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Synthesis and properties of polyamides based on 5,5?-bis[4-(4-aminophenoxy)phenyl]-hexahydro-4,7-methanoindan

โœ Scribed by Yang, Chin-Ping; Chen, Jyh-An

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
119 KB
Volume
49
Category
Article
ISSN
0959-8103

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โœฆ Synopsis

A new diamine 5,5 '-bis[4-(4-aminophenoxy)phenyl]-hexahydro-4,7-methanoindan (3) was prepared through the nucleophilic displacement of 5,5'-bis(4-hydroxylphenyl)-hexahydro-4,7-methanoindan (1) with p-halonitrobenzene in the presence of K 2 CO 3 in N,N-dimethylformamide (DMF), followed by catalytic reduction with hydrazine and Pd/C in ethanol. A series of new polyamides were synthesized by the direct polycondensation of diamine 3 with various aromatic dicarboxylic acids. The polymers were obtained in quantitative yields with inherent viscosities of 0.76ยฑ1.02 dl g ร€1 . All the polymers were soluble in aprotic dipolar solvents such as N,N-dimethylacetamide (DMAc) and Nmethyl-2-pyrrolidone (NMP), and could be solution cast into transparent, ยฏexible and tough ยฎlms. The glass transition temperatures of the polyamides were in the range 245ยฑ282 ยฐC; their 10% weight loss temperatures were above 468 ยฐC in nitrogen and above 465 ยฐC in air.

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