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 8 h 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.
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