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
Synthesis and evaluation of novel polyimides derived from spirobichroman diether anhydride
โ 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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โฆ Synopsis
On page 2807, Table IV, the second column, the T g values of
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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
## Abstract Novel aromatic polyimides were synthesized from 9,10โdihydroโ9,10โ__o__โbenzenoanthraceneโ1,5โdiamine (2,7โtriptycenediamine) and aromatic tetracarboxylic dianhydrides. The polymerization was carried out in a twoโstep procedure including ringโopening polyโaddition giving polyamic acids,