Study on Thermal Conductivity of Carbon Nanotube Dispersion Strengthened PVDF Composite Film

doi:10.19491/j.issn.1001-9278.2021.07.004

Abstract

Abstract:

Carbon nanotubes （CNTs） were modified with dopamine （DA） and 3?aminopropyl?trimethoxysilane （APTMS），and then a solvent casting method was used to prepare poly（vinylidene fluoride）（PVDF） composite films with excellent thermomechanical properties. The microscopic morphology， crystallinity， thermal properties and mechanical properties were characterized by means of scanning electron microscope， transmission electron microscope， differential scanning calorimeter， X?ray photoelectron spectrometer， thermal constant analyzer， and electronic single yarn strength meter. The results indicated that the DA?APTMS?co?decorated CNTs （PDA?CNTs?NH₂） exhibited good dispersion properties. The addition of PDA?CNTs?NH₂ was benefical to improve the thermal stability of PVDF composite films. The thermal conductivity and mechanical properties of the PVDF/PDA?CNTs?NH₂ composite films were significantly enhanced compared to the pure PVDF and PVDF/CNTs composite films. Under a loading of 8 wt.% PDA?CNTs?NH₂ filler， the composite films achieved a thermal conductivity of 0.337 9 W/（m·K） and tensile strength of 52.67 MPa， increasing by 78 % and 36 % compared to pure PVDF film， respectively.

Key words: poly（vinylidene fluoride）, composite film, dispersion, thermal conductivity, mechanical property

CLC Number:

TQ 327

WU Chaoting, CHEN Huayan, ZHANG Wenxin, LYU Xiaolong. Study on Thermal Conductivity of Carbon Nanotube Dispersion Strengthened PVDF Composite Film[J]. China Plastics, 2021, 35(7): 25-31.

Figures/Tables 10

Fig.1. Preparation of PDA? CNTs?NH2

Fig.2. SEM and TEM images of CNTs before and after modification

Fig.3. XPS spectrum of PDA?CNTs?NH2

Fig.4. Dispersion of CNTs and PDA?CNTs?NH2

Fig.5. SEM images of cross?sectional structure of PVDF composite film

Fig.6. DSC curves of PVDF composite film

样品	T_m/℃	T_c/℃	ΔH_m/J·g^-1	X_c/%
PVDF	171.9	142.7	55.23	53.65
0.5?PVDF/PDA?CNTs?NH₂	172.1	143.0	56.61	55.07
1?PVDF/PDA?CNTs?NH₂	172.5	143.4	56.29	55.03
2?PVDF/PDA?CNTs?NH₂	173.1	144.1	56.35	55.53

Tab. 1. Phase change temperature and crystallinity of PVDF composite films

Fig.7. Tensile strength of PVDF composite films with different filler contents

Fig.8. Thermal conductivity and its enhancement of PVDF composite film

Fig.9. Thermal conductivity mechanism diagram of PVDF composite film

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