Cellulose-based binder assisted exfoliation of large-sized boron nitride nanosheets for improved thermal management capability of polymer films

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2024-09-19 DOI:10.1016/j.coco.2024.102094

Zhiqiang Shan , Xiaohua Jia , Jin Yang , Zhaofeng Wang , Haojie Song

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引用次数: 0

Abstract

Boron nitride nanosheets (BNNS) are widely used as fillers for flexible thermal interface materials due to their excellent thermal conductivity and insulating properties. However, the interfacial thermal resistance between the BNNS hinders the rapid transfer of heat from the electronics. Herein, we introduced a cellulose-based “binder” (ENC/CMC) into the ball milling process to assist in the exfoliation of h-BNNS with large-size structures. The micro-scale interfacial friction force and macro-scale mechanical shear stress greatly enhance exfoliation efficiency. The highly dispersed cellulose/h-BNNS dispersions were mixed with an aqueous PVA solution, and densified films were obtained by the sol-gel-film conversion process. Large-sized h-BNNS are uniformly arranged in the cellulose network, resulting in a strong mechanical architecture and continuous thermal conductivity pathways in the PVA matrix. Consequently, the ENC@h-BNNS/PVA-0.75 demonstrated thermal conductivity of up to 2.31 W/mK while achieving maximum tensile strength (168.4 MPa), which were increased by 950 % and 66.6 % over ENC/PVA film and showed excellent flexibility and thermal stability.

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纤维素基粘合剂辅助剥离大尺寸氮化硼纳米片，提高聚合物薄膜的热管理能力

氮化硼纳米片（BNNS）具有出色的导热性和绝缘性，因此被广泛用作柔性热界面材料的填料。然而，氮化硼纳米片之间的界面热阻阻碍了电子器件热量的快速传递。在此，我们在球磨过程中引入了纤维素基 "粘合剂"（ENC/CMC），以帮助具有大尺寸结构的 h-BNNS 剥离。微观尺度的界面摩擦力和宏观尺度的机械剪切应力大大提高了剥离效率。将高度分散的纤维素/h-BNNS分散体与PVA水溶液混合，通过溶胶-凝胶-薄膜转换过程获得致密薄膜。大尺寸的 h-BNNS 均匀地排列在纤维素网络中，从而在 PVA 基体中形成了强大的机械结构和连续的导热通道。因此，ENC@h-BNNS/PVA-0.75，热导率高达 2.31 W/mK，同时达到最大拉伸强度（168.4 MPa），与 ENC/PVA 薄膜相比，分别提高了 950% 和 66.6%，并表现出优异的柔韧性和热稳定性。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.