超声协同TEMPO氧化纳米纤维素膜的制备及表征

Preparation and Characterization of Ultrasonic and TEMPO Oxidized Nanocellulose Films

为了探究超声时间对纳米纤维素膜性能的影响,并提高其附加值,本文采用TEMPO-NaBr-NaClO催化氧化体系配合超声波的机械作用制备了氧化纳米纤维素(TOCN)薄膜。并利用傅立叶红外光谱分析(FTIR)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、微力学试验机等对纳米纤维素膜的化学结构、微观形貌及力学性能进行分析。结果表明:与未超声相比,随着超声时间的增加,可使得TOCN薄膜的表面结构更加光滑且致密;当超声时间达到40 min时,薄膜的力学强度达到71 MPa,同时透光率也达到了90%左右。

In order to explore the effect of the ultrasonic time on the performance of the nanocellulose membranes,and to improve its added value.In this paper,the TOCN films were prepared by using the TEMPO-NaBr-NaClO catalytic oxidation system combined with the mechanical action of the ultrasonic wave.The chemical structure,microstructure,and mechanical properties of the nanocellulose membrane were analyzed by using the Fourier infrared spectroscopy(FTIR),scanning electron microscopy(SEM),X-ray diffraction(XRD),and micromechanics testing machine.The results showed that compared with the non-ultrasonic group,the microstructure of the TOCN thin film was more compact with the increase of the ultrasonic time.When the ultrasonic time reached 40 minutes,the mechanical strength of the film reached 71 MPa,and the light transmittance also reached about 90%.