Synthesis and characterization of novel hydroxyl-terminated NN–bonded resins

✍ Scribed by K. Sridhara; S. R. Jain

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 175 KB
• Volume: 81
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1774

✦ Synopsis

Abstract

Novel resins containing carbonyl or thiocarbonyl moiety; NN bonds; ethereal linkage; and terminal hydroxyl groups, that is, bis(bisvanillincarbonohydrazone‐4′‐oxy)butane 1,4‐diyldiether and bis(bisvanillinthiocarbonohydrazone‐4′‐oxy)butane 1,4‐diyldiether, have been synthesized by condensing bisvanillincarbono‐ and bisvanillinthiocarbono‐hydrazone, respectively, with 1,4‐dibromobutane. The resins were characterized by elemental and hydroxyl equivalent analyses, infrared and ^1^H– and ^13^C–NMR spectra, and other properties relevant to their use as propellant binders, such as calorific value, thermal analysis, viscosity, and burning rate measurements. Both these resins have convenient viscosity, indicating their suitability as binders for processing high solid loading, at slightly above room temperature. The resins could be cured easily with toluene diisocyanate and glycerol. The DTA–TG data show that the cured samples start to decompose exothermically at relatively low temperatures, in the range around 160°C. The resins ignite immediately on coming in contact with pure nitric acid, indicating their hypergolic nature. The burning rates of the ammonium perchlorate–based propellant compositions having these resins as binders are much higher than those processed with a conventional butadiene binder. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 3204–3211, 2001