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Synthesis and properties of aromatic polyimides derived from 2,2,′3,3′-biphenyltetracarboxylic dianhydride

✍ Scribed by Yuejin Tong; Wenxi Huang; Jun Luo; Mengxian Ding

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
211 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

2,2,Ј3,3Ј-Biphenyltetracarboxylic dianhydride (2,2,Ј3,3Ј-BPDA) was prepared by a coupling reaction of dimethyl 3-iodophthalate. The X-ray single-crystal structure determination showed that this dianhydride had a bent and noncopolanar structure, presenting a striking contrast to its isomer, 3,3,Ј4,4Ј-BPDA. This dianhydride was reacted with aromatic diamines in a polar aprotic solvent such as N,Ndimethylacetamide (DMAc) to form polyamic acid intermediates, which imidized chemically to polyimides with inherent viscosities of 0.34 -0.55 dL/g, depending on the diamine used. The polyimides from 2,2,Ј3,3Ј-BPDA exhibited a good solubility and were dissolved in polar aprotic solvents and polychlorocarbons. These polyimides have high glass transition temperatures above 283°C. Thermogravimetric analyses indicated that these polyimides were fairly stable up to 500°C, and the 5% weight loss temperatures were recorded in the range of 534 -583°C in nitrogen atmosphere and 537-561°C in air atmosphere. All polyimides were amorphous according to X-ray determination.

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