brief introduction

15
Structures and Phases of ferroelectric polymers Xiaojing Zhu Supervisor: Mike John Reece Emiliano Bilotti

Transcript of brief introduction

Page 1: brief introduction

Structures and Phases of ferroelectric polymers

Xiaojing ZhuSupervisor: Mike John Reece

Emiliano Bilotti

Page 2: brief introduction

Outlines• Structures and Phases of PVDF

– α phase– αII(δ) phase– β phase– γ phase

• Phases of P(VDF/TrFE)

Page 3: brief introduction

TT (all-trans)β-PVDFLT-P(VDF/TrFE)

TG+TG- (trans-gauche)α-PVDF

TTTTG+TTTG- (T3G+T3G-)γ-PVDFHT-P(VDF/TrFE)

Conformation of PVDF

Page 4: brief introduction

Conformation of PVDF from C axis

Fig. Crystal structures of PVDFK.Tahiro et al., Phase Trans, Vol. 18,217(1989)

Page 5: brief introduction

α Phase

arrows indicate the dipole direction normal to carbon chains

A.J.Lovinger. Ferroelectric Polymers. Science, Vol220:1116(1983)

Page 6: brief introduction

αII (δ) Phase

A.J.Lovinger. Ferroelectric Polymers. Science, Vol220:1116(1983)

Page 7: brief introduction

β Phase

F

Figure. β phase structure

Fig2. CF2 group zigzags

A.J.Lovinger. Ferroelectric Polymers. Science, Vol220:1116(1983)Ferroelectric Polymer Book

Page 8: brief introduction

γ Phase

Page 9: brief introduction

K.Tahiro et al., Phase Trans, Vol. 18,217(1989)

Conformation of PVDF from a-b plane

Page 10: brief introduction

Process of PVDF

Form I β Form III γ

Form II α

Form IIp δ

MeltSolution

high-temperature annealing

high-pressure quenching

casting from DMA

slow cooling

slow cooling

drawing

casting from HMPTA casting from

acetone

polingpoling

high-temperature annealing

drawing

Fig. Interconversion between crystal modificationsK.Tahiro et al., Phase Trans, Vol. 18,217(1989)

Page 11: brief introduction

Phase diagram for VDF/TrFE ratio copolymer(○:melting point;●:crystallization point, Δ:Curie point on heating; :Curie point on ▲cooling; □:ferroelectric-to-anti-ferroelectric transition point)

T. Furukawa .Advances in Colloid and Interface Science.71-72.183-208(1997)

Copolymer P(VDF/TrFE)

Page 12: brief introduction

Phases of P(VDF/TrFE)

Page 13: brief introduction

TT IR Spectra

100

60

40

20

0

80

1400 1200 1000 800 600 400Wavenumber/cm-1

Tran

smiss

ion/

%

Fig. infrared spectra of PVDF forms I and III

1280840

510

445

K.Tahiro et al., Phase Trans, Vol. 18,217(1989)

Page 14: brief introduction

TGTG- in IR Spectra

100

60

40

20

0

80

1400 1200 1000 800 600 400Wavenumber/cm-1

Tran

smiss

ion/

%

Fig. infrared spectra of PVDF forms II and III

796

776 610 532

K.Tahiro et al., Phase Trans, Vol. 18,217(1989)

Page 15: brief introduction

T3G+T3G- IR Spectra

100

60

40

20

0

80

1400 1200 1000 800 600 400Wavenumber/cm-1

Tran

smiss

ion/

%

Fig. infrared spectra of PVDF forms cast III and III

1134

1115

811

K.Tahiro et al., Phase Trans, Vol. 18,217(1989)


Brief introduction of Stronfaith

Brief introduction of Stronfaith

A Brief Introduction to Cryptography - Parshuram …parshurambudhathoki.weebly.com/uploads/3/8/0/2/38024669/...A Brief Introduction to Cryptography Parshuram Budhathoki Assistant Professor

A Brief Introduction to Cryptography - Parshuram …parshurambudhathoki.weebly.com/uploads/3/8/0/2/38024669/...A Brief Introduction to Cryptography Parshuram Budhathoki Assistant Professor

Brief introduction of aLeaves (mainly in Japanese)

Brief introduction of aLeaves (mainly in Japanese)

Brief Introduction of HuaFeng

Brief Introduction of HuaFeng

Social media in Sri Lanka: A brief introduction

Social media in Sri Lanka: A brief introduction

A Brief Introduction to Brownian Motion on a Riemannian ... · A Brief Introduction to Brownian Motion on a ... These lecture notes constitute a brief introduction to stochastic analysis

A Brief Introduction to Brownian Motion on a Riemannian ... · A Brief Introduction to Brownian Motion on a ... These lecture notes constitute a brief introduction to stochastic analysis

2002-10-17. Brief Introduction of LAMOST Brief Introduction of BADC Virtual Observatory of China VO-oriented LAMOST.

2002-10-17. Brief Introduction of LAMOST Brief Introduction of BADC Virtual Observatory of China VO-oriented LAMOST.

Brief Introduction to NLOGIT

Brief Introduction to NLOGIT

brief introduction of Tiantian

brief introduction of Tiantian

Brief introduction

Brief introduction

Brief Introduction to H/W Design - AKABlog | Be The …blog.akaon.com/wp-content/uploads/2015/04/Brief...Brief Introduction to H/W Design Table of Contents • Circuit Elements •

Brief Introduction to H/W Design - AKABlog | Be The …blog.akaon.com/wp-content/uploads/2015/04/Brief...Brief Introduction to H/W Design Table of Contents • Circuit Elements •

Human-Computer Interaction - A Brief Introduction

Human-Computer Interaction - A Brief Introduction

A brief introduction to Machine Learning

A brief introduction to Machine Learning

A Brief Introduction of Speech Lesson 1 .

A Brief Introduction of Speech Lesson 1 .

A Brief Introduction to Patanjali's Yoga sutra

A Brief Introduction to Patanjali's Yoga sutra

Brief introduction to Henrik Christophersen

Brief introduction to Henrik Christophersen

Brief Introduction to MetroQuest

Brief Introduction to MetroQuest

A Brief Introduction of BFOPay

A Brief Introduction of BFOPay

Shekru Deck Brief Introduction मराठी.

Shekru Deck Brief Introduction मराठी.

SDR Hardware and Fault Treatment Brief Introduction

SDR Hardware and Fault Treatment Brief Introduction