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为了改善纳米纤维素晶须(CNC)在非亲水性树脂中应用时分散困难、热分解温度低、与基体相容性较差等缺点,将冷冻干燥的纳米纤维素在高聚物的有机溶液中预先包覆,然后与苯乙烯-丁二烯-丙烯腈树脂(ABS)、马来酸酐接枝聚乙烯在挤出机内熔融共混制成ABS/CNC复合材料。通过扫描电镜(SEM)、热重分析测试(TGA)、拉伸性能测试等手段对复合材料进行性能表征。SEM观察发现CNC是以层状纳米片的形式均匀地与ABS复合;力学性能测试表明,接枝聚乙烯的加入有利于改进CNC与ABS的界面相容性,与纯ABS相比,添加0.7%CNC的复合材料其拉伸强度提高了156%,弹性模量提高了52%。TGA测试结果表明,CNC的热分解温度由211℃提高到263℃,大大改善了CNC在聚合物加工过程中的温度适应性。
In order to improve the dispersion of nanocellulose whisker (CNC) in non-hydrophilic resin, the thermal decomposition temperature is low, and the compatibility with the matrix is poor, the freeze-dried nanocellulose in the organic polymer The solution was pre-coated and then melt-blended with styrene-butadiene-acrylonitrile (ABS) and maleic anhydride grafted polyethylene in an extruder to produce an ABS / CNC composite. The properties of the composites were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and tensile testing. SEM observation shows that CNC is uniformly laminated with ABS in the form of layered nanosheets. The mechanical properties tests show that the addition of grafted polyethylene can improve the interfacial compatibility between CNC and ABS. Compared with pure ABS, 0.7% The tensile strength of CNC composites increased by 156% and the modulus of elasticity increased by 52%. TGA test results show that the thermal decomposition temperature of CNC increased from 211 ℃ to 263 ℃, which greatly improves the temperature adaptability of CNC in polymer processing.