On the mechanism of grafting chains of synthetic polymers to cellulose using salts of transition metals

Kurlyankina, V.I.; Molotkov, V. A.; Koz'mina, O.P.; Хрипунов, А. К.; Shtennikova, I.N.

doi:10.1016/s0014-3057(69)80037-6

Cited by 6 publications

(1 citation statement)

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“…The grafting of vinyl monomers from polymers, containing hydroxyalkyl groups, is a well known procedure for polymer preparation. Radicals can be selectively generated on polymers like cellulose, starch, polyvinyl alcohol etc., by oxidation with transition metal ions ‐ Co 3+ , Ce 4+ , Mn 3+ , V 5+ , and Fe 3+ 21–23. In this study we used CAN ((NH 4 ) 2 Ce(NO 3 ) 6 , CAN) as initiator (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

Polybenzimidazole‐graft‐polyvinylphosphonic acid—proton conducting fuel cell membranes

Sinigersky

Budurova

Penchev

et al. 2012

J of Applied Polymer Sci

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A new method for the preparation of polybenzimidazole (PBI)‐based membranes, containing high concentrations of immobilized phosphonic acid groups, has been developed. The procedure used is carried out in two steps: (1) Synthesis of modified PBIs, containing 1,2‐dihydroxypropyl groups and preparation of films there from; (2) Introduction of vinylphosphonic acid (VPA) and initiator (cerium ammonium nitrate) in the film, subsequent grafting of VPA from the active sites of the PBI backbone. Membranes with different length of the grafted polyvinylphosphonic acid chains were prepared. The molar ratio grafted VPA units per PBI repeating unit reaches 7.8. Proton conductivity was measured at 120°C and relative humidity (RH) 20–100%. For the membrane with highest concentration of phosphonic acid groups the proton conductivity was 35 mS cm−1 at 100% RH and 8 mS cm−1 at 20% RH. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Section: Resultsmentioning

confidence: 99%