Solid-echo delays

Figure 54. 2H NMR spectra for the type A glasses glycerol-, polystyrene-, and picoline-rfy at T/Ts ss 0.85. Results for solid-echo delays tp = 20, 100, and 200 ps are shown. In the case of picoline-(i7, the subspectrum of the methyl group was removed. (From Ref. 306.)...

Figure 55. 2H NMR spectra for type B glasses at 777), ss 0.85. Results for the neat systems lolucncw/,. polybinadiene-7,. and decaline-7,s are shown together with those for the binary mixtures 45% chlorobenzene-<7 in decaline and 55% decalincw/, s in chlorobenzene. Solid-echo delays...

Figure 56. (a) Results from random walk simulations for different solid-echo delay times 7, the... 

C-2H bond performs rotational random jumps on the surface of a cone with a full opening angle X = 6° (from Ref. 93). (b) Experimental 2H NMR spectra of chlorobenzene-ds in a mixture with cis-decalin at various temperatures T < Tg and at a long solid-echo delay tp [429]. 

Fig. 14. Effects of small-amplitude reorientation on 2H NMR experiments, as calculated by means of RW simulations. In the model, C-2H bonds (<5 = 2n 125 kHz, rj = 0) perform rotational random jumps on the surface of a cone with a full opening angle % = 6°. (a) 2H NMR spectra for various solid-echo delays tp (tj = t = 30 pis), and (b) 2H NMR correlation functions Fcos(tm) for various evolution times tp (tj = t = 10ms). (Adapted from Ref. 76.)...

Fig. 18. 2H NMR spectra of the type B glass TOL-d5 at various temperatures T< Tg — 117K. A large solid-echo delay tp = 200 ps was used so as to resolve highly restricted dynamics. The methyl group rotation is not observed for the ring-deuterated compound. (Adapted from Ref. 97.)...

Fig. 24. 2H NMR data for TOL at various temperatures T< 7R (a) measured (points) and simulated within the energy-landscape model (dashed lines) correlation functions / COK(fnbp — 80 is) (b) and (c) measured (solid lines) and simulated (dashed lines) 2H NMR spectra for solid-echo delays tp = 100 and 200 ps, respectively. (Adapted from Ref. 110.)...

Fig. 29. (left) 2H NMR spectra of PB-d6 (molecular weight is indicated) for large solid-echo delays tp = 5CM-00 gs (right) dielectric response of PB. (Adapted from Ref. 101.)... 

Fig. 34. 2H NMR spectra for the binary glass CB/cw-DEC at various temperatures. The used solid-echo delays tp are indicated. (Adapted from Ref. 56.)...

Fig. 6. The generalized Jeener-Broekaert three pulse sequence. Note that FT of the solid echo and the alignment echo starts at times delayed by the pulse separation r, after the second and third pulse, respectively...

Figure 5. H NMR spectra of [1.5]TS-1 (solid line) and S-1 (dashed line) inserts a) signal intensity versus echo delays r ([1.5]TS-1, solid line and S-1, crosses) and b) S-1 spectra acquired at various r delays.

Figure 4. Solid state deuterium NMR spectra of (a) poly (butylene terephthalate) (b) segmented co-polyester containing 0.96 mole fraction of poly (butylene terephthalate) hard segments and (c) segmented copolymer containing 0.87 mole fraction hard segments. (See text for specific deuterium labeling patterns.) All spectra were obtained with the quadrupole echo pulse sequence at 20 °C and 55.26 MHz, using 30 ts at the tj quadrupole echo delay time.

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