尿素对MCC-纳米SiO_2杂化材料形态、结构及应用的影响

Effects of urea on morphology,structure and application of MCC-SiO_2 hybrid nanomaterials

利用微晶纤维素(MCC)易吸水溶胀的特点,将MCC在尿素水溶液中溶胀,控制吸附在MCC表面和内部尿素水膜的厚度。以此水膜为"微反应器",采用溶胶-凝胶工艺,以正硅酸乙酯为前驱体,在MCC表面和内部生成无机纳米SiO_2颗粒。红外光谱(IR)、热失重(TG)和扫描电镜分析(SEM)表明,纳米级别的SiO_2成功负载在微晶纤维素上。将MCC-纳米SiO_2杂化材料应用于胎面胶中,结果发现,MCC杂化改性后补强性能提高,硫化胶的压缩疲劳温升降低。

Microcrystalline Cellulose（MCC）was swollen in the urea solution based on its water swelling properties,and the thickness of urea layer was controlled to form a＂microreactor＂.Nano-SiO2 particles were generated in the＂microreactor＂and loaded on the surface of MCC by a sol-gel technology using tetraethoxysilane as the precursor.The results of Infrared spectrum（IR）and thermogravimetic analysis（TGA）and scanning electron microscope（SEM）showed that nanosize SiO2 particles had been loaded on the surface of MCC successfully.The hybrid nanomaterials were then used in tire tread compounds and found that it had improved reinforcing efficiency than that of MCC samples,and the vulcanizates had lower compressive temperature-rise.