Construction of three-dimensional network by modified MWCNT and AlN fillings in PVDF to improve the thermal conductivity

doi:10.11949/0438-1157.20211816

Abstract

Abstract:

Based on multi-walled carbon nanotube (MWCNT) and aluminum nitride (AlN) particles with different modification, to improve the dispersion and interfacial compatibility with PVDF matrix, and reduce the interfacial thermal resistance. After solution blending, the mixture of filler and matrix is pressed into a dense film by hot pressing to improve the thermal conductivity of PVDF. By this method a three-dimensional hybrid network structure was expected to be constructed. TEM tests showed that the dispersion property of the modified fillers was improved, and SEM showed that the two fillers successfully formed a three-dimensional hybrid network structure in PVDF matrix. When the filler content is 50%, the thermal conductivity of the a-AlN-PVDF composite film reaches 300% of the original film, and the breaking strength becomes 92% of the original film. When the volume ratio of MWCNT to AlN is 1∶1 and the mass fraction of the modified mixed filler is 50%, the thermal conductivity becomes 565% of the original film and the breaking strength becomes 51% of the original film.

Key words: thermal conductivity, multi-walled carbon nanotubes, aluminum nitride, silane coupling agent

摘要：

通过对多壁碳纳米管(MWCNT)和氮化铝(AlN)颗粒进行不同的改性，提高其分散性以及与聚偏氟乙烯(PVDF)基体的界面相容性，降低界面热阻。通过溶液共混后再用热压法将填料与基体的混合物压制成致密的薄膜，提高PVDF的导热性能。TEM测试证明改性后的填料分散性能提高，SEM证明两种填料成功地在PVDF基体中构成三维杂化网络结构。当填料含量50%时，a-AlN-PVDF复合薄膜的热导率达到原膜的300%、断裂强度变为原膜的92%。当MWCNT与AlN的体积比为1∶1、改性混合填料的质量分数为50%时，热导率变为原膜的565%，断裂强度变为原来的51%。

关键词: 热导率, 多壁碳纳米管, 氮化铝, 硅烷偶联剂

CLC Number:

TQ 327.8

Xingda SHI, Huayan CHEN, Yanan GE, Chunrui WU, Hongyou JIA, Xiaolong LYU. Construction of three-dimensional network by modified MWCNT and AlN fillings in PVDF to improve the thermal conductivity[J]. CIESC Journal, 2022, 73(5): 2262-2269.

石兴达, 陈华艳, 戈亚南, 武春瑞, 贾红友, 吕晓龙. 低界面热阻改性氮化铝和多壁碳纳米管充填PVDF构建杂化三维网络及其导热性能强化[J]. 化工学报, 2022, 73(5): 2262-2269.

Figures/Tables 9

Fig.1 Schematic diagram of APTMS surface modification of AlN particles

Fig.2 Oxidation process of MWCNT

Fig.3 FTIR spectra of unmodified and modified fillers

Fig.4 TEM images of unmodified and modified filler

Fig.5 Section and partial enlarged view of section of 50% AlN-PVDF and a-AlN-PVDF

Fig.6 Surface, cross-section and partial enlarged view of 50% MWCNT-AlN-PVDF and o-MWCNT-a-AlN-PVDF

Fig.7 Thermal conductivity of AlN-PVDF, a-AlN-PVDF, MWCNT-AlN-PVDF, o-MWCNT-a-AlN-PVDF composite films with different filler contents

Fig.8 Thermal conductivity mechanism diagram of MWCNT-AlN-PVDF, o-MWCNT-a-AlN-PVDF composite film

Fig.9 Breaking strength of AlN-PVDF, a-AlN-PVDF, MWCNT-AlN-PVDF, o-MWCNT-a-AlN-PVDF composite films with different filler contents

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