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Di(hydroxyphenyl)- 1,2,4-triazole monomers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1993 |
| Description | The di(hydroxyphenyl)- 1,2,4-triazole monomers were first synthesized by reacting bis (4-hydroxyphenyl) hydrazide with aniline hydrochloride at 250 C in the melt and also by reacting 1,3 or 1,4-bis- (4-hydroxyphenyl)- phenylene- dihydrazide with 2 moles of aniline hydrochloride in the melt. Purification of the di(hydroxyphenyl)- 1,2,4-triazole monomers was accomplished by recrystallization. Poly (1,2,4-triazoles) (PT) were prepared by the aromatic nucleophilic displacement reaction of di(hydroxyphenyl)- 1,2,4-triazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds. The reactions were carried out in polar aprotic solvents such as sulfolane or diphenylsulfone using alkali metal bases such as potassium carbonate at elevated temperatures under nitrogen. This synthetic route has provided high molecular weight PT of new chemical structure, is economically and synthetically more favorable than other routes, and allows for facile chemical structure variation due to the availability of a large variety of activated aromatic dihalides. |
| File Size | 430886 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940018602 |
| Archival Resource Key | ark:/13960/t9q28tt7k |
| Language | English |
| Publisher Date | 1993-09-14 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Phenyls Aniline Hydrochlorides Chemical Reactions Hydroxyl Compounds Synthesis Chemistry Hydrazides Carbonates High Temperature Potassium Monomers Sulfones Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
