Nano-titanium dioxide (TiO2 ) was modified with the surfactant sodium laurate (SL) via ultrasonic microwave-assisted technology to improve the dispersion of TiO2 in polymer matrices. As revealed by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy analyses, SL was well adsorbed onto the TiO2 surface through chemical bonding, resulting in SL-modified TiO2 (TiO2 -SLx). The hydrophobicity and dispersibility of TiO2 -SLx increased significantly compared to unmodified nano-TiO2 . With an increase in the SL concentration from 5% to 15%, the agglomeration of TiO2 -SLx particles decreased considerably, while the particles were more uniform. TiO2 -SLx nanoparticles (3 wt%) were then incorporated into acetylated distarch phosphate/chitosan (ADPS/CS) blended matrices to reinforce the biopolymers. Relative to unmodified TiO2 , TiO2 -SLx exhibited a better dispersion capability. Furthermore, as the SL concentration increased, the tensile strength (TS) of the composite films increased, while the elongation at break (E), water vapor permeability (WVP), and solubility all decreased. The composite film containing TiO2 -SL15 (TiO2 modified with 15% SL; ADPS/CS-TiO2 -SL15 film) displayed the highest TS (31.50 MPa), which was 33.70% higher than that of the pure ADPS/CS film, whereas the ADPS/CS-TiO2 -SL25 film exhibited the lowest E. Further, the ADPS/CS-TiO2 -SL15 film displayed the lowest WVP (0.90 × 10-12 g·cm-1 ·s-1 ·Pa-1 ) and solubility (22.91%), which decreased by 30.23% and 26.03% compared to that of the pure ADPS/CS film, respectively. Therefore, SL modification and the use of ultrasonic microwave-assisted technology are promising for the preparation of nanofillers for biopolymer reinforcement. PRACTICAL APPLICATION: Nano-titanium dioxide (TiO2 ) nanoparticles were modified using the anionic surfactant sodium laurate via ultrasonic-microwave assisted technology, to improve the dispersion of the TiO2 nanoparticles in polymer matrices. Modified TiO2 nanoparticles were incorporated into acetylated di-starch phosphate/Chitosan blend films, causing the tensile strength of the composite film to increase and the water solubility and water vapor permeability of the composite film to decrease, making the films suitable for packaging applications.

中文翻译：

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月桂酸钠改性纳米二氧化钛增强乙酰化二淀​​粉磷酸酯/壳聚糖膜：月桂酸钠浓度的影响

通过超声微波辅助技术用表面活性剂月桂酸钠 (SL) 改性纳米二氧化钛 (TiO2)，以改善 TiO2 在聚合物基质中的分散。傅里叶变换红外光谱、X 射线衍射和扫描电子显微镜分析表明，SL 通过化学键很好地吸附到 TiO2 表面，形成 SL 改性的 TiO2（TiO2 -SLx）。与未改性的纳米二氧化钛相比，二氧化钛-SLx 的疏水性和分散性显着增加。随着 SL 浓度从 5% 增加到 15%，TiO2 -SLx 颗粒的团聚显着减少，而颗粒更加均匀。然后将 TiO2 -SLx 纳米颗粒（3 wt%）加入乙酰化磷酸二淀粉/壳聚糖（ADPS/CS）混合基质中以增强生物聚合物。相对于未改性的 TiO2，TiO2-SLx 表现出更好的分散能力。此外，随着SL浓度的增加，复合膜的拉伸强度（TS）增加，而断裂伸长率（E）、水蒸气渗透率（WVP）和溶解度均下降。含有 TiO2 -SL15 的复合膜（用 15% SL 改性的 TiO2；ADPS/CS-TiO2 -SL15 膜）显示出最高的 TS（31.50 MPa），比纯 ADPS/CS 膜高 33.70%，而ADPS/CS-TiO2 -SL25 薄膜表现出最低的 E。此外，ADPS/CS-TiO2 -SL15 薄膜表现出最低的 WVP (0.90 × 10-12 g·cm-1 ·s-1 ·Pa-1 ) 和溶解度(22.91%)，与纯 ADPS/CS 薄膜相比，分别下降了 30.23% 和 26.03%。所以，SL 改性和使用超声波微波辅助技术有望用于制备用于生物聚合物增强的纳米填料。实际应用：采用阴离子表面活性剂月桂酸钠，通过超声-微波辅助技术对纳米二氧化钛（TiO2）纳米颗粒进行改性，以改善纳米二氧化钛（TiO2）纳米颗粒在聚合物基质中的分散性。将改性二氧化钛纳米颗粒掺入乙酰化磷酸二淀粉/壳聚糖共混薄膜中，使复合薄膜的拉伸强度增加，复合薄膜的水溶性和水蒸气渗透性降低，使薄膜适合包装应用。使用阴离子表面活性剂月桂酸钠通过超声-微波辅助技术对纳米二氧化钛 (TiO2) 纳米粒子进行改性，以改善 TiO2 纳米粒子在聚合物基质中的分散。改性二氧化钛纳米粒子被掺入乙酰化磷酸二淀粉/壳聚糖共混薄膜中，使复合薄膜的拉伸强度增加，复合薄膜的水溶性和水蒸气渗透性降低，使薄膜适用于包装应用。使用阴离子表面活性剂月桂酸钠通过超声-微波辅助技术对纳米二氧化钛 (TiO2) 纳米粒子进行改性，以改善 TiO2 纳米粒子在聚合物基质中的分散。将改性二氧化钛纳米颗粒掺入乙酰化磷酸二淀粉/壳聚糖共混薄膜中，使复合薄膜的拉伸强度增加，复合薄膜的水溶性和水蒸气渗透性降低，使薄膜适合包装应用。