IR-spectroscopic features of polyconjugated structures in heat treated polyacrylonitrile chains

Platonova, N. V.; Клименко, И. В.; Vinogradov, B. A.; Maiburov, S. P.; Boyarkin, K.Ye.

doi:10.1016/0032-3950(89)90241-4

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…The IR spectrum of the PAN‐HV3 nonmodified membrane (Figure 2) exhibited prominent peaks at 2243 cm −1 (C=N absorbance) and at 1452 cm −1 (νCH 2 ) and peaks at 1731 and 1625 cm −1 that may be attributed to traces of remaining DMF or to the presence of a comonomer 32–34. For grafted polymer the characteristic peaks described below were obtained: Evidence of grafting of MA was provided by the appearance of carbonyl C=O groups at 1730–1700 cm −1 35.…”

Section: Resultsmentioning

confidence: 97%

Preparation and characterization of layered membranes constructed by sequential redox‐initiated grafting onto polyacrylonitrile ultrafiltration membranes

Belfer

Bottino

Capannelli

2005

J of Applied Polymer Sci

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Layered membranes were prepared by sequential grafting-by means of redox initiators-of watersoluble monomers, with oppositely charged ionic groups, onto ultrafiltration (UF) polyacrylonitrile (PAN) membranes at room temperature. Grafting of a single layer of 2-hydroxyethylmethacrylate (HEMA) onto a PAN membrane gave a highly grafted membrane with a relatively high water flux. Bilayered membranes with various properties containing poly-2-(dimethylamino)ethyl methacrylate (p-2DMAEMA) as the bottom layer and polymethacrylic acid or polystyrenesulfonic acid (p-SSA) as the upper layer were prepared and compared-by means of infrared spectroscopy and electron microscopy-with single-layered membranes of grafted polyhydroxyethylmethacrylate. Layered membranes exhibited a significant decline in water flux in comparison with the initial UF membranes. The flux could, however, be manipulated by controlling the concentration of monomers, the time of grafting, and the number of layers. When four layers of p-2DMAEMA and p-SSA were sequentially grafted onto a PAN membrane, pure water fluxes were stable over a wide range of pH values and did not change over long storage times.

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Section: Resultsmentioning

confidence: 97%