ISSN:
0360-6376
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
N,N′-(pyromellitoyl)diglycine (1) was synthesized by reacting pyromellitic anhydride with glycine in polar solvents such as DMAC, NMP, or DMF at 60°C and then refluxed azeotropically with toluene. Among these solvents, it is easy to form DMF-insoluble salt (1″) in DMF, but this salt can be converted to 1 by treating first with NaHCO3 and then with HCl. Reacting monomer N,N′-(pyromellitoyl)diaminoacetyl chloride (2) can be obtained by treating with thionyl chloride, and N,N′-(pyromellitoyl)dimethyl aminoacetate (3) can be obtained by treating 2 with methanol. As 2 reacts with aromatic diamine in polar solvents, such as DMAC, DMF, or NMP, a series of copolypyromellitimide amides (5a-h) can be obtained. These copolymers can be processed by using DMAC + LiCl (5%) as solvent to produce flexible film of good weather resistivity and heat resistivity. Monomer 2 can also react with aromatic dihydrazides in polar solvents to produce copolypyromellitimide hydrazides (6a-c), and 6a-b can be condensated again to produce copolypyromellitimide oxadiazoles (7a-b) in polyphosphoric acid (PPA). Besides, 3 reacts with aromatic tetraamine by carrying out polycondensation in PPA to produce copolypyromellitimide benzimidazole (8). Structures of copolymers mentioned above were identified by comparing IR spectra with those of model compounds. Heat resistivity was measured by the thermogravimetric method, and their solubilities in various solvents were also investigated.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1979.170171015
