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Synthesis and evaluation of novel polyimides derived from spirobichroman diether anhydride

โœ Scribed by Sheng-Huei Hsiao; Ching-Yen Yang


Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
62 KB
Volume
36
Category
Article
ISSN
0887-624X

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โœฆ Synopsis


On page 2807, Table IV, the second column, the T g values of


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A spirobichroman structure-containing diether anhydride (SBCDA), 6,6bis(3,4-dicarboxyphenoxy)-4,4,4,4,7,7-hexamethyl-2,2-spirobichroman dianhydride, was prepared by the nucleophilic nitrodisplacement of 4-nitrophthalonitrile with the phenolate ion of 6,6-dihydroxy-4,4,4 ,4,7,7-hexamethyl-2,2 -spirob

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A novel spirobichroman unit containing dietheramine, 6,6-bis(4-aminophenoxy)-4,4,4,4,7,7-hexamethyl-2,2 -spirobichroman ( 3), was prepared by the nucleophilic substitution of 6,6-dihydroxy-4,4,4 ,4,7,7-hexamethyl-2,2 -spirobichroman with p-chloronitrobenzene in the presence of K 2 CO 3 followed by h

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## Abstract Novel aromatic polyimides were synthesized from 9,10โ€dihydroโ€9,10โ€__o__โ€benzenoanthraceneโ€1,5โ€diamine (2,7โ€triptycenediamine) and aromatic tetracarboxylic dianhydrides. The polymerization was carried out in a twoโ€step procedure including ringโ€opening polyโ€addition giving polyamic acids,