Non-isothermal Crystallization Behaviors of N,N,N',N'-Tetraphenylbenzidine (TPB)

Non-isothermal Crystallization Behaviors of N,N,N',N'-Tetraphenylbenzidine (TPB)

Reporter ： Xiaosi MaTutor ： Prof. Shirong Wang

School of chemical engineering and technology, Tianjin University, China

Outline

1

2

3

Introduction

Results and Disscusion

Conclusion

1 Introduction

thin and light

flexional

wide viewing angle

low operating voltage

fast response

self-luminous

high luminous efficiency

1 Introduction

1 Introduction

high mobility

good film forming ability

appropriate energy level of

HOMO and LUMO

high thermal stability

Hole transporting materials

1 Introduction

Carbazole derivatives Pyrazoline derivatives Hydrazone derivatives

Styrene derivatives Triphenylamine derivatives

N

NNN NN N

NN N

N NN

Result

2 Results and Discussion

80 100 120 140 160 180

100 120 140 160 180

0

1

2

Hea

t Flo

w (W

/g)

Temperature (°C)

20 /min℃

Exot

herm

al

Temperature (°C)

5 /min℃7.5 /min℃

10 /min℃

15 /min℃

20 /min℃

30 /min℃

Fig. 1 The cold crystallization curves of TPB

Jeziorny method

2 Results and Discussion

-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0-4

-3

-2

-1

0

1

2

5 /min℃ 7 /min℃ 10 /min℃ 15 /min℃ 20 /min℃ 30 /min℃

ln[-l

n(1-X t

)]

ln t

Φ/(oC•min-1) 5 7.5 10 15 20 30

n 3.39 4.23 3.75 2.85 3.39 3.23

Zc 0.96 1.00 1.01 1.03 1.05 1.09

Fig. 2 The Avrami curves of TPB

Tab. 1 The Jeziorny parameters of TPB

Avrami equationln[- ln(1- Xt)] = ln Zt + nln

t

Jeziorny equationln Zc = ln Zt /Φ

Ozawa method

2 Results and Discussion

1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4

-4

-3

-2

-1

0

1

2

X t

ln Φ

125 ℃

126 ℃

127 ℃

128 ℃

129 ℃130 ℃131 ℃132 ℃ 133 ℃

135 ℃137 ℃

T/oC 128 129 130 131 132 133

K 17 77 161 276 424 788

m 1.51 1.89 2.01 2.06 2.08 2.18

Fig. 3 The Ozawa curves of TPB

Tab. 2 The Ozawa parameters of TPB

Ozawa equation

ln[-ln(1-Xt)]=lnK–mlnΦ

Mo method

2 Results and Discussion

-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.01.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

10% 30% 50% 70% 90%

ln Φ

ln t

relative crystallinity（ %） 10 30 50 70 90

F(T) 4.53 6.75 8.33 9.68 11.82

Fig. 6 The Mo curves of TPB

Tab. 3 The Mo parameters of TPB

Mo equation

lnΦ = ln F(T) -αln t

XRD

2 Results and Discussion

100 120 140 160 180 200

0

1

2

Hea

t Flo

w (W

/g)

Temperature (°C)

cold crystallization peak

exothermic peak

20 oC/min

0 5 10 15 20 25 30 35 40 45

2 θ (°)

TPB sample

cold crystallization at 160 oC

cold crystallization at 130 oC

Fig. 7 The DSC curve of TPB Fig. 8 The XRD patterns of TPB

3 Conclusion

2

2

1

The nucleation type is affected by the heating rate

The crystallization rate of TPB increases with the heating rate

Acknowledgment

Financial Support

13

National Natural Science Found-ation of China (21176180) 

National High Technology Research and Development Program of China (2012AA030607)

Thanks for your

attention！