NMR spectra of poly

Fig. 1.1H-NMR spectra of poly-6,8-dioxabicyclo[ 3.2.1 joctane prepared In methylene chloride at A, 0 °C and B, - 78 °C. Solvent, CDCI3 concn., ca. 5% room temp. 100 MHz...

Figure 7. REDOR 13C NMR spectra of poly (aery lie acid) (PA) imbibed with [3-13C]Ala/[15N]Ala (50 1 1 by weight). The bottom curve represents the echo spectrum of full sample (S0) The top curve is the REDOR difference. (AS). Spectra were collected using the pulse sequence of Figure 2 with VR = 3 kHz NC = 30.

Fig. 3. -NMR spectra of poly(phenylmethylsilylene) ([(SiPhMe)n]o=0.42 mol/L) (a), after reaction with triflic acid ([CF3S03H]o= 0.34 mol/L (b), and poly(methylmethoxysilylene) ([(SiOMeMe)n]o= 0.42 mol/L) (c) in CDCI3 using CH2CI2 as internal standard.

Table II. Composition and Tacticity Ratios Taken from 3C NMR Spectra of Poly(MMA/MAA) a...

Deuterium and 31P NMR spectra of poly(butylene terephthalate) and poly(bis (phenoxy) phosphazene) have also been analyzed on the basis of three conformational environments [194,195]. Significant interfacial contents of up to 25% were extracted from this analysis. In a more qualitative manner, an... 

Figure 4.20 29Si-NMR spectra of poly[methyl((J>)-2-methylbutoxyphenyl)silane]s (38 and 39) in benzene-Jg at 50°C.

Figure 5 a-CH3 portion of the C-NMR spectra of poly DMAEMA (a) prepared in water/ethanol, (b) prepared in water. 

NMR spectra of poly(5-VL) alone (I), poly(5-VL) in the mixtures of 3f and poly(d-VL) (II), and 31 and poly(5-VL) (III) ([3]o/[monomer units in poly(5-VL)]o=1.0) [77]. When the spectrum of the mixture was compared with that of poly(5-VL) alone, each signal due to poly(5-VL) in the mixture turned out to shift similarly to 5-VL in the presence of 3, and the extent of the shift was most noticeable in the signal assigned to the carbonyl carbon, where the signal A (5... 

Fig. 13.9 Carbon-13 solid-state NMR spectra of poly(ethylene) (a) cross-polarization magic angle spinning (CP/MAS), (b) progressive saturation, and (c) Torchia T, experiment.

C NMR spectra of poly(3-methyl-1-butene) and poly(4-methyl-1-pentene) were determined with a Varian CFT-20 spectrometer operated at ambient probe temperature ( 35° C) using 20-30% solutions of polymer in deuterated chloroform. Spectra were obtained utilizing off-resonance coupling and white noise decoupling techniques for both poly(3-methyl-l-butene) and poly(4-methyl-l-pentene). 

Inomata 211) studied the H-NMR spectra of poly(penta-1,3-diene) and concluded that with hexane as polymerization medium the polymers were about 49% cis-1,4 and 40% trans-1,4 enchained. The polymer derived from the cis monomer had 12% of 1,2-units which were exclusively trans that from the trans monomer had some 10 % of 1,2-units, two thirds of which were trans. Aubert et al.2I6) made a more extensive study of pentadiene polymers using both1H and 13C-NMR spectroscopy and modified the cis and trans-1,4 methyl resonance assignments made by Inomata 2U). 

We can successfully measure 170 MAS NMR spectra of poly(L-Ala)s using high-field and high-speed magic-angle spinning technique. From the 170 MAS spectra three kinds of NMR parameters such as chemical shift, quadrupolar coupling constant and asymmetric parameter were obtained exactly and understood the relationship... 

Figure 15. The proton noise decoupled 145.7-MHz 31P NMR spectra of poly-(dA-dT) in IM (CH,),NCl. lOmM cacodylate, ImM EDTA, 2H.O, pH 7.95 at 67°C. The chemical shifts are upfield from standard trimethylphosphate.

