By H. N. Cheng, Alan D. English
NMR Spectroscopy of Polymers in resolution and within the good State presents studies and unique papers at the use of nuclear magnetic resonance (NMR) spectroscopy for polymers. either artificial and usual polymers are coated. This publication additionally discusses either answer and reliable nation NMR.
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Extra resources for NMR Spectroscopy of Polymers in Solution and in the Solid State
Sample text
However, commercial gradient M A S probes for operation at high temperatures are not yet available. ch003 1 3 1 3 F2 (spmi Figure 8. 7K MAS proton-proton COSY of poly(butyl methacrylate-colethylhexyl acrylate) at 200 °C In a semi-crystalline polymer or in a polymer that contains crystalline domains, it is necessary to break apart all the crystalline domains for a true representative high resolution N M R analysis. This can be achieved by either addition of solvent or acquisition of data at temperatures close to the melting temperature of the crystalline domains.
E. spin-flip-flops) are a result of spin-spin dipolar couplings and require that the relative orientation of the interacting spins not change significantly for certain time duration. In a soft/flexible/viscous/visco-elastic state, the rapid fluctuations in relative position of all the surrounding nuclei lead to reduction in efficiency of spin diffusion. Higher the frequency of fluctuations, lower is the efficiency of spin diffusion, and narrower are the observed N M R resonances. The combination of M A S (to reduce magnetic susceptibility, C S A broadening, and static dipolar broadening), and temperature/plasticizing solvent (to reduce dipolar interactions) can lead to significantly narrow N M R resonances [1,2].
Comparing with the heteronuclear correlation spectrum of γC D / P C L complex (see Figure 3), we observed identical proton chemical shifts of the guest P C L and host γ-CD in the complex, indicating that there is efficient spin diffusion between them, as also observed in the VA-a-CD/IC, the di- and triblock-a-CD/ICs, and the triblock^-CD/IC, but not in the diblock^-CD/IC, where completely efficient spin diffusion is not observed during the 10 ms mixing time. Figures 4 and 5 present the heteronuclear correlation spectra for the diblock PCL-PS ICs with a- and γ-CD, respectively, where it is apparent that the PS protons are not in close proximity to the host protons of a- or γ-CDs.