¹³C Nuclear Magnetic Reasonance Spectroscopy of Polydienes, Microstructure of Polybutadiene

Network structure and reaction mechanisms in high pressure and peroxide vulcanization of polybutadiene: Microstructural changes studied by13C solid-state NMR

“…15 For unsaturations in the ␣ position to the observed carbon, compensations were made by the parameters given by Clague et al 14 The prediction of the shifts is indeed very good, even for the carbons in the vicinity of branched structures (vinyl groups). This congruence is important to bear in mind in the prediction of unknown structures resulting from the crosslinking processes.…”

“…The aliphatic and olefinic parts are magnified to clearly show the designations of the peaks. The numbering emanates from the study of Clague et al, 14 who performed solution NMR on polybutadienes with different vinyl content. As can be seen, around 17 peaks can be separated due to the different sequences of cis, trans, and vinyl units; the corresponding carbons in the polymer chains are given in Figure 2.…”

“…The observed aliphatic shifts are given in Table II along with those observed by Clague et al 14 and calculated shifts using the method and parameters suggested by Lindeman and Adams. 15 For unsaturations in the ␣ position to the observed carbon, compensations were made by the parameters given by Clague et al 14 The prediction of the shifts is indeed very good, even for the carbons in the vicinity of branched structures (vinyl groups).…”

Synthesis and characterization of hydrogenated poly[alkylmethacrylate(-b-styrene)-b-butadiene-b-(styrene-b-) alkylmethacrylate] triblock and pentablock copolymers

“…lines are quite narrow. From the comparison of the signal intensities with intensities predicted by Bernouilli statistics [22], the ethylene and butylene units appear to be randomly distributed, as it is the case of the hydrogenation of PBD synthesized with a monofunctional initiator instead of a difunctional one in this study. The quantitative hydrogenation of PtBMA-PBD-PtBMA and PIBMA-PBD-PIBMA triblock copolymers has also been ascertained by FTi.r., as shown in Figures 6 and 7.…”

“…spectrum for the MEBM sample HA4. The assignment of the resonance peaks relies upon data reported elsewhere for hydrogenated PBD of a comparable microstructure [22]. The signal 1 at 30.01 ppm is typical of the methylene carbons of polyethylene sequences.…”