Characterization of styrene/methacrylic acid copolymers by 2D‐NMR spectroscopy

Abstract

Styrene/methacrylic acid copolymers were prepared by free-radical photopolymerization using the uranyl nitrate ion as the initiator. The copolymer composition was determined from 1 H-NMR spectroscopy. The comonomer reactivity ratios determined using Kelen Tudos and nonlinear error in variable methods (EVM) are r m ϭ 0.61 Ϯ 0.05 and r s ϭ 0.14Ϯ 0.07. The broad and overlapping 1 H-NMR spectrum was assigned using the help of 2D TOCSY and NOESY experiments. These methods were used to ascertain the various geminal, vicinal, and spatial couplings between the protons. The methyl and methine protons also show configurational and compositional sensitivity.

Soap-free emulsion polymerization of styrene using poly(methacrylic acid) macro-RAFT agent

“…For PS in Fig. 2(b), two multiplets were observed at 6.2-7.2 ppm for five protons of the phenyl ring (d 0 ) and methane and methylene of the PS were observed at 1-2 ppm [37]. Fig.…”

Ionic nanocomposite networks in poly(styrene‐co‐methacrylic acid) copolymers with calcium carbonate

“…The indexation of the peaks in this spectra and the attribution of the triads shown in Figures 2 and 3 have been done from the Brar and Hekmatayar study. 40 The results of the solubility tests in tetrahydrofuran (THF) are summarized in Figure 4. The result is binary (soluble when the THF solution turned slightly turbid or swelling when the initial shape of the polymer sample was still recognizable in the tube; more details are given in experimental) and depends on the MAA/Sty and CaCO 3 /MAA ratios.…”

Boron Subphthalocyanine Coupled to Methacrylate‐Rich Terpolymers by Nitroxide Mediated Polymerization: The Subphthalocyanine Dictates the Phase Transition Temperatures

“…Due to a slight mismatch in reactivity ratios ( r s = 0.14 and r MAA = 0.61, r s = 1.27, and r BMA = 0.59), the T g s are higher than expected indicating a small difference in composition. [15b,20]…”