Oxypropylated cellulose

Cellulose, hydroxypropyl ether E463 hyprolose Klucel Methoceh, Nisso HPC oxypropylated cellulose. 

Synonyms Cellulose, 2-hydroxypropyl ether HPC Hydroxypropyl ether of cellulose Hyprolose Oxypropylated cellulose Definition Partially substituted poly(hydroxypropyl) ether of cellulose Properties Off-wh. gran, powd., odorless, tasteless sol. in cold water, methanol, ethanol, many polar org. soivs. insol. in water > 37.7 C ... 

Synonyms Cellulose, 2-hydroxypropyl ether HPC Hydroxypropyl ether of cellulose Hyprolose Oxypropylated cellulose... 

Sugar beet pulp, Cork, Chitin, Chitosan, Olive pits. Polyurethane foams. Partial oxypropylation. Total oxypropylation. Cellulose fibres. Starch granules. Single-component composites... 

Hydroxypropyl celllulose is also known as cellulose, hydroxypropyl ether E463 hydroxypropyl cellulosum hyprolose Klucel Nisso HPC and oxypropylated cellulose. 

The extension of these principles to molecules and macromolecules based on renewable resources has been applied to polymer chemistry and technology, mostly in two areas requiring viscous materials, namely (i) the preparation of liquid polyols to be used in the manufacture of polyurethanes, and (ii) the synthesis of macromol-ecular rheology modifiers. A typical polyol for the synthesis of polyurethane foams is obtained industrially from the oxypropylation of sorbitol, [3] whereas hydroxypropyl cellulose represents a major commodity for the rheological control of paints, foodstuff, cosmetics, etc. [4]. 

All the above systems require a sequence of steps and the use of solvents to attain the final goal, which complicates the process both in toms of economical and ecological soundness. The direct transformation of cellulose fibres into self-reinforced composites by partial oxypropylation was considered a promising alternative to this working hypothesis since it eliminated the use of solvents and could be conducted in a straightforward one-step operation. The study of this system confirmed its viabOity and produced interesting composite materials [20]. 

A different approach was recently applied to cellulose fibres and starch granules to prepare single-component composites by the partial oxypropylation of these substrates. These novel materials are described in Chapter 12. 

We already mentioned in Section 3.5 [70] the partial oxypropylation of cellulose fibres and the interest of the ensuing composite materials in which the unmodified fibre cores represent the reinforcing elements and their thermoplastic sleeves the source of a matrix. Other interesting approaches have been recently put forward to prepare composite materials in which cellulose or one of its derivatives prepared in situ are the only component. Glasser was the first to tackle this problem through the combination of cellulose esters and fibres by two distinct approaches, viz. (i) the incorporation of lyocell fibres into a cellulose acetate matrix [92] and (ii) the partial esterification of wood pulp fibres with -hexanoic anhydride in an organic medium [93] that produced thermally deformable materials in which the thermoplastic cellulose ester constituted the matrix and the unmodified fibres the reinforcing elements. 

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