聚(苯乙烯-co-甲基丙烯酸)胶体晶体原位反转制备孔阵列研究

FABRICATION OF ORDERED POROUS ARRAYS THROUGH in situ CONVERSION METHOD USING POLY(STYRENE-co-METHACRYLIC ACID) COPOLYMER COLLOIDAL CRYSTALS

利用甲苯浸泡法,将聚(苯乙烯-co-甲基丙烯酸)(P(Sc-o-MAA))胶体晶体转变成孔阵列,利用扫描电镜和原子力显微镜详细研究了胶体球在向孔转变过程中结构的变化细节,同时利用表面元素分析法检测其反转前后元素含量的变化.结果表明,在选择性溶剂作用下,胶体球经历了溶胀—粘连—破裂—溶解—成孔—扩张等一系列变化,处于内核的聚苯乙烯被溶出胶体球后不仅填充到球与球之间的空隙中而且扩散到了溶剂中,而胶体球表面富集的聚甲基丙烯酸链段与溶出的聚苯乙烯混合物则主要对孔结构起固定和支撑作用,但长时间的甲苯浸泡最终会破坏孔的结构和阵列的完整性.

Poly（styrene-co-methacrylic acid） P（S-co-MAA） copolymer colloidal crystals were transformed to ordered porous arrays by selective dissolution using toluene as solvent.The atomic force microscopy（AFM） and scanning electron microscopy（SEM） were used to characterize the structure change during sphere-pore transforming process,and the AES was used to analyze the element content variety of the colloidal spheres before and after the conversion.The polystyrene core in the P（S-co-MAA） latex nanospheres first swelled,making the colloids conglutination.Then the bursting of the methacrylic acid shell led to it gradually dissolution,resulting in a porous structure.Owing to the liquidity of the macromolecule,the pores formed are irregular rounded.The surface element analysis indicates that when the polystyrenes in core are extracted from the colloidal spheres by solvent,they diffuse into the solvent,not fill in the interspaces among the spheres.In addition,the methacrylic acid riched on the colloidal surface has the function to fix and support the porous structure,but the structure could be ruined with long time immersion.