Starch solution compatibility

The thermodynamic compatibility of biological and synthetic polymers is a common question.993 Beijerinck,994 and Ostwald and Hertel,995 studied the thermodynamic compatibility of proteins and polysaccharides, and the latter authors evaluated the role of the source of starch. In contrast to cereal starches, potato starch is compatible with proteins in both acidic and basic media, whereas, Dahle991 reported that wheat starch sorbs proteins mainly in acidic and neutral solutions. 

Thermodynamic compatibility of the partners of a complex is another condition which must be accounted for in complex formation. Thermodynamically incompatible components separate into two phases. Tolstoguzov et a/.984 studied complexes of starch with gelatin in aqueous solutions and showed that complexation requires adjustment of the solution acidity and... 

Gum Arabic acts as protective colloid and excellent emulsifier and the molecular aggregation can cause both shear thinning and time-dependent thickening behavior at low shear" Gum Arabic has the ability to create a strong protective film around oil droplets" and is compatible with the most other plant hydrocolloids, proteins, carbohydrates, and modified starches. The viscosity of a solution of a mixture of gum arabic and gum tragacanth tends to be lower than that of either constituent solution. 

SAF Safronov, A.P., Tyukova, I.S., and Suvorova, A.I., The nature of thermodynantic compatibility of components of aqueous solutions of starch and cellulose carboxymethyl derivatives, Polym. Sci., Ser. A, 51, 174, 2009. 

In this work, the starch/PVOH/silicate clay blend films were prepared by a solution casting method. Four different types of layered silicate clays were used to investigate the compatibility of multiphased system. Special attention is driven to study the effect of the clay content on the film properties based on barrier and mechanical modeling predictions of nanocomposite films. 

In this work, the effect of four types of clay (untreated montmorillonite Na-MMT, Modified MMT Cloisite lOA and Cloisite 30B, and synthetic Laponite-RD) on properties of starch/PVOH nanocomposite films was evaluated. The results show that compatibility and optimum interactions between polymer matrix, organic modifiers (if any) and the sihcate laj er surface are cracial to the formation of intercalated or exfoh-ated nanocomposite structure. Starch and PVOH are more compatible with Na-MMT and LRD than C30B and CIO A. With the increase of clay content, the clay layers are harder to be dispersed using the solution method. In such case, more mechanical... 

For surface application, first the compatibility with the other chemicals used in the preparation and also the shear stability have to be checked (e. g. with starch, optical brightener, dyes). It is advisable to meter the undiluted polymer by means of a piston pump to the circuit of the size-press, e. g. before the feed pump. To achieve a good effect, the PSA must penetrate sufficiently into the paper, e. g. an adequate quantity of sizing solution must be taken up. Quantities of 2-4 g solid polymer in combination with 40-80 g 1 starch are normally sufficient to achieve a hard sized paper sheet 1-2 g 1 solid polymer is sufficient for final sizing of a paper that has been presized internally. 

Solutions of locust bean gum have a pH between 5 and 7 and are highly viscous like those of guar gum. They behave similarly toward pH changes (stable over pH 3-11), borate ions, and organic solvents. Locust bean gum is compatible with gelatin, starch, and other plant gums (see guar gum). 

Because of their relatively low cost, ready availability, wide compatibility, and excellent adhesive characteristics, many polyvinyl acetate resins, solutions, and emulsions are treated as commodity items by the adhesives industry. Among the many U.S. manufacturers of polyvinyl acetate based resins are the following major producers Air Products, H. B. Fuller, National Starch, Reichhold, Rohm and Haas, Union Carbide, Union Oil, and W. R. Grace. The resulting competition has benefited adhesives formulators with low prices, good qual-... 

The procedure for the preparation of clear CMC solutions follows that of the nonionic cellulose ethers, except for pH conditions. CMC solutions are only stable at pH 7-9. CMC is compatible with a wide range of other food ingredients including protein, sugar, starches and others hydrocolloids. 

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