Nitrocellulose Content

Tensile Strength of Cast Double-Base Powder as a Function of Nitrocellulose Content P 423 Elongation of Cast Double-Base Powder as a Function of Nitrocellulose. Content. .. P 423 Modulus of Elasticity of Cast Double-Base Powder as a Function of 1 1 ... 

Fig 2 Tensile strength of cast double-base powder as function of nitrocellulose content... 

The uniformity of the diameter of the powder tubes is also influenced by different factors. Greater uniformity is obtained with longer dies and an increased number of passages between the rollers. A decrease in the nitrocellulose content to 50% reduces the uniformity of the tube dimensions as does an increase in the centralite content. 

Dry nitrocellulose, which bums rapidly and furiously, may detonate if present in large quantities or if confined. Nitrocellulose is a dangerous material to handle in the dry state because of sensitivity to friction, static electricity, impact, and heat. Nitrocellulose is always shipped wet with water or alcohol. The higher the nitrogen content the more sensitive it tends to be. Even nitrocellulose having 40% water detonates if confined and sufftcientiy activated. AH large-scale processes use nitric—sulfuric acid mixtures for nitration (127—132). 

Fig 12 Change of nitrogen content in nitrocellulose as a function of water concentration in nitrating mixtures according to Miles (Ref 44)... 

Composition of the nitrating mixture, % Composition of the spent acid, % Cellulose to acid ratio 1 j Nitrogen content of nitrocellulose. %... 

Cellulose Chemistry , London (1947), 245—47 22) B.T. Fedoroff, Rapid Method for the Determination of Nitrogen Content of Nitrocellulose by the Ferrous Ammonium Sulphate Method , PACLR 122871 (1948) 23) J. Pearson... 

Use of Sulfur-35 to Characterize the Sulfate Content in Nitrocellulose (NC). Military grades f NC are prepared by nitrating a suitable grade of cellulose, either cotton linters or wood pulp,... 

H.A. Aaronson J.V.R. Kaufman, Characterization of the Sulfate Content in Unstabilized Nitrocellulose , PATR 2107 (1955) 6) S. Helf... 

Pyroxylins. A group of Nitrocelluloses with N content ranging from 10% and less to about 12.65%. The lower N members (see also under Collodion Cotton in Vol 3, C394-R) are used... 

Fig 6 Immunodot-blots of culture-medium aliquots sampled during the time-course of differentiation of Zinnia mesophyll cells to tracheary elements and dotted on to nitrocellulose. I = Inductive medium, N = Non-inductive medium. The JIM 7 epitope dries in a series of concentric rings on the nitrocellulose, indicating a mixed population of pectins. During the time-course, the rhamnose content of inductive culture medium increases dramatically compared with non-inductive medium. 

The nature of the nitrocellulose used is of particular importance in explosives if freedom from exudation of free nitroglycerine during storage is to be avoided. Nitroglycerine is only a poor solvent for nitrocellulose and stability of the gel depends on continuous formation and breakdown of gelled structures. The distribution of nitrogen content and viscosity, even in the individual fibres of the nitrocellulose, is therefore of paramount importance. 

Nitrocellulose is usually handled wet and containing approximately 30% of water. Under these conditions it can be considered as a nonexplosive material when the nitrogen content does not exceed 12-6%. More highly nitrated cellulose is known as guncotton and is explosive even when moderately wet. When dry, nitrocellulose of all types is an extremely sensitive and dangerous explosive. Dry nitrocellulose is required for use in certain types of explosives and is then prepared by slow drying of the wet material in a current of warm air. 

Table 4.2 Heats of formation of nitrocelluloses with varying N content.

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