Increasing the viscosity by means of cross-linking

There exist instances where an increase in the viscosity of nitrocellulose solutions is recommended as in the product intended for manufacture of blasting gelatine, i.e. for the solution of nitrocellulose nitroglycerine. The solution must have the consistency of firm gelatine. 

Another interesting cross-linking was obtained by Kreshkov, Guretskii and Andryanov [39a]. They reacted tetra-alkoxysilanes with nitrocellulose to obtain a reaction with free OH groups. 

The product is highly resistant towards acids. It possesses high thermal resistance and good dielectric properties. 

More important from the practical point of view is the discovery of Fordham, W. H. Marshall and Browne [40] that dihydroxydimethyl urea, commonly known 

Among other substances capable of cross-linking di-isocyanates, e.g. hexamethyl-ene di-isocyanate, OCN—(CH —NCO, should be mentioned. It also reacts with free HO groups to form carbamic esters. 

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Cross-linking t Increasing the viscosity by means of cross-linking) Hydrolysis and denitration Other reactions... 

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