Tartaric Acid Modified BT to Enhance the Thermal Conductivity and Dielectric Properties of PP Composites

doi:10.19491/j.issn.1001-9278.2021.04.006

Abstract

Abstract:

The three?phase composite materials based on polypropylene （PP）， nano-alumina （Al₂O₃） and the bernary barium titanate （BT） modified with tartaric acid were prepared and their structure and performance were characterized by Fourier transform infrared spectrometer， scanning electron microscope， dielectric spectrometer and thermal conductivity analyzer. The results indicated that the surface modification for BT particles effectively improved the compatibility of PP with BT， Al₂O₃ and other inorganic fillers， promoting the uniformity of BT， Al₂O₃ and other particles dispersed in the PP matrix. As a result， the thermal conductivity and dielectric properties of the composites was improved simultaneously. The three-phase composites presented an increase in thermal conductivity from 0.90 to 1.24 at a PP\BT\Al₂O₃ volume ratio of 5\4\1. Their relative dielectric constant at 100 Hz also increased from 18 to 21.2， but their dielectric loss decreased from 0.055 to 0.035. The dielectric properties of composites exhibited a good temperature stability with a dielectric constant?temperature coefficient of -124×10^?6 °C^?1 in the temperature range of 25~130 °C， and their dielectric constant-temperature coefficient decreased by 62.8 % in comparison with the unmodified composites.

Key words: tartaric acid, polypropylene, barium titanate, thermal conductivity, dielectric property

CLC Number:

TQ 325.1⁺4

YAO Junlong, WANG Xinrui, HU Li, JIANG Xueliang, YOU Feng, ZHOU Min. Tartaric Acid Modified BT to Enhance the Thermal Conductivity and Dielectric Properties of PP Composites[J]. China Plastics, 2021, 35(4): 30-34.

Figures/Tables 6

Fig.1. FTIR spectra of tartaric、BT particle and modified BT particle

Fig.2. Diagram of the complexation

Fig.3. SEM of PP/Al2O3/BT composite and modified PP/ Al2O3/BT composite（×10 000）

Fig.4. Thermal conductivity of PP/Al2O3/BT and modified PP/Al2O3/BT composites with different volume ratio of Al2O3 to BT

Fig.5. Dielectric properties of PP/Al2O3/BT and modified PP/Al2O3/BT composites upon different frequencies at room temperature

Fig.6. Dielectric properties of PP/Al2O3/BT and modified PP/Al2O3/BT composites at different temperature at 1 000 Hz

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