Yuan Yongbing, Tang Xinyu, Sun Honghong, Shi Junkang, Zhou Congshan, Northwood Derek O, Waters Kristian E, Ma Hao
Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China.
BGRIMM Technology Group, Metallurgical Research and Design Institute, Beijing 100081, China.
Molecules. 2024 Aug 17;29(16):3897. doi: 10.3390/molecules29163897.
In order to regulate the surface properties of calcined kaolinite for the purpose of achieving uniform distribution within various polar dispersion media, 3-aminopropyltriethoxysilane and phenyl glycidyl ether were employed to chemically modify calcined kaolinite. The grafting rate, surface properties, and dispersion properties of calcined kaolinite particles in different polar organic media were changed by varying the dosage of the modifiers. FT-IR analysis confirmed successful surface modification, while thermogravimetric analysis indicated a maximum graft coverage of 18.44 μmol/m for the modified particles. Contact angle measurements and particle size distribution analyses demonstrated the effective adjustment of surface characteristics by the modifiers. Specifically, at a mass ratio of 1.0 of modifier to kaolinite particles, the modified particles exhibited a contact angle of around 125°, achieving uniform dispersion in different polarity media. Particle size distribution ranged from 1600 nm to 2100 nm in cyclohexane and petroleum ether, and from 900 nm to 1200 nm in dioxane, ethyl acetate, and DMF, showcasing a significant improvement in dispersion performance compared to unmodified particles. Concurrently, to improve the mechanical properties of PBAT, modified particles were incorporated into the PBAT matrix, and the effect of modified particle addition on the tensile strength and fracture tensile rate of the composites was investigated. The optimal amount of modified particles is 6 wt.%~8 wt.%. This article aims at synthesizing modifier molecules containing different hydrophilic and hydrophobic groups to chemically graft onto the surface of calcined kaolinite. The hydrophilic and hydrophobic groups on the modified particles can adapt to dispersed systems of different polarities and achieve good distribution within them. The modified particles are added to PBAT to achieve good compatibility and enhance the mechanical properties of the composite material.
为了调节煅烧高岭土的表面性质，以便在各种极性分散介质中实现均匀分布，采用3-氨丙基三乙氧基硅烷和苯基缩水甘油醚对煅烧高岭土进行化学改性。通过改变改性剂的用量，改变了煅烧高岭土颗粒在不同极性有机介质中的接枝率、表面性质和分散性质。傅里叶变换红外光谱（FT-IR）分析证实了表面改性成功，而热重分析表明改性颗粒的最大接枝覆盖率为18.44 μmol/m。接触角测量和粒度分布分析表明改性剂有效地调节了表面特性。具体而言，当改性剂与高岭土颗粒的质量比为1.0时，改性颗粒的接触角约为125°，在不同极性介质中实现了均匀分散。在环己烷和石油醚中，粒度分布范围为1600 nm至2100 nm，在二氧六环、乙酸乙酯和N,N-二甲基甲酰胺（DMF）中，粒度分布范围为900 nm至1200 nm，与未改性颗粒相比，分散性能有显著改善。同时，为了提高聚己二酸/对苯二甲酸丁二醇酯（PBAT）的力学性能，将改性颗粒加入PBAT基体中，并研究了添加改性颗粒对复合材料拉伸强度和断裂拉伸率的影响。改性颗粒的最佳用量为6 wt.%~8 wt.%。本文旨在合成含有不同亲水和疏水基团的改性剂分子，并将其化学接枝到煅烧高岭土表面。改性颗粒上的亲水和疏水基团能够适应不同极性的分散体系，并在其中实现良好的分布。将改性颗粒添加到PBAT中，以实现良好相相容性并提高复合材料的力学性能。
