Pfropfcopolymerisation der Cellulose unter Zuhilfenahme von Reaktivinitiatoren

Rebek, Marius; Schurz, J.; Popp, W.

doi:10.1515/hfsg.1967.21.2.58

Cited by 5 publications

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“…The radicalization of cellulose can be performed by introducing halogen-substituted ester groups, mercaptyl groups and diazo groups (Sankalia et al 1962;Rebek et al 1967a). The radicalization of cellulose can be performed by introducing halogen-substituted ester groups, mercaptyl groups and diazo groups (Sankalia et al 1962;Rebek et al 1967a).…”

Section: Graft Copolymers Of Cellulosementioning

confidence: 99%

17. Derivatives of Cellulose

1983

Wood

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Cellulose is mainly utilized in a more or less purified condition in the form of paper and paperboard. But derivatives having properties different from those of cellulose are also used in numerous fields. In some cases the derivatives are only intermediates for transforming the state of cellulose (e.g. for the production of threads and foils). (Fig. 17-1). Cellulose can be regarded as a polyalcoholic compound as each glucose unit within the molecular chain bears three hydroxylic groups (-» 4.2.1.). Cellulose, however, is a solid-state polyalcohol, most of its OH-groups being linked by hydrogen bonds (-» 4.2.4.). Nevertheless the OH-groups may react like those from other alcohols forming various derivatives. Thus the formation of esters with inorganic and organic acids, ethers with other alcohols, alcoholates with bases, oxidation products (acids), halogenides, amines, complexes etc. is possible

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Section: Graft Copolymers Of Cellulosementioning

confidence: 99%

17. Derivatives of Cellulose

1983

Wood

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“…The graft copolymerization of monomers onto cellulose has been pursued most actively using methyl methacrylates and related monomers (126,148,150,151,(153)(154)(155). Styrene has been studied (146,156), as has vinylpyridine (157) and methylvinylpyridine (158).…”

Section: Resin-bonded Cellulose Separatorsmentioning

confidence: 99%

Resin‐Bonded Cellulose Separators: An Overview with Prognoses

Dafler¹

1978

J. Electrochem. Soc.

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Resin-bonded cellulose separators are very widely used in the starting, lighting, and ignition battery industry. Since their appearance and maturity, they have undergone systematic improvements, but their basic shortcomings have remained. Separator development is reviewed here, and the pertinent structure and chemistry of the cellulose substrate is discussed. The current literature, which indicates that improvements in substrate character and acid resistance can be made, isalso reviewed.In 1917, almost the beginning of the modern starting, lighting, and ignition battery industry, Brooks pointed out the lead-accumulator was unexcelled in portable service applications (1). Separators at that time were wood veneer and were superior to anything in use despite the stringent requirements of their manufacture. At that time, only treated wood possessed good wicking action and reasonable conductivity and held active material in place against vibration and the eroding action of hydrogen generated on overcharge. Other materials had been tried, but until the microporous hard rubber separator appeared, wood veneers and combinations of wood and other materials dominated separator practice. Eyanson developed an unglazed porcelain membrane with incorporated lead spacers (2), but this product undoubtedly gave a cell of high internal resistance. Sperry developed a perforated, corrugated, hard rubber sheet that was really a simple, open spacer (3). ~he earliest hard rubber separators, used as adjuncts to wood, were approximately 30% porous. Batteries in which they were used were poor for cranking purposes (4).Hardy and Hungerbuhler (5) experimented with artificial stone for making separator membranes. They compressed and then baked silicates, feldspars, bone, and lime to form refractory porous sheets. Rodman (6, 7) experimented with techniques to make porous glass separators, developing membranes of sand or fine glass powder flitted together.In 1910, Flanders described an untreated wood veneer separator using a well-defined rib structure (8), and after this a number of wood/hard rubber combinations were developed. Carpenter (9) coa'~ed thin wood sheets with' vulcanized rubber, and Chamberlain described a process to produce wood veneers machined so that the ribs were integral to the separator structure (10). Gould's patent, describing the use of hard rubber and wood laminated together, appeared in 1916 (11).Many battery researchers applied themselves to the separator problem between Brooks's time and the period during which the resin-bonded paper separator appeared, then matured. One of the more interesting * Electrochemical Society Active Member, 1 Present address: Institute of Gas Technology, Chicago, Illinois 60616.inventions was Bliss's (12) ingenious attempt to make a porous phenol-formaldehyde sheet. He mixed asbestos and zinc with resin, polymerized it, and removed the zinc with acid. A number of other inventions included a separator of chopped bird feathers and sodium sulfite (13), bitumen-impregnated felts (14), roofing fel...

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Versuche zur charakterisierung eines polystyrol‐gepfropften zellstoffes

Schurz

Rebek

Spörk

1967

Angew. Makromol. Chem.

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Ein Pfropfcopolymeres aus Cellulose (Zellstoff) und Polystyrol wird durch Carbanilierung in Losung gebracht. An den Dioxan-Losungen werden viskosimetrische und UV-Untersuchungen durchgefuhrt sowie eine fraktionierte Fallung. Es liegen echte Pfropfprodukte vor. Fraktionen mit niedriger Grenzviskositatszahl tragen mehr, aber kurzere Polystyrolseitenketten als solche mit hoher Grenzviskositatszahl. SUMMARY :A graft copolymer of cellulose (wood-pulp) and polystyrene is made soluble by carbanilation. The dioxane-solutions are used for viscometric and UV-spectrophotometric investigations, as well as for a fractionated precipitation. The material is a genuine graft copolymer. Fractions with low limiting viscosity number carry more, but shorter branches of polystyrene than such ones with high limiting viscosity number.

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Pfropfcopolymerisation der Cellulose unter Zuhilfenahme von Reaktivinitiatoren

Cited by 5 publications

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17. Derivatives of Cellulose

17. Derivatives of Cellulose

Resin‐Bonded Cellulose Separators: An Overview with Prognoses

Versuche zur charakterisierung eines polystyrol‐gepfropften zellstoffes

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