DMSO solution methacrylates

The 1H-NMR spectra of the copolymers in DMSO solution were recorded and the ratios (X) of uncyclized methacrylic anhydride units to styrene units in the copolymers were determined from the relative intensities of the resonances at 6=5.72, 6.15 and 6.5-7.5 ppm. 

Preparation of ali-trans retinoic acid and methacrylate solutions. Stock dimethyl sulfoxide (DMSO) solutions of UDMA (from 27.5 mmol/L to 220 mmol/L), BDDMA ( 0.2 mol/L and 0.4 mol/L) and ATRA (1.00 mmol/L) were prepared immediately before use. As a general procedure, one of the above-mentioned solutions (1.0 pL) was added to 200.000 HL-60 cells in 1.0 mL of RPMI 1640 medium. 

The template polymerization of methacrylate monomers containing nucleic acid base was studied in the presence of the template polymer containing complementary nucleic acid bases. Four monomers N-P-methacryloylethyl derivatives of adenine (MAOA), thymine (MAOT), uracil (MAOU), and theophylline (MAOThe) were synthesized. Atactic polymers were obtained from these monomers by radical polymerization initiated by azobisiso butyronitrile (AIBN) in dimethylsulfox-ide (DMSO) solution and used as templates. 

Polymerization and Spinning Solvent. Dimethyl sulfoxide is used as a solvent for the polymerization of acrylonitrile and other vinyl monomers, eg, methyl methacrylate and styrene (82,83). The low incidence of transfer from the growing chain to DMSO leads to high molecular weights. Copolymerization reactions of acrylonitrile with other vinyl monomers are also mn in DMSO. Monomer mixtures of acrylonitrile, styrene, vinyUdene chloride, methallylsulfonic acid, styrenesulfonic acid, etc, are polymerized in DMSO—water (84). In some cases, the fibers are spun from the reaction solutions into DMSO—water baths. 

Polymer films, e.g., poly((V-hydroxysuccinimidyl methacrylate) (PNHSMA) [68], are prepared by spin-coating polymer solutions in a suitable solvent (here DMSO with a typical concentration between 10 and 20 mg/ml) onto clean silicon wafers. To remove traces of the solvent, the films are dried in vacuum for several days. Some of the sample is immersed in PBS buffer for swelling time of 100 min, followed by rapid drying of the surface in a gentle stream of nitrogen. For the determination of... 

H-NMR studies. Varian A-60 and HR-100 NMR spectrometers were used to measure the 1H-NMR spectra of styrene-methacrylic anhydride copolymers in DMSO-dg solution at 90° and of the derived styrene-methyl methacrylate copolymers in CCli, and C6D6 solution at 75-80°C. Solvent resonances interfered with composition determinations in the case of styrene-methacrylic anhydride copolymers, but the ratio of uncyclized methacrylic anhydride to styrene units (X) could be measured from the relative intensities of resonances observed at 6=5.72 and 6.15 ppm (olefinic protons) and at 6.5-7.5 ppm (aromatic protons). The compositions of the derived styrene/-MMA copolymers were calculated from the proportion of aromatic proton resonance observed in the spectra of copolymers dissolved in CClm as was described previously (6). Letting Y represent the ratio of styrene to MMA units in the derived copolymers, the compositions of the parent styrene-methacrylic anhydride copolymers were calculated as follows ... 

Moreover, efficiency of phase inversion imprinting can be improved with pre-forming complex of monomer-template (Table 2) in copolymerization [70]. The THO-acrylic acid or methacrylic acid precomplex monomer was copolymerized with acrylonitrile in DMSO. The resultant viscous solution contents were used for phase inversion in water after template copolymerization. Template copolymers can improve binding capacity of THO. From H-NMR analysis, this is due to tailor-made modification of a copolymer backbone for the template molecule. Also, comparison was made between copolymers of acrylic acid and methacrylic acid in THO selectivity of the imprinted polymers. Presence of the methacryl methyl group is more efficient in the tailor-made structure of the THO template. 

Blends of poly(methacrylic acid) or polystyrene with epoxidised linseed oil are prepared in solution by mechanical mixing in dimethyl sulphoxide (DMSO) or tetrahydrofuran (THF) to improve the performance of the individual components. However, blends of poly(methylacrylic acid) are not able to produce compatible systems, although different compositions (15-55 wt%) of polystyrene blends will form miscible blends. The results show an improvement in properties, including biodegradation of the miscible blends, and the systems are comparable with low density polyethylene. 

Figure 7.26 25 MHz C[ H]-NMR spectrum of acrylonitrile (A)-methyl methacrylate (M) copolymer (79.0 mol% of A in feed) recorded in DMSO-dg solution at 120 °C. Reprinted with permission from G.S. Kapur and A.S. Brar, Polymer, 1991, 32, 6, 1112. 1991, Elsevier [192])...

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