Cellulose partially ethylated

Isopropyl oleate n. (CH3)2CHOOCCi7H33. A plasticizer for cellulose nitrate, ethyl cellulose, and polystyrene, and, with partial compatibihty, vinyl resins. 

Total hydrolysis of the polymers gave D-glucose only. Water-soluble derivatives (ethyl or carboxymethyl ethers) of the polymers were unaffected by a-amylase, but were partially hydrolyzed by a ceUulase preparation from Acdobader xylinum. The optical rotations of several preparations of this polyglucose and of cellulose (P 1150) in tetraethylammonium hydroxide were all 0°, thereby strongly suggesting that the polyglucoses are /S-D-linked.109... 

The grafting process gives reproducible conversion and grafting efficiency (Table I) both for ethyl cellulose (EC, DS=0.60) and grease-proof pulp (GP). The measured grafting efficiency for the EC samples is lowered by a partial water solubility of the substrate. 

The most widely used synthetic and natural enhanced oil recovery polymers, such as partially hydrolyzed polyacrylamide, carboxymethyl(ethyl) cellulose, polysaccharides, or xanthan gums, are not suitable for high-temperature reservoirs (> 90 °C) with high-density brine fluid due to excessive hydrolysis and precipitation [277]. The main advantages of polymeric betaines over the mentioned standard polymers are (1) thermostability (up to 120 °C) (2) brine compatibility and (3) viscosification in brine solution [278]. Carbobetaines grafted onto hydroxyethyl cellulose were tested as a drilling-mud additive for clay hydration inhibition and mud rheological control [279]. An increase in the content of carbobetaine moieties resulted in an enhanced inhibitive abiUty, especially for sahne mud. 

A. H. Chan, W. J. Koros, D. R Paul, Analysis of hydrocarbon gas sorption and transport in ethyl cellulose using the dual mode sorption/partial immobilization modes, J. Membr. Sci. 3 (1978) 117-130. 

Blaschke described satisfactory separation of enantiomers of 52 and several 1-methyl-5,-5-disubstituted barbiturates by column chromatography on microcrystalline cellulose triacetate, but for some pairs of C-5 substituents (phenyl, propyl and 1-cyclopentenyl, ethyl) only partial separation was achieved, while for ethyl, propyl and 2 -pentyl, vinyl pairs no separation was observed.199... 

At sufficiently high penetrant partial pressures in glassy polymers, the onset of plasticization produces the upturn in permeability seen in Fig. 2d. While this behavior is shown for the acetone-ethyl cellulose system, it is also typical of many other systems. In fact, if one extends the pressure range of the measurements in Fig. 2c to 900 psia, an upturn in permeability like that seen in Fig. 2d is observed (29). This response is, therefore, a combination of the dual mode response in Fig. 2c and the plasticization response in Fig. 2b at high sorbed concentrations. 

A. J. D Ambra, M. J. Rice, S. G. Zeller, R R. Gruber, and G. R. Gray, Analysis of positions of substitution of O-methyl or G-ethyl groups in partially methylated or ethylated cellulose by the reductive-cleavage method, Carbohydr. Res., Ill (1988) 111-116. 

Methanol[67-56-l] (methyl alcohol) is a clear, colorless liquid with a characteristic odor. It is hygroscopic and miscible in all proportions with water as well as with many organic solvents. It is less soluble in fats and oils, and is only partially miscible with aliphatic hydrocarbons. Numerous inorganic substances (e.g., many salts) are soluble in methanol. Methanol has a good solvency for polar resins, cellulose nitrate, and ethyl cellulose. However, oil-modified alkyd resins and polymers, with the exception of poly(vinyl acetate), poly(vinyl ethers), polyvinylpyrolidone and polymethacrylamide, are insoluble. 

Ethyl formate [109-94-4] is partially miscible with water. It dissolves cellulose nitrate, cellulose acetate, and many resins. 

Ethyl acetate [79-20-9] is a colorless, neutral liquid that is partially miscible with water and has a pleasant, fruity odor. It has a good solvency for cellulose nitrate, cellulose ethers, chlorinated rubber, poly(vinyl acetate), vinyl chloride copolymers, polyacrylates, polystyrene, fats, oils, and many natural and synthetic resins (alkyd resins, saturated polyesters, ketone resins). Cellulose acetate is, however, dissolved only in the presence of small amounts of ethanol. Poly(vinyl chloride) is insoluble. 

Ethyl triglycol [112-50-5] [2-(2-ethoxyethoxy)ethoxy]ethanol, triethylene glycol monoethyl ether] is an almost colorless, neutral, mild-smelling liquid with a low hygroscopicity. It is soluble in water and most organic solvents, but is only partially miscible with aromatic and aliphatic hydrocarbons. Ethyl triglycol dissolves cellulose nitrate, shellac, colophony, ketone resins, maleate resins, chlorinated rubber, alkyd resins, and many other paint resins. It does not dissolve cellulose acetate, poly(vinyl chloride), vinyl chloride copolymers, fats, oils, and rubber. 

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