【摘要】 近年来柔性电子器件发展迅速，但是尚缺乏高效的热管理材料。本文以膨胀石墨作为高导热基体，以天然纳米纤维素作为粘合剂，制备了用于柔性热管理的复合薄膜，并研究了2种不同的纳米纤维素制备方法对薄膜性能的影响。结果表明，TEMPO氧化法制得的纳米纤维素对应的复合薄膜的强度和韧度分别是超声剥离法制得薄膜的15倍和14倍，而不同的制备方法对复合薄膜的热导率几乎没有影响。TEMPO氧化法制得的复合薄膜同时具有高热导率(16.32 W·m^-1·K^-1)、高强度（110 MPa）和高韧度(1.09 MJ·m^-3)，是理想的柔性热管理材料。更多还原

【Abstract】 In recent years,?exible electronic devices have developed rapidly,but there is still a lack of e?cient thermal management materials.In this paper,expanded graphite was adopted as the matrix of high thermal conductivity,and natural cellulose nano?ber was used as the binder to prepare composite?lms for?exible thermal management.The results showed that the strength and toughness of the composite?lms prepared by the TEMPO oxidation method were 15 and 14 times that of the?lms prepared by the ultrasonic stripping method,respectively,while the different preparation methods had little effect on the thermal conductivity of the composite?lms.The composite?lms prepared by TEMPO oxidation method own high thermal conductivity (16.32 W·m^-1·K^-1),high strength （110 MPa） and high toughness (1.09 MJ·m^-3) simultaneously,making it a prospective thermal management material for?exible electronic devices.更多还原