阳离子化纤维素/改性氮化硼纳米片复合纸的制备和导热性能研究

Preparation and Thermal Conductivity Study of Cationic Cellulose/Modified Boron Nitride Nanosheet Composite Paper

关键词:  阳离子纤维素，3-氯-2-羟丙基三甲基氯化铵，氮化硼纳米片，复合纸

Key Words:Cationic cellulose  3-chloro-2-hydroxypropyl trimethyl ammonium chloride  boron nitride nanosheets  Composite Paper

摘要:纤维素纸是柔性可降解的二维材料，在新型可穿戴器件等领域研究广泛，但纸导热系数低，加填氮化硼纳米片（BNNS）后可改善其导热性。然而直接加填BNNS存在留着率低且分布不均匀、难以形成大量导热通路的问题，因此所得纸张导热系数较小。本研究采用阳离子化纤维素纸浆（CMCF）结合壳寡糖改性氮化硼纳米片（COSBNNSs），利于导热通路的形成。利用3-氯-2-羟丙基三甲基氯化铵和木浆纤维素反应制备阳离子化纤维，壳寡糖辅助六方氮化硼球磨制备COSBNNSs。COSBNNSs通过静电吸附，物理吸附等作用留着在基材（CMCF）中。当COSBNNSs添加量达到30 %时，所获得CMCF/COSBNNSs复合纸达到最高导热率2.07 W/m*K，抗张强度30 MPa，机械强度和热导率较高，具有作为热管理基材的潜力。

Abstract:Cellulose paper is a flexible and biodegradable two-dimensional material widely studied in fields such as novel wearable devices. However, its thermal conductivity is low, which can be improved by adding boron nitride nanosheets (BNNS). Directly incorporating BNNS presents challenges such as low retention rates and uneven distribution, making it difficult to establish sufficient thermal conduction pathways, resulting in a lower thermal conductivity for the paper. In this study, cationic cellulose pulp (CMCF) was combined with chitosan-modified boron nitride nanosheets (COSBNNSs) to facilitate the formation of thermal conduction pathways. Cationic cellulose was prepared by reacting 3-chloro-2-hydroxypropyl trimethyl ammonium chloride with wood pulp cellulose, while COSBNNSs were synthesized using chitosan-assisted ball milling of hexagonal boron nitride. COSBNNSs were retained in the substrate (CMCF) through electrostatic and physical adsorption. When the content of COSBNNSs reached 30%, the resulting CMCF/COSBNNSs composite paper achieved a maximum thermal conductivity of 2.07 W/m*K and a tensile strength of 30 MPa, demonstrating high mechanical strength and thermal conductivity, thus showing potential as a thermal management substrate.