Abstract

Acetylated cellulose nanocrystals (ACNC) were prepared by surface modifying cellulose nanocrystals (CNC) with acetic anhydride (AA). By adding ACNC into biodegradable poly(butylene succinate-co-butylene adipate) (PBSA), ACNC/PBSA composites were prepared via a melt blending method. The structure and morphology of the ACNC were analyzed by Fourier transform infrared (FTIR) spectroscopy, wide angle X-ray diffraction (WAXD) analysis, field emission scanning electron microscopy (FE-SEM) and contact angle measurements. The results showed that the CNC were successfully modified by acetic anhydride, while maintaining their original nanosize rod shape of CNC and showing obvious hydrophobicity. SEM images of the ACNC/PBSA composites indicated that the ACNC were homogeneously dispersed in the composites. With increasing ACNC content, the crystalinity, melt viscosity and decomposition starting temperature increased gradually. In addition, the tensile strength of the ACNC/PBSA composites showed a maximum value at a ACNC content of 3.0%, which was 26.3% higher than for pristine PBSA but the elongation at break was 20% lower than for pristine PBSA.

摘要

通过用乙酸酐（AA）对纤维素纳米晶体（CNC）进行表面改性来制备乙酰化纤维素纳米晶体（ACNC）。通过添加入ACNC可生物降解的聚（亚丁基琥珀酸盐助己二酸丁二酯（PBSA），ACNC / PBSA复合材料是通过熔融共混法制备的。通过傅立叶变换红外（FTIR）光谱，广角X射线衍射（WAXD）分析，场发射扫描电子显微镜（FE-SEM）和接触角测量来分析ACNC的结构和形态。结果表明，CNC成功地被乙酸酐改性，同时保持了其原来的纳米尺寸的棒状CNC并显示出明显的疏水性。ACNC / PBSA复合材料的SEM图像表明ACNC均匀分散在复合材料中。随着ACNC含量的增加，结晶度，熔体粘度和分解起始温度逐渐升高。此外，ACNC / PBSA复合材料的拉伸强度在ACNC含量为3.0％时显示出最大值，