一锅法合成Janus纳米片及其对PS/TiO2复合材料的增容作用研究

利用一锅法合成了Janus纳米片（JNSs），通过扫描电子显微镜（SEM）、电致冷X射线能谱仪（EDS）、动态混合流变仪、动态力学热分析仪（DMA）和万能材料试验机等对JNSs的表面形貌和化学成分进行了表征，考察了JNSs对聚苯乙烯/二氧化钛（PS/TiO₂）共混体系流变性能的影响，以及JNSs对PS/TiO₂复合材料动态力学性能、力学性能、表观形貌的影响，并对JNSs对复合材料的界面增容作用机理进行了探讨分析。结果表明，JNSs两面的粗糙程度不同，粗糙凹面含有氨基，光滑凸面含有双键；JNSs用作PS/TiO₂共混体系的相容剂时，能够增强界面作用力，改善无机粒子和有机聚合物的相容性；含0.5 份（质量份，下同）JNSs的PS/TiO₂复合材料的玻璃化转变温度（T_g）从PS的100 ℃提高到了107 ℃；同时，JNSs在外力作用下沿力的方向取向需要耗散能量，使得其拉伸强度较PS/TiO₂提高了13.43 %，断裂伸长率由12 %增加到了18 %。

One Pot Synthesis of Janus Nanosheet and Its Compatibilizating Effect on PS/TiO2 Composites

Janus nanosheets （JNSs） were prepared through one?pot synthesis， and the surface morphology and chemical compositions were characterized using scanning electron microscope and electric cooling X-ray energy spectrometer. The effect of JNSs on the rheological， dynamic mechanical properties and mechanical properties of polystyrene（PS）/TiO₂ blends as well as their morphology were investigated using dynamic hybrid rheometer， dynamic mechanical thermal analyzer and universal material testing machine. The results indicated that the prepared JNSs showed different rough levels on their two sides. The rough concave and smooth convex surfaces were found to contain amino groups and double bonds， respectively. The JNSs can be used as a compatibilizer for the PS/TiO₂ blending system to enhance interfacial interaction， thus improving the compatibility between the inorganic particles and organic polymers. Compared to pure PS， the glass transition temperature of the PS/TiO₂ composites with 0.5 phr JNSs was increased from 100 to 107 °C. Owing to the enhancement of interfacial interaction， the JNSs can dissipate energy in the direction of the force under the action of external force， resulting in an increase in tensile strength by 13.43 %. The elongation at break also increased from 12 % to 18 %.