The micro/nanofibrils of poplar were prepared by synergistic treatment of ultrasonic and cellulase. The properties of micro/nanofibrils were characterized by using scanning electron microscopy (SEM), X-ray diffractometer (XRD) and fourier transform infrared spectroscopy (FTIR). The results indicated that poplar micro/nanofibril was the same as natural fiber in chemical composition and crystal structure. The micro/nanofibril distribution diameter was from 50 nm to 1 pm. The crystallity of micro/nanofibrils was 84.99％, increased by 20％ compared to original fiber. The stretching vibration frequencies of -OH of micro/nanofibrils were higher than that of original fiber and cellulase treated fiber, its blue shift phenomena were caused by micro/nanofibrils'quantum effects.%杨木纤维经纤维素酶预处理后,用超声波法制备杨木微/纳纤丝,利用扫描电子显微镜、X射线衍射仪和红外光谱仪对制备的杨木微/纳纤丝进行表征分析.结果表明:纤维素酶可降解纤维素的部分无定形区并能润胀纤维,再用超声波处理能制备出微/纳纤丝,所制备的杨木微/纳纤丝宽度在50 nm-1μM之间;杨木微/纳纤丝保持了天然纤维的晶型,结晶度为84.99%,比原纤维(70.88%)提高了约20%;杨木微/纳纤丝仍具有纤维素的基本化学结构,在波数3400 cm~(-1),附近,杨木微/纳纤丝的红外吸收发生了蓝移现象.
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