Spectra methyl cellulose

Methyl cellulose OH stretching, 2.90 Aliphatic CH stretching, 3.42, 3.51 Adsorbed water, 6.15 (similar spectrum to cellulose)... 

A five-line e.s.r. spectrum is recorded. Evidently, the grafted polymer on the photoirradiated cellulose had a conformation that restricted rotation about the Ca - Cg bond, so that only one of the methylene hydrogens and the freely rotating methyl group interact with the unpaired electron (17). 

Gel permeation chromatography (GPC) of poly(methyl methacrylate) and cellulose nitrate showed elution volume peaks at 62.5 ml for PMMA and at 87.5 for cellulose nitrate (Figure 5), due to their difference in molecular weight. A mixture of poly(methyl methacrylate) and cellulose nitrate of the same ratio as that of the graft copolymer was recorded and two peaks in elution volume at almost identical positions were observed. This shows that the constituent homopolymers retain their identity in a physical mixture. The isolated graft copolymer showed a single peak in elution volume at 80.0 ml. The second peak in elution volume is absent in spite of poly(methyl methacrylate) attached to cellulose nitrate as revealed by infrared spectrum. Hence, these results indicate that GPC can be used as a technique to differentiate between homopolymer, physical mixture, and graft copolymer. 

Figure 7. Changes in ESR spectra of cotton cellulose mechanoradicals. Key a, initial spectrum observed at 77 K immediately after milling for 4 h at 298 K b, cotton cellulose after milling was contacted with methyl methacrylate and warmed at 298 K for 2 min c, 5 min d, 10 min recorded at 77 K.

Methyl ammonium iodide has apj = b64mX. Bound to ion-exchange membranes. Bound to cellulose and polysulfones. 5-line spectrum J>af radical pair. Spectrum reproduced variable temperature study. ... 

The decay of radicals produced by photo-irradiation of cellulose at room temperature, and the characteristics of photo-irradiated cellulose for the initiation of graft copolymerization with methyl methacrylate have been investigated. The e.s.r. spectra of irradiated samples of untreated, swollen, oximated, or ferric-ion-sensitized celluloses were examined. The decay of radicals was accelerated by solvents (water — methanol > acetone > p-dioxan) and was retarded by methacrylic acid > methyl methacrylate styrene. Graft copolymerization of methyl methacrylate with photo-irradiated cellulose was effectively initiated by water or methanol, but not by either acetone or p-dioxan. It appears that initiation of the graft copolymerization onto pre-irradiated cellulose is promoted by radicals exhibiting a singlet in the e.s.r. spectrum. 

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