Functionalized Aluminum Nitride for Improving Hydrolysis Resistances of Highly Thermally Conductive Polysiloxane Composites

IF 26.6 1区 材料科学 Q1 Engineering
Mukun He, Lei Zhang, Kunpeng Ruan, Junliang Zhang, Haitian Zhang, Peng Lv, Yongqiang Guo, Xuetao Shi, Hua Guo, Jie Kong, Junwei Gu
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Abstract

A series of divinylphenyl-acryloyl chloride copolymers (PDVB-co-PACl) is synthesized via atom transfer radical polymerization employing tert-butyl acrylate and divinylbenzene as monomers. PDVB-co-PACl is utilized to graft on the surface of spherical aluminum nitride (AlN) to prepare functionalized AlN (AlN@PDVB-co-PACl). Polymethylhydrosiloxane (PMHS) is then used as the matrix to prepare thermally conductive AlN@PDVB-co-PACl/PMHS composites with AlN@PDVB-co-PACl as fillers through blending and curing. The grafting of PDVB-co-PACl synchronously enhances the hydrolysis resistance of AlN and its interfacial compatibility with PMHS matrix. When the molecular weight of PDVB-co-PACl is 5100 g mol−1 and the grafting density is 0.8 wt%, the composites containing 75 wt% of AlN@PDVB-co-PACl exhibit the optimal comprehensive performance. The thermal conductivity (λ) of the composite is 1.14 W m−1 K−1, which enhances by 20% and 420% compared to the λ of simply physically blended AlN/PMHS composite and pure PMHS, respectively. Meanwhile, AlN@PDVB-co-PACl/PMHS composites display remarkable hydrothermal aging resistance by retaining 99.1% of its λ after soaking in 90 °C deionized water for 80 h, whereas the λ of the blended AlN/PMHS composites decreases sharply to 93.7%.

以丙烯酸叔丁酯和二乙烯基苯为单体,采用原子转移自由基聚合法制备了一系列二乙烯基苯基-丙烯酰氯共聚物(PDVB-co-PACl)。利用PDVB-co-PACl接枝在球形氮化铝(AlN)表面制备功能化AlN (AlN@PDVB-co-PACl)。然后以聚甲基氢硅氧烷(PMHS)为基体,以AlN@PDVB-co-PACl为填料,通过共混和固化制备导热AlN@PDVB-co-PACl/PMHS复合材料。PDVB-co-PACl接枝同时增强了AlN的抗水解能力和与PMHS基质的界面相容性。当PDVB-co-PACl的分子量为5100 g mol−1,接枝密度为0.8 wt%时,含有75% AlN@PDVB-co-PACl的复合材料综合性能最佳。复合材料的导热系数λ为1.14 W m−1 K−1,与单纯物理混合AlN/PMHS复合材料和纯PMHS相比分别提高了20%和420%。同时,AlN@PDVB-co-PACl/PMHS复合材料在90℃去离子水中浸泡80 h后λ仍保持99.1%,表现出优异的水热老化性能,而AlN/PMHS复合材料的λ急剧下降至93.7%。
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来源期刊
Nano-Micro Letters
Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
32.60
自引率
4.90%
发文量
981
审稿时长
1.1 months
期刊介绍: Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.
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