纳米纤维素-蒙脱土块状材料的制备及性能分析

Preparation and Performance Analysis of Nanocellulose-Montmorillonite Block Material

以自制的纤维素纳米晶体(CNC)为主要原料,通过与一定比例的蒙脱土(MMT)和水共混、搅拌、热压制备出了具有一定机械强度的纳米纤维素基块状材料。通过透射电子显微镜(TEM)、扫描电子显微镜(SEM)、原子力显微镜(AFM)及丁达尔效应证明了制备的CNC具有良好的再分散性能。以MMT作为增强剂按照不同的比例添加到CNC中制备得到纳米纤维素-蒙脱土(CNC-MMT)块状材料,采用抗弯曲测试、SEM、接触角测试、吸水性测试和热重(TG)分析考察了CNC-MMT块状材料的弯曲性能、表面形态、亲水性能及热稳定性能。研究表明,当MMT的添加量为30%时,CNC-MMT块状材料的弯曲强度最高为74 MPa,其强度高于普通的商业塑料,且CNCMMT块状材料具有较低的亲水性能及较好的热稳定性能。

The cellulose nanocrystal(CNC)with good redispersion properties were prepared and utilized as the main raw materials,blended with a certain mass of montmorillonite(MMT)and water followed by hot-pressed to prepare the nanocellulose-based bulk materials with high mechanical strength.The tests of transmissionelectron microscope(TEM),scanning electron microscope(SEM),atomic force microscope(AFM)and Tyndall effect have proved the prepared CNC with the excellent re-dispersibility.Montmorillonite(MMT),as a reinforcing agent,was added with CNC powder in different proportions to prepare CNC-MMT composite block materials.Bending resistance test,SEM,contact angle test,water absorption test and thermogravimetric(TG)analysis were used to investigate the bending performance,surface morphology,hydrophilicity and thermal stability of composite materials separately.The results showed that when the content of montmorillonite reached 30%,the bending strength of CNC-MMT was up to 74 MPa,which was higher than that of ordinary commercial plastics.Moreover,CNC-MMT had lower hydrophilic properties and better thermal stability.