An analogous situation exists with 5-methylhexene-l except that in this case the path of the hydride ion is extended with one more CHa group. The NMR spectra of poly(5-methylhexene-l) obtained at —78° C. seems to indicate a predominantly 1,5 structure whereas a conventional 1,2 enchainment seems to occur when the polymerization is carried out at 0° C. 

Figure 9. NMR spectra of poly-1,5-octadienamer, extractable macrocyclic fraction from poly-1,5-octadienamer, and poly-1,5-octadienamer obtained by polymerization of the extractable macrocyclic fraction...

Fig. 8 Compared H NMR spectra of poly(N-tBoc-aminopropylmethyl-co-dodecylmethyl-co-dimethyl)-siloxane (lower) and the deprotected aminopropyl polysiloxane (upper)...

The NMR spectra of poly-DSP and poly-P2VB show a broad band at r 4.9-5.0 (4H) which is characteristic of protons bonded to a 1,2,3,4-tetraarylated cydobutane ring, and quantitative considerations are consistent with this assignment. 

Figure 1. NMR spectra of poly(phenylmethylsilylene) modified by trifluo-romethanesulfonic acid (HA), (a) [Si(CeHs)(CH3)-]o = 0.42 molIL (b) after reaction with [HA]o = 0.17 molIL and (c) after reaction with [HA]o = 0.34 mollL. CH2CI2 was used as internal standard (5.35 ppm). Spectra were taken in CDCI3 solvent at 25 °C.

Fig. 7 (a) H NMR spectra of poly(fert-butyl acrylate) (PTBA) synthesized by free radical polymerization of tert-butyl acrylate (TBA) in the presence of benzyl mercaptan (BnSH). (b) Dependence of the number average molecular weight (M ptba) of the PTBA on the BnSH/TBA ratio as obtained from H NMR end group analysis (filled circles) and SEC (open circles) (the actual BnSH/TBA molar ratio is indicated)... 

Fig. 7 Aliphatic region from the 188.6MHz ID NMR spectra of poly(ethylene-co-l-butene)...

Fig. 6 NMR spectra of poly(l-chloro-l-fluoroethy-lene) (A) F spectrum, (B) spectrum obtained with and F decoupling. (From Ref f)...

Figure 3. NMR spectra of poly(methyl methacrylate-co-methacrylic acid) obtained by (1) plasma-initiated polymerization and (2) thermal polymerization in 0.2% deuterated pyridine.

Fig. 16. Dipolar rotational spin-echo C-NMR spectra of poly(styrene-co-sulfone) as a function of the number of evolution cycles used during dipolar evolution (left).

Figure 22 shows the H CRAMPS NMR spectra of poly(L-leucines) (A) [Leu]n-1 (mostly /3-sheet and a few a-helix form) and (B) [Leu]n-2 (a-helix) in the solid state. These H spectra are solid high-resolution signals separated into three regions (NH, H , and side-chain protons), which is a similar result to that of PLA. From these spectra, it is clear that (1) the chemical shift of the H ... 

Fig. 21. 300 MHz H CRAMPS NMR spectra of poly(L-alanines) (A) H-[Ala]8-NHBu (j3-sheet form), (B) [Ala] -1 (averaged degree of polymerization DPn 16, Q-helix + /3-sheet forms), and (C) [Ala]n-5 (DP f 65, a-helix) (from ref. 16). Reproduced with permission from the American Chemical Society.

Poly (I.-valine) (PL Vchain-length dependence of H chemical shifts. Figure 24 shows the H CRAMPS NMR spectra of poly(L-valines) (A) [Val]n-1 (DPn is about 5, /3-sheet form) and (B) [Val]n-5 (DPn = 100, /3-sheet) in the solid state. The shoulder peak around 1.2-1.5 ppm in spectrum A is assigned to the —N—CH2— peak of the n-butylamide (—NHBu) group. It is well known that PLV is easily stabilized in /3-sheet form whereas it is very difficult to take an... 

---