National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Crystallization of High Bulk Density Nitroguanidine.

ADA545344

Publication Date	2011
Personal Author	Mudryy, R.; Damavarapu, R.; Stepanov, V.; Halder, R.
Page Count	18
Abstract	Nitroguanidine (NQ) is an important high explosive widely used as a propellant. Conventionally, NQ is obtained as a long needle or rod shaped crystal that has a very low bulk density and cannot be used in propellant application. In this work, high bulk density NQ was obtained with a bulk density of 0.81 g/mL by controlled cooling of a supersaturated water solution of NQ containing methylcellulose and partially hydrolyzed polyvinyl alcohol (PVA). The dissolved NQ concentration in water solution containing methylcellulose and PVA was measured by following the absorption of infrared spectra, and the supersaturation level was calculated as the difference between the measured dissolved concentration and the solubility, also measured in the present work. Experiments were also conducted to obtain the kinetics of the crystallization. It appears from the experiments on kinetic studies that without the additives, the growth of the crystals in one direction is many times faster than other directions resulting in needle or rod shaped crystals, while the additives restrict the growth in that direction resulting in a more uniform growth in all directions.
Keywords	Nitroguanidine Supersaturation Pyrrolidines Polyvinyl alcohol Reaction kinetics Recrystallization Methylcellulose Hbnq(High bulk density nitroguanidine) Pva(Partially hydrolyzed polyvinyl alcohol) Desupersaturation kinetics Spray drying
Source Agency	Non Paid ADAS
NTIS Subject Category	79A - Ammunition, Explosives, & Pyrotechnics 46D - Solid State Physics 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Army Armament Research, Development and Engineering Center, Picatinny Arsenal, NJ. Energetics Warheads and Manufacturing Technology Directorate.
Supplemental Notes	Technical Report ARMET-TR-10045. Prepared in collaboration with Steven Institute of Technology, Hoboken, NJ. The original document contains color images.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	201124

Crystallization of High Bulk Density Nitroguanidine.

Crystallization of High Bulk Density Nitroguanidine.
ADA545344

Publication Date	2011
Personal Author	Mudryy, R.; Damavarapu, R.; Stepanov, V.; Halder, R.
Page Count	18
Abstract	Nitroguanidine (NQ) is an important high explosive widely used as a propellant. Conventionally, NQ is obtained as a long needle or rod shaped crystal that has a very low bulk density and cannot be used in propellant application. In this work, high bulk density NQ was obtained with a bulk density of 0.81 g/mL by controlled cooling of a supersaturated water solution of NQ containing methylcellulose and partially hydrolyzed polyvinyl alcohol (PVA). The dissolved NQ concentration in water solution containing methylcellulose and PVA was measured by following the absorption of infrared spectra, and the supersaturation level was calculated as the difference between the measured dissolved concentration and the solubility, also measured in the present work. Experiments were also conducted to obtain the kinetics of the crystallization. It appears from the experiments on kinetic studies that without the additives, the growth of the crystals in one direction is many times faster than other directions resulting in needle or rod shaped crystals, while the additives restrict the growth in that direction resulting in a more uniform growth in all directions.
Keywords	Nitroguanidine Supersaturation Pyrrolidines Polyvinyl alcohol Reaction kinetics Recrystallization Methylcellulose Hbnq(High bulk density nitroguanidine) Pva(Partially hydrolyzed polyvinyl alcohol) Desupersaturation kinetics Spray drying
Source Agency	Non Paid ADAS
NTIS Subject Category	79A - Ammunition, Explosives, & Pyrotechnics 46D - Solid State Physics 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Army Armament Research, Development and Engineering Center, Picatinny Arsenal, NJ. Energetics Warheads and Manufacturing Technology Directorate.
Supplemental Notes	Technical Report ARMET-TR-10045. Prepared in collaboration with Steven Institute of Technology, Hoboken, NJ. The original document contains color images.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	201124