Elucidation of the Chain-Folding Structure of a Semicrystalline Polymer in Single Crystals by Solid-State NMR

2014 ◽  
Vol 3 (6) ◽  
pp. 556-559 ◽  
Author(s):  
You-lee Hong ◽  
Toshikazu Miyoshi
Keyword(s):  
Solid State ◽  
Single Crystals ◽  
Solid State Nmr ◽  
Semicrystalline Polymer ◽  
Chain Folding ◽  
Folding Structure

High resolution triple resonance micro magic angle spinning NMR spectroscopy of nanoliter sample volumes

2016 ◽  
Vol 18 (6) ◽  
pp. 4902-4910 ◽  
Author(s):  
J. Ole Brauckmann ◽  
J. W. G. (Hans) Janssen ◽  
Arno P. M. Kentgens
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
Single Crystals ◽  
Solid State Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Triple Resonance ◽  
Angle Spinning

To be able to study mass-limited samples and small single crystals, a triple resonance micro-magic angle spinning (μMAS) probehead for the application of high-resolution solid-state NMR of nanoliter samples was developed.

ChemInform Abstract: PbO/PbF2 Flux Growth of YScO3 and LaScO3 Single Crystals - Structure and Solid-State NMR Spectroscopy.

ChemInform ◽  
2010 ◽  
Vol 42 (2) ◽  
pp. no-no
Author(s):  
Sarkarainadar Balamurugan ◽  
Ute Ch. Rodewald ◽  
Thomas Harmening ◽  
Leo van Wuellen ◽  
Daniel Mohr ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Single Crystals ◽  
Solid State Nmr ◽  
Flux Growth ◽  
Solid State Nmr Spectroscopy

PbO / PbF2 Flux Growth of YScO3 and LaScO3 Single Crystals – Structure and Solid-State NMR Spectroscopy

2010 ◽  
Vol 65 (10) ◽  
pp. 1199-1205 ◽  
Author(s):  
Sarkarainadar Balamurugan ◽  
Ute Ch. Rodewald ◽  
Thomas Harmening ◽  
Leo van Wüllen ◽  
Daniel Mohr ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Flux Growth ◽  
Quadrupolar Interaction ◽  
Angle Spinning ◽  
Good Agreement

Well-shaped small single crystals of the orthorhombic perovskites YScO3 and LaScO3 were grown from mixtures of the corresponding sesquioxides RE2O3 in PbO/PbF2 fluxes. Both structures were refined from single-crystal diffractometer data: GdFeO3-type, Pnma, a = 570.68(7), b = 789.3(1), c = 542.44(7) pm, wR2 = 0.0363, 448 F2 values for Y0.96ScO2.94, and a = 579.68(9), b = 810.3(2), c = 568.3(1) pm, wR2 = 0.0387, 513 F2 values for La0.94ScO2.91, with 32 variables per refinement. The 4c rare-earth sites of both perovskites show small defects which are charge-compensated by defects on both oxygen sites, leading to the compositions La0.94ScO2.91 and Y0.96ScO2.94 for the investigated crystals. The rare-earth sites have been characterized by 89Y and 45Sc magic-angle spinning (MAS) NMR. The 45Sc quadrupolar interaction parameters extracted from these spectra by simulations are found to be in good agreement with those obtained from DFT calculations of the electric field gradient.

ChemInform Abstract: Sc2(MoO4)3and Sc2(WO4)3: Halide Flux Growth of Single Crystals and45Sc Solid-State NMR.

ChemInform ◽  
2010 ◽  
Vol 41 (15) ◽  
Author(s):  
Sarkarainadar Balamurugan ◽  
Ute Ch. Rodewald ◽  
Thomas Harmening ◽  
van Wuellen Leo van Wuellen Leo ◽  
Daniel Mohr ◽  
...  
Keyword(s):  
Solid State ◽  
Single Crystals ◽  
Solid State Nmr ◽  
Flux Growth

Chain Folding and Diffusion in Monodisperse Longn-Alkanes by Solid-State NMR

2009 ◽  
Vol 42 (12) ◽  
pp. 4175-4180 ◽  
Author(s):  
Giuseppe Grasso ◽  
Jeremy J. Titman
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Chain Folding ◽  
And Diffusion

A New Defect in Polyethylene Single Crystals

1973 ◽  
Vol 31 ◽  
pp. 70-71
Author(s):  
E. L. Thomas ◽  
S. L. Sass
Keyword(s):  
Single Crystals ◽  
Screw Dislocation ◽  
Small Distance ◽  
Dipole Model ◽  
Dislocation Dipole ◽  
Chain Folding ◽  
Black And White ◽  
Polymer Crystal ◽  
Different Types

In polyethylene single crystals pairs of black and white lines spaced 700-3,000Å apart, parallel to the [100] and [010] directions, have been identified as microsector boundaries. A microsector is formed when the plane of chain folding changes over a small distance within a polymer crystal. In order for the different types of folds to accommodate at the boundary between the 2 fold domains, a staggering along the chain direction and a rotation of the chains in the plane of the boundary occurs. The black-white contrast from a microsector boundary can be explained in terms of these chain rotations. We demonstrate that microsectors can terminate within the crystal and interpret the observed terminal strain contrast in terms of a screw dislocation dipole model.

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