介孔SBA-15有机化修饰对PMMA杂化材料力学性能的影响

采用硅烷偶联剂对SBA-15进行了有机化修饰(即:SBA-15-G),利用在位分散聚合法制备了SBA-15/PMMA和SBA-15-G/PMMA杂化材料,研究了SBA-15和SBA-15-G在PMMA基体中的介观有序性和分散性以及对杂化材料的力学性能的影响规律。结果表明有机化修饰使SBA-15孔容、孔径和比表面积减小,表面亲油性提高;SBA-15和SBA-15-G在基体中仍保持长程有序结构;有机化修饰改善了SBA-15在基体中的分散性和与基体的界面结合,显著增强了杂化材料的力学性能。当SBA-15-G为4%时,杂化材料的拉伸强度和模量分别提高了45%和40.4%,当SBA-15-G为2%时冲击强度达到最大,比基体提高了36.6%。,

Organic modification of mesoporous SBA-15 and its effect on mechanical properties of PMMA hybrid materials

Silane coupling agent was added onto the mesoporous interior surface of SBA-15 via post-synthesis grafting and SBA-15-G was obtained.The SBA-15/PMMA and SBA-15-G/PMMA hybrid materials were prepared via in situ polymerization.The influences of silane coupling agent modification and content of SBA-15 on the mesoscopic orderliness,disperse properties and mechanical properties were investigated.The results revealed that SBA-15-G exhibited smaller pore volume,pore size and surface area,better lipophilicity,SBA-15 and SBA-15-G still maintained their long- range order in the matrix and the organic modification improved the dispersibility and the interface bonding to the matrix,so the mechanical properties of the hybrid materials were enhanced.The nano-porous channels of SBA-15 and SBA-15-G were not destroyed in hybrid materials.Compared with the matrix,the tensile strength and elasticity modulus of the hybrid materials were increased by 45% and 40.4%,respectively,when the mass fraction of SBA-15-G was 4%;the impact strength was the highest （increasing by 36.6%） when SBA-15-G was 2%.