Comparative study of unsaturated halo and nonhalo polyesters and inhibition of double-base rocket propellants

✍ Scribed by J. P. Agrawal; K. S. Kulkarni

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 671 KB
• Volume: 50
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1993.070500920

✦ Synopsis

Unsaturated halo and nonhalo polyesters, based on tetrachlorophthalic anhydride, tetrabromophthalic anhydride, and phthalic anhydride with diethylene glycol and maleic anhydride, have been synthesized, using a "2-step'' polyesterification process. These were mixed with 35% styrene monomer and 0.02% hydroquinone. The structural aspects of halo and nonhalo polyesters have been studied by IR and NMR. Further, these polyesters have been characterized for various properties. A comparison of various properties suggests that tensile strength, bond strength, heat resistance, flame retardance, gel time, and oxygen index follow the order as BP-35 > CP-35 > NHP-35, whereas the order for other properties, such as exotherm peak temperature, thermal conductivity, % elongation, and nitroglycerine absorption, is BP-35 < CP-35 < NHP-35. Variation in the properties of cured halo and nonhalo polyesters has been discussed in terms of structural considerations. The nature of P-t profile of inhibited double-base ( D B ) rocket propellants on static evaluation suggests that CP-35 is a potential inhibitor for DB propellants.