Claims
- 1. A method of making an article comprising highly piezoelectric, low void content vinylidene fluoride polymer, having dimensional and piezoelectric stability upon exposure to elevated temperatures, comprising in sequence the steps of stretching the article from an original configuration to an extended configuration; conditioning the article at a temperature between about 20.degree. C. above the stretching temperature and about 15.degree. C. below the crystalline melting point of the vinylidene fluoride polymer while maintaining the article under an applied electric field, under conditions that permit it to recover towards its original configuration; and polarizing the article.
- 2. A method of making an article comprising highly piezoelectric, low void content vinylidene fluoride polymer, having dimensional and piezoelectric stability upon exposure to elevated temperatures, comprising in sequence the steps of stretching the article from an original configuration to an extended configuration; polarizing the article, and conditioning the article at a temperature between about 20.degree. C. above the stretching temperature and about 15.degree. C. below the crystalline melting point of the vinylidene fluoride polymer while maintaining the article under an applied electric field, under conditions that permit it to recover towards its original configuration.
- 3. A method according to claim 1 or claim 2 wherein the vinylidene fluoride polymer is vinylidene fluoride homopolymer.
- 4. A method according to claim 1 or claim 2 wherein the conditioning temperature is about 120.degree. C.
- 5. A method according to claim 1 or claim 2 wherein the conditioning step is performed while maintaining the article under an applied electric field of between about 50 and 150 MV/m.
BACKGROUND OF THE INVENTION
This application is a continuation-in-part of application Ser. No. 649,383, filed Sept. 11, 1984, abandoned, the disclosure of which is incorporated herein by reference.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
649383 |
Sep 1984 |
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