纳米微晶纤维素导电薄膜的制备及性能表征

Preparation and Characterization of Conductive Films Based on Nanocrystalline Cellulose

关键词:  纳米微晶纤维素  碳纳米管  导电薄膜  制备  表征

Key Words:nanocrystalline cellulose  carbon nanotube  conductive film  preparation  characterization

摘要:探讨了利用3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPS）改性的多壁碳纳米管（MWCNTs）制备纳米微晶纤维素（NCC）的导电薄膜。首先将NCC溶解在NaOH-尿素-水的混合体系中，然后向该体系添加改性的MWCNTs并经超声分散后刮膜成型，分别利用扫描电子显微镜（SEM）、傅里叶变换红外光谱仪（FT-IR）、X射线衍射仪（XRD）、万能材料试验机、紫外可见分光光度计和电导率仪表征导电薄膜的形貌结构及导电性能。结果表明，经MPS改性后的MWCNTs可在导电薄膜中获得良好的分散性能，当改性MWCNTs质量分数≤6%时，未在导电薄膜内观察到明显的团聚现象；改性MWCNTs的添加对NCC基材的化学结构影响并不明显；当改性MWCNTs质量分数为10%时，导电薄膜的结晶度可提高44.8%，对于波长为200～550 nm的光线吸收能力均明显增强，抗张强度下降57.8%。添加质量分数6%的改性MWCNTs的导电薄膜的电导率可达4.66 mS/cm，但对应的电阻率仅为214.6 Ω·cm。

Abstract:In this study， surface-modified multi-walled carbon nanotubes （MWCNTs） were used to prepare conductive film based on nano crystalline cellulose （NCC）. Firstly the NCC particles were dissolved in the NaOH-urea-water system， then the MWCNTs modified by 3-methacryloxypropyltrimethoxysilane （MPS） were added into the system， finally the mixture system was used to prepare film after ultrasonic dispersing. The conductive films were characterized using scanning electron microscope （SEM）， fourier transform infrared spectroscopy （FT-IR）， X-ray diffraction （XRD）， UV-VIS spectrophotometer， and conductivity meter. The results showed that the MWCNTs modified by MPS dispersed in the NCC films uniformly. Compared with the control group， the chemical structures of NCC film was affected by the surfaced-modified MWCNTs slightly， while the crystallinity of the NCC film contained 10wt% modified MWCNTs was increased by 44.8% and the absorption to the ray between 200 nm and 550 nm was enhanced and the tensile strength was declined by 57.8%. The conductivity of the film reached 4.66 mS/cm and the electrical resistivity was 214.6 Ω·cm when the content of surfaced-modified MWCNTs was 6wt%．