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[Chinese Journal of Polymer Science] Highly thermally conductive polydimethylsiloxane composites with controllable 3D GO@f-CNTs networks via self-sacrificing template method
writer:?Shuangshuang Wang, Dianying Feng, Zhiming Zhang, Xia Liu, Kunpeng Ruan, Yongqiang Guo* and Junwei G
keywords:thermally conductive
source:期刊
specific source:Chinese Journal of Polymer Science
Issue time:2024年

Shuangshuang Wang, Dianying Feng, Zhiming Zhang, Xia Liu, Kunpeng Ruan, Yongqiang Guo* and Junwei Gu. Highly thermally conductive polydimethylsiloxane composites with controllable 3D GO@f-CNTs networks via self-sacrificing template method. Chinese Journal of Polymer Science, 2024, 10.1007/s10118-024-3098-4. 2022IF=4.3.(2区化学期刊,中国科技期刊卓越行动计划-梯队期刊类项目)

Abstract

Constructing controllable thermal conduction networks is the key to efficiently improve thermal conductivities of polymer composites. In this work, graphite oxide (GO) and functionalized carbon nanotubes (f-CNTs) are combined to prepare “Line-Plane”-like hetero-structured thermally conductive GO@f-CNTs fillers, which are then performed to construct controllable 3D GO@f-CNTs thermal conduction networks via self-sacrificing template method based on oxalic acid. Subsequently, thermally conductive GO@f-CNTs/polydimethylsiloxane (PDMS) composites are fabricated via casting method. When the size of oxalic acid is 0.24 mm and the volume fraction of GO@f-CNTs is 60 vol%, GO@f-CNTs/PDMS composites present the optimal thermal conductivity coefficient (λ, 4.00 W/(m·K)), about 20 times that of the λ of pure PDMS (0.20 W/(m·K)), also much higher than the λ (2.44 W/(m·K)) of GO/f-CNTs/PDMS composites with the same amount of randomly dispersed fillers. Meanwhile, the obtained GO@f-CNTs/PDMS composites have excellent thermal stability, whose λ deviation is onlyabout 3% after 500 thermal cycles (20~200oC).

可控导热网络的构筑是高效提升导热填料/高分子复合材料导热性能的关键。本文以氧化石墨(GO)和改性碳纳米管(f-CNTs)构筑的“线-面”状异质结构GO@f-CNTs为导热填料,借助草酸为自牺牲模板构筑结构完整、形貌可控的GO@f-CNTs导热网络,经浇注聚二甲基硅氧烷(PDMS)制备GO@f-CNTs/PDMS导热复合材料。结果表明,当草酸粒径为0.24 mm且GO@f-CNTs体积分数为60 vol%时,GO@f-CNTs/PDMS导热复合材料具有最优的导热系数(λ,4.00 W/(m·K)),约为纯PDMS的λ(0.20 W/(m·K))的20倍,也远高于同等GO和f-CNTs用量随机分散的GO/f-CNTs/PDMS导热复合材料的λ(2.44 W/(m·K))。GO@f-CNTs/PDMS导热复合材料兼具优异的导热稳定性,经500次热循环(20~200oC)后其λ的偏差约为3%。