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- W4243779620 abstract "Solid state deuterium NMR spectroscopy is used to provide information concerning the motional heterogeneity and homogeneity of segmented co-polyesters containing poly(butylene terephthalate) as the hard segment. The results presented here provide the first clear evidence that there are two distinct motional environments for the hard segments in the co-polyester. One of the environments is identical to that observed in the poly(butylene terephthalate) homopolymer, in which Helfand-type motions about three bonds (Helfand, E. J. Chem. Phys. 1971, 54, 4651) occur with a correlation time of 7 x 10-6 s at 20°C. The other motional environment is more-nearly isotropic. The residues in the mobile environment are attributed to short blocks of hard segments residing in the soft segment matrix, or to hard segments forming the loop regions in the poly(butylene terephthalate) lamellae. Approximately 10% of the hard segments reside in the mobile environment in the segmented copolymer with 0.87 mole fraction of poly(butylene terephthalate) hard segments." @default.
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- W4243779620 date "1984-03-28" @default.
- W4243779620 modified "2023-10-10" @default.
- W4243779620 title "Solid State <sup>2</sup>H NMR Studies of Molecular Motion" @default.
- W4243779620 doi "https://doi.org/10.1021/bk-1984-0247.ch004" @default.
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