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Efficient construction of boron nitride network in epoxy composites combining reaction-induced phase separation and three-roll milling
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.compositesb.2020.108232
Cong Gao , Zihao Zhu , Yucai Shen , Tingwei Wang , Dong Xiang

Self-construct of filler network was developed to enhance the thermal conductivity of epoxy based composites. The selective distribution of hexagonal boron nitride (hBN) particles in epoxy/PES blends and enhanced dispersion of hBN were successfully obtained by reaction-induced phase separation (RIPS) and three-roll milling (TRM), respectively. The agglomeration of hBN particles in epoxy composite was significantly decreased by three-roll milling, and this was also supported by micromechanics theory, resulting in the construction of the highly efficient filler network. Compared with conventional epoxy/hBN composites and epoxy/PES/hBN composites prepared by mechanical stirring, the epoxy/PES/hBN composites fabricated by three-roll milling showed a great enhancement in thermal conduction and impact strength. The thermal conductivities of the epoxy/PES/hBN composites fabricated by three-roll milling reached 0.52 W/mK at a loading of 10 wt% hBN, which is almost 2.6 times that of the neat epoxy, 40.5% and 26.8% higher than that of epoxy/hBN composites and epoxy/PES/hBN composites without three-roll milling, respectively. Furthermore, the micron-size hBN has a greater advantage for thermal transfer in comparison with boron nitride nanosheets (BNNS). This study provides a readily scalable production method which allows for exfoliation of BN fillers as well as in situ construction of filler networks in thermosetting resin with an environmental friendly route.



中文翻译:

结合反应诱导相分离和三辊研磨的环氧树脂复合材料高效构建氮化硼网络

开发了填料网络的自构建体,以增强环氧基复合材料的导热性。分别通过反应诱导相分离(RIPS)和三辊研磨(TRM)成功地获得了六方氮化硼(hBN)在环氧树脂/ PES共混物中的选择性分布和增强的hBN分散性。三辊研磨显着降低了环氧树脂复合材料中hBN颗粒的团聚,这也得到了微力学理论的支持,从而构建了高效的填料网络。与传统的环氧/ hBN复合材料和通过机械搅拌制备的环氧/ PES / hBN复合材料相比,通过三辊磨制法制备的环氧/ PES / hBN复合材料的导热性和冲击强度都有很大提高。通过三辊研磨制备的环氧/ PES / hBN复合材料的热导率在10 wt%hBN的负载下达到0.52 W / mK,几乎是纯环氧的2.6倍,分别比纯环氧树脂高40.5%和26.8%。分别进行三辊研磨的环氧/ hBN复合材料和环氧/ PES / hBN复合材料的制备。此外,与氮化硼纳米片(BNNS)相比,微米级hBN在热传递方面具有更大的优势。这项研究提供了一种易于扩展的生产方法,该方法可以剥离BN填料,并采用环保的方法在热固性树脂中原位构建填料网络。分别比不进行三辊研磨的环氧/ hBN复合材料和环氧/ PES / hBN复合材料高8%。此外,与氮化硼纳米片(BNNS)相比,微米级hBN在热传递方面具有更大的优势。这项研究提供了一种易于扩展的生产方法,该方法可以剥离BN填料,并采用环保的方法在热固性树脂中原位构建填料网络。分别比不进行三辊研磨的环氧/ hBN复合材料和环氧/ PES / hBN复合材料高8%。此外,与氮化硼纳米片(BNNS)相比,微米级hBN在热传递方面具有更大的优势。这项研究提供了一种易于扩展的生产方法,该方法可以剥离BN填料,并采用环保的方法在热固性树脂中原位构建填料网络。

更新日期:2020-07-14
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