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Property Control Of New Fluorinated Copolyimides And Their Applications

Published online by Cambridge University Press:  15 February 2011

S. Sasaki ,
T. Matsuura ,
S. Nishi  and
S. Ando
S. Sasaki
Affiliation:
NTT Applied Electronics Laboratories, 3–9–11, Midori-cho, Musashino-shi, Tokyo, 180, Japan
T. Matsuura
Affiliation:
NTT Applied Electronics Laboratories, 3–9–11, Midori-cho, Musashino-shi, Tokyo, 180, Japan
S. Nishi
Affiliation:
NTT Applied Electronics Laboratories, 3–9–11, Midori-cho, Musashino-shi, Tokyo, 180, Japan
S. Ando
Affiliation:
NTT Applied Electronics Laboratories, 3–9–11, Midori-cho, Musashino-shi, Tokyo, 180, Japan
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Abstract

New fluorinated copolyimides are synthesized with 2,2′-bis(trifluoromethyl)-4,4′- diaminobiphenyl (TFDB) and a mixture of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and pyromellitic dianhydride (PMDA). The thermal expansion coefficient decreases with decreasing 6FDA content, because the hexafluoroisopropylidene group makes the main chain flexible. The refractive index decreases with increasing 6FDA content, because the fluorine content increases. The thermal expansion coefficient can be controlled between -0.5 × 10−5 and 8×10−5 /°C, and the refractive index can be controlled between 1.556 and 1.647 at 589.3 nm, by changing the 6FDA content. The polyimides and copolyimides from TFDB can be used in optical filters because of their high optical transparency and low thermal expansion coefficient. They are expected to be used in optical waveguides because of their high optical transparency and refractive index control.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 227: Symposium J – Materials Science of High Temperature Polymers for Microelectronics , 1991 , 49
Copyright
Copyright © Materials Research Society 1991

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References

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