Multiwalled carbon nanotube (MWCNT) and cationic cellulose nanofibril (CCNF) were used to prepare electrothermal films. The mechanical properties, thermal stability, and electric heating performance were investigated by experimental testing and numerical analysis. The results showed that the MWCNT were well dispersed in CCNF matrix. Thermal stability of film was improved, and the maximum decomposition rate was reached at 318 °C. The electrical conductivity increases rapidly after the MWCNT content exceeds 20 wt%, and the electrical conductivity varied from 5.8 × 10⁻⁴ S cm⁻¹ and 13.66 S cm⁻¹ with 10–60 wt% MWCNT, the electrothermal films showed strong nonlinearity between I–V and P–V. For the film with 60 wt% MWCNT, the maximum electric power was 3.57 W. The maximum temperature was 93.4 °C and the temperature increased by 279.7% compared with 20% MWCNT content at an applied voltage of 12 V. The average characteristic growth time constant and heat transferred by radiation and convection were 37.24 s and 35.17 mW °C⁻¹, respectively. Therefore, the electrothermal films have a shorter heating parameter and lower electric power consumption as well as excellent thermal cycling stability.

多壁碳纳米管（MWCNT）和阳离子纤维素纳米原纤维（CCNF）被用来制备电热薄膜。通过实验测试和数值分析研究了其力学性能、热稳定性和电加热性能。结果表明，MWCNT在CCNF基体中分散良好。提高了薄膜的热稳定性，在318℃时达到最大分解速率。MWCNT 含量超过 20 wt% 后，电导率迅速增加，电导率从 5.8 × 10 ^-4 S cm ^-1到 13.66 S cm ^-1不等使用 10-60 wt% MWCNT 时，电热膜在 I-V 和 P-V 之间表现出很强的非线性。对于含有 60 wt% MWCNT 的薄膜，最大电功率为 3.57 W。在 12 V 的施加电压下，最高温度为 93.4 °C，温度比含有 20% MWCNT 的薄膜增加了 279.7%。 平均特征生长时间通过辐射和对流传递的常数和热量分别为 37.24 s 和 35.17 mW °C ^-1。因此，电热膜具有更短的加热参数和更低的电能消耗以及优异的热循环稳定性。