发明名称 |
Semicrystalline ferroelectric fluoropolymers and process for preparing same |
摘要 |
A new class of ferroelectric terpolymers having an exceptionally large electrostrictive response (>3%) induced by external electric field at ambient temperature comprise 50-80 mole % of vinylidene fluoride (VDF), 15-40 mole % of trifluoroethylene (TrFE) and 2-20 mole % of at least one bulky monomer, such as chlorotrifluoroethylene (CTFE) or hexafluoropropene (HFP). These semicrystalline terpolymers behave like a ferroelectric relaxor having a rapid electric field-induced mechanical response, due to a low Curie temperature (phase transition between polar and nonpolar crystalline domains at or near ambient temperature) and high dielectric constant. A combination of bulk polymerization and free radical polymerization using oxidation adducts of an organoborane as the free radical initiator may be used to prepare the terpolymers, such that the terpolymers are characterized by good processibility, high purity and uniform molecular structure.
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申请公布号 |
US6355749(B1) |
申请公布日期 |
2002.03.12 |
申请号 |
US20000730088 |
申请日期 |
2000.12.05 |
申请人 |
THE PENN STATE RESEARCH FOUNDATION |
发明人 |
CHUNG TZE-CHIANG;PETCHSUK ATITSA |
分类号 |
C08F214/22;(IPC1-7):C08F214/22;C08F214/24;C08F214/26;C08F214/28 |
主分类号 |
C08F214/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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