Cellulose tripropionate

Table 9. and Nmr Chemical Shifts, ppm, and Coupling Constants, for Cellulose Triacetate, Cellulose Tripropionate, and Cellulose Tributyrate ... 

Calcium Nitrite 13780-06-8 Cellulose Tripropionate 39320-19-9 Chromic Acid 13530-68-2... 

Cellulose Tripropionate 513-77-9 Barium Carbonate 54972-97-3 Methyl Amyl Alcohol... 

The explanation for this effect (known variously as the gel effect, Tromsdorff effect or auto-acceleration effect) is that the chain termination reaction slows down during conversion and, as can be seen by reference to equations (2.5) and (2.6), a decrease in the termination rate constant leads to an increase in both overall rate and molecular weight. The reason for the drop in termination rate is that as the reaction mixture becomes more viscous the radical ends of the polymer chains find increased difficulty in diffusing towards each other, leading to the important mutual termination reaction. Small monomer molecules on the other hand find little difficulty in diffusion at moderate conversion so that propagation reactions are relatively little affected, until the material becomes semi-soUd, when the propagation rate constant also decreases. It is of interest to note that the gel effect may be induced by the addition of already formed poly(methyl methacrylate) or even another polymer such as cellulose tripropionate because such additions increase the viscosity of the system. 

Cyclohexyl acetate [622-45-7] is very slightly miscible with water, but completely miscible with common organic solvents. Its solvency properties are comparable to those of amyl acetate. Cyclohexyl acetate dissolves oils, fats, resins, waxes, cellulose nitrate, cellulose tripropionate and acetobutyrate, alkyd resins, unsaturated and saturated polyester resins, phenolic resins and aminoplasts, poIy(vinyI chloride), vinyl chloride copolymers, poly(vinyl acetate), poly(vinyl ethers), epoxy resins, and acrylic resins, basic dyes, blown oils, crude rubber, metallic soaps, shellac, and bitumen. 

PMG polymethyiglutamate PDMS polydimethylsiloxane PVA polyvinylalcohol CA cellulose acetate PAN polyacrylonitrile PTFE Polytetrafluoroethylene PVP poly vinylpyrrolidbne SBR styrene-butadiene rubber NBR nitrile-butadiene rubber CTP cellulose tripropionate PAA polyacrylic acid ... 

Various other cellulose esters have been investigated and cellulose tripropionate and the mixed esters, cellulose acetate-propionate and cellulose acetate-butyrate are commercially available. Of these materials, which all have similar properties and applications (see Table 11.5 for some comparative properties), cellulose acetate-butyrate is probably the best known and is described below. These polymers have larger side-chains than cellulose acetate and with equal degrees of esterification, molecular weight and plasticizer content they have lower density and are softer and easier to mould. The larger hydrocarbon side-chain also results in slightly lower water absorption. 

Cellulose acetate hydrogen phthalate Cellulose tripropionate... 

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