Synthesis and properties of ferroelectric fluoroterpolymers with curie transition at ambient temperature

Tze-chiang Chung, A. Petchsuk

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

This paper discusses a new family of ferroelectric polymorphic fluoroterpolymers comprosed of vinylidene difluoride (VDF), trifluoroethylene (TrFE), and a chloro-containing third monomer, such as chlorodifluoroethylene (CDFE), and chlorotrifluoroethylene (CTFE), which feature relatively narrow molecular weight and composition distributions. The terpolymers were prepared by a bulk reaction process with a low temperature free radical initiator, i.e., the oxidation adducts of trialkylborane and oxygen. The slightly bulky chlorine atom serves as a kink in the polymer chain, which spontaneously alters the chain conformation and crystalline structure. Compared to the corresponding VDF/TrFE copolymer (> 20 mol % of TrFE), the slowly increasing chlorine content (< 8 mol % of termonomer) gradually changes the all-trans (tm>4) chain conformation (β-phase) to tttg+tttg- conformation (γ-phase) without significant reduction of overall crystallinity. The Curie (ferroelectric-paraelectric) phase transition temperature between the mixed ferroelectric β- and γ-phases and paraelectric α-phase (tg+tg- conformation) also gradually reduced to near ambient temperature with very small activation energy. Consequently, the terpolymers show high dielectric constant (> 70), slim polarization hysteresis, and large electrostrictive response (> 4%) at ambient temperature and exhibit common ferroelectric relaxor behaviors with a broad dielectric peak that shifted toward higher temperatures as the frequency increased.

Original languageEnglish (US)
Pages (from-to)7678-7684
Number of pages7
JournalMacromolecules
Volume35
Issue number20
DOIs
StatePublished - Sep 24 2002

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Ferroelectric materials
Conformations
Terpolymers
Chlorine
Temperature
Free radicals
Superconducting transition temperature
Free Radicals
Hysteresis
Polymers
Permittivity
Copolymers
Activation energy
Monomers
Phase transitions
Molecular weight
Polarization
Oxygen
Crystalline materials
Atoms

All Science Journal Classification (ASJC) codes

  • Materials Chemistry

Cite this

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title = "Synthesis and properties of ferroelectric fluoroterpolymers with curie transition at ambient temperature",
abstract = "This paper discusses a new family of ferroelectric polymorphic fluoroterpolymers comprosed of vinylidene difluoride (VDF), trifluoroethylene (TrFE), and a chloro-containing third monomer, such as chlorodifluoroethylene (CDFE), and chlorotrifluoroethylene (CTFE), which feature relatively narrow molecular weight and composition distributions. The terpolymers were prepared by a bulk reaction process with a low temperature free radical initiator, i.e., the oxidation adducts of trialkylborane and oxygen. The slightly bulky chlorine atom serves as a kink in the polymer chain, which spontaneously alters the chain conformation and crystalline structure. Compared to the corresponding VDF/TrFE copolymer (> 20 mol {\%} of TrFE), the slowly increasing chlorine content (< 8 mol {\%} of termonomer) gradually changes the all-trans (tm>4) chain conformation (β-phase) to tttg+tttg- conformation (γ-phase) without significant reduction of overall crystallinity. The Curie (ferroelectric-paraelectric) phase transition temperature between the mixed ferroelectric β- and γ-phases and paraelectric α-phase (tg+tg- conformation) also gradually reduced to near ambient temperature with very small activation energy. Consequently, the terpolymers show high dielectric constant (> 70), slim polarization hysteresis, and large electrostrictive response (> 4{\%}) at ambient temperature and exhibit common ferroelectric relaxor behaviors with a broad dielectric peak that shifted toward higher temperatures as the frequency increased.",
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Synthesis and properties of ferroelectric fluoroterpolymers with curie transition at ambient temperature. / Chung, Tze-chiang; Petchsuk, A.

In: Macromolecules, Vol. 35, No. 20, 24.09.2002, p. 7678-7684.

Research output: Contribution to journalArticle

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