 2) soluble fraction. complicated signals (Figure 2...
Samples were characterized by element analysis, FTIR, 1H-NMR, EDX mapping, X-ray, gel permeation chromatography, and impedance analysis. The SPUs exhibited an amorphous structure. The maximum conductivity of the SPU was 1.02 × 106 S cm1 at the room temperature. 2000 John Wiley & Sons, Inc....