利用丙基唑啉(POZ)对微晶纤维素(MCC)进行化学改性得到酰胺化微晶纤维素(AD-MCC),AD-MCC与聚乳酸(PLA)通过熔融共混法制备AD-MCC/PLA复合材料。利用FT-IR、SEM、XRD、TG、万能试验机等研究了AD-MCC的制备条件,并考察了AD-MCC添加质量分数对AD-MCC/PLA的性能影响。结果表明,在甲醇钠催化下120℃反应8h,可得到POZ接枝率为31.47%的AD-MCC;AD-MCC提高了MCC与PLA的相容性,使PLA力学性能显著提高;添加2.5% AD-MCC可使PLA复合材料的拉伸强度提高26%,断裂伸长率提高61%,冲击强度提高57%。

Microcrystalline cellulose (MCC) is chemically modified with propyloxazoline (POZ) to obtain an amidated microcrystalline cellulose (AD-MCC).AD-MCC/PLA composites are prepared through melt blending of AD-MCC and polylactic acid (PLA).The preparation conditions for AD-MCC are explored by means of Fourier transform infrared spectrometer,scanning electron microscope,X-ray powder diffraction,thermogravimetric analyzer,and universal testing machine.The effect of AD-MCC addition amount on the properties of AD-MCC/PLA is studied.It is shown by the results that AD-MCC with a POZ grafting ratio of 31.47% is obtained after the reaction has performed for 8h at 120℃ under the catalysis of NaOCH₃.AD-MCC improves the compatibility between MCC and PLA,and significantly enhances the mechanical properties of PLA.Compared with pure PLA,the tensile strength,elongation at break and impact strength of AD-MCC/PLA with 2.5%(wt.) of AD-MCC are increased by 26%,61% and 57%,respectively.

王碟(1997-),男,硕士生,研究方向为绿色化学与催化,2843769154@qq.com;单玉华(1965-),男,博士,教授,研究方向为新型催化材料研制,通讯联系人,yhshan@cczu.edu.cn。