سنتز و شناسایی دیمریل ایزوسیانات (DDI) با استفاده از روش نوآرایی کورتیوس

Rostami, Arash; taghizadeh, mohammad javad

Volume 18, Issue 2 (9-2023) مواد پرانرژی 2023, 18(2): 89-97 | Back to browse issues page

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Rostami A, taghizadeh M J. سنتز و شناسایی دیمریل ایزوسیانات (DDI) با استفاده از روش نوآرایی کورتیوس. مواد پرانرژی 2023; 18 (2) :89-97
URL: http://isaem.ir/article-1-1479-en.html

سنتز و شناسایی دیمریل ایزوسیانات (DDI) با استفاده از روش نوآرایی کورتیوس

Arash Rostami

, Mohammad javad Taghizadeh ^*

Faculty of Organic Chemistry Group, Department of Basic Sciences, Imam Hossein University, Tehran, Iran , mohammadjavadtaghizadeh31@yahoo.com

Abstract: (153 Views)

Dimeryl diisocyanate (DDI), one of the most frequently used isocyanate curing agents for propellant, DDI is used to cure solid propellants based on HTPB. Diisocyanates are used as a curing agent in HTPB-based composite solid propellant systems. In this study, a three-step process for optimizing the effects of numerous parameters in the manufacture of dimeryl diisocyanate (DDI) was used. In the first step, the reaction with ethanol at a temperature of 85 degrees Celsius led to the preparation of the dimer ester compound with a yield of 99%. In the following stage, high temperatures and no solvent are used to combine the produced dimer ester with hydrazine hydrate to create dimer hydrazide. In the third stage, acyl azide is produced using sodium nitrite, and the target product is produced with a 90% yield using a high-temperature Curtius rearrangement. The product obtained by this method does not have the disadvantages of the phosgene method.

Keywords: Dimeryl Diisocyanate (DDI), Sodium Azide, Dimer Acid, Curtius Rearrangement.

Full-Text [PDF 1668 kb] (19 Downloads)

Type of Study: Research | Subject: پیشرانه
Published: 2024/03/30