NMR study of configurational sequences in polymethacrylic acid

pH-Dependent complexation of poly(acrylic acid) derivatives with phospholipid vesicle membranes

“…The following solvents and temperatures were used: for poly-(methyl -ethylacry lates), nitrobenzene-d5,150 °C; for poly(methyl methacrylates), CDC13, 58 °C; for poly(methacrylic acids), N,Ndimethylformamide-d7, 100 °C. 15 The tacticity of the poly(a-ethylacrylic acid) sample prepared by radical polymerization was determined after methylation of the polymer with diazomethane. Caution!…”

Complete triad assignment in the NMR spectra of methyl methacrylate–methacrylic acid copolymers

“…tained from radical initiated MMA-MAA copolymers by comparing the Confirmation of the assignment for the heterotactic triads may be ob- a -CH, peak intensities experimentally found with these calculated. By esterifying the copolymers it is easily shown that, independent of the copolymer composition, the amounts of the syndiotactic, isotactic, and heterotactic groups of Figure 1 are nearly 64, 4, and 32%, respectively (4). Thus the heterotactic resonances should be present with intensities sufficient to check their assignment.…”

“…Chemical shifts were recorded a s ppm on the 6 scale, referring to octamethylcyclotetrasiloxane (OMTS) a s an internal standard unless indicated otherwise. From the spectra the composition, P(A), of the MMA-MAA copolymers has been determined as described (4). For MMA -d5-MAA copolymers the determination of P(A) was based on:…”

Polymer Degradation Mechanism Reselection through Derivatization for Qualitative Pyrolysis Gas Chromatography Analysis

“…The structural features in the different crystalline phases have been investigated by infrared (IR) and Raman spectroscopy . The ratio of different tacticity, configurational sequences has been studied by nuclear magnetic resonance (NMR) spectroscopy. , The thermal degradation mechanism at low temperature (100−300 °C) has been studied by pyrolysis gas chromatography/mass spectrometry (Py-GC/MS) . The copolymer of MAA and methyl methacrylate (MMA) has been studied by pyrolysis for hydrocarbon formation and by NMR for copolymer composition .…”