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區(qū)化學(xué)期刊，中國(guó)科技期刊卓越行動(dòng)計(jì)劃-梯隊(duì)期刊類項(xiàng)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).
可控導(dǎo)熱網(wǎng)絡(luò)的構(gòu)筑是高效提升導(dǎo)熱填料/高分子復(fù)合材料導(dǎo)熱性能的關(guān)鍵。本文以氧化石墨（GO）和改性碳納米管（f-CNTs）構(gòu)筑的“線-面”狀異質(zhì)結(jié)構(gòu)GO@f-CNTs為導(dǎo)熱填料，借助草酸為自犧牲模板構(gòu)筑結(jié)構(gòu)完整、形貌可控的GO@f-CNTs導(dǎo)熱網(wǎng)絡(luò)，經(jīng)澆注聚二甲基硅氧烷（PDMS）制備GO@f-CNTs/PDMS導(dǎo)熱復(fù)合材料。結(jié)果表明，當(dāng)草酸粒徑為0.24 mm且GO@f-CNTs體積分?jǐn)?shù)為60 vol%時(shí)，GO@f-CNTs/PDMS導(dǎo)熱復(fù)合材料具有最優(yōu)的導(dǎo)熱系數(shù)（λ，4.00 W/(m·K)），約為純PDMS的λ（0.20 W/(m·K)）的20倍，也遠(yuǎn)高于同等GO和f-CNTs用量隨機(jī)分散的GO/f-CNTs/PDMS導(dǎo)熱復(fù)合材料的λ（2.44 W/(m·K)）。GO@f-CNTs/PDMS導(dǎo)熱復(fù)合材料兼具優(yōu)異的導(dǎo)熱穩(wěn)定性，經(jīng)500次熱循環(huán)（20~200oC）后其λ的偏差約為3%。
論文亮點(diǎn)
1. 以草酸為自犧牲模板將化學(xué)接枝法制備的GO@f-CNTs異質(zhì)結(jié)構(gòu)導(dǎo)熱填料構(gòu)筑成結(jié)構(gòu)完整、形貌可控的三維GO@f-CNTs導(dǎo)熱網(wǎng)絡(luò)。
2. 當(dāng)草酸粒徑為0.24 mm且GO@f-CNTs體積分?jǐn)?shù)為60 vol%時(shí)，GO@f-CNTs/PDMS導(dǎo)熱復(fù)合材料具有最優(yōu)的導(dǎo)熱系數(shù)（λ，4.00 W/(m·K)），遠(yuǎn)高于同等GO和f-CNTs用量隨機(jī)分散的GO/f-CNTs/PDMS導(dǎo)熱復(fù)合材料的λ（2.44 W/(m·K)）。
3. GO@f-CNTs/PDMS導(dǎo)熱復(fù)合材料的微觀熱傳導(dǎo)有限元模擬揭示了粒徑為0.24 mm的草酸構(gòu)筑的GO@f-CNTs導(dǎo)熱網(wǎng)絡(luò)具有最佳的熱傳導(dǎo)效率。
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