Nuclear Spin Relaxation Studies of Elastin, II. A Preliminary Investigation of the Effects of Stretching and Solvent Composition on Proton Transverse Relaxation
In part I (1) we reported, inter alia, a study of the proton magnetic transverse relaxation characteristics of D20-exchanged and -hydrated elastin. The observed proton free induction decays (FID’s) were found to be describable in terms of a superposition of three independent transverse relaxation processes, the fastest being Gaussian in character, the two slower ones being exponential. These three processes were assigned to protons in three “sites” in the elastin each having sufficiently different motional characteristics to ensure that the transverse relaxation behaviour in each site was quite distinct. The shortest relaxation time site, which showed Gaussian relaxation behaviour, was assigned to protons 1n the regions of the crosslinks whilst the other two (exponential) relaxation time components were interpreted in terms of two sites having different water contents and overall mobilities.
KeywordsRelaxation Time Block Copolymer Solvent Composition Free Induction Decay Rotational Correlation Time
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