POSS纳米复合物链运动的固体NMR研究  

A Solid-State NMR Study on the Segmental Motion of Polyhedral Oligomeric Silsequi-Oxane(POSS) Nanocomposites

作　　者：邹琴[1,2] 申万岭[1] 高秀枝[1] 邓风[1] 

机构地区：[1]波谱与原子分子物理国家重点实验室 武汉磁共振中心(中国科学院武汉物理与数学研究所),湖北武汉430071 [2]中国科学院研究生院,北京100049

出　　处：《波谱学杂志》2012年第2期248-257,共10页Chinese Journal of Magnetic Resonance

基　　金：国家自然科学基金资助项目(20933009)

摘　　要：利用固体NMR技术、并结合TEM技术研究了POSS掺杂到不同聚合物体系后POSS复合物的链段运动及结构特点,其中聚合物包括聚甲基丙烯酸正丁酯(PBMA)和聚甲基丙烯酸甲酯(PMMA).实验结果表明:POSS能很好的分散在这2种聚合物中,形成纳米结构的复合物;其中POSS在PBMA中形成的复合物表现出较强的链段运动性,而在PMMA中则表现出较低的运动性;同时,2D HETCOR的结果表明这2种聚合物本身结构特点不同,POSS/PBMA复合物中聚合物部分与POSS部分间的距离较近,而在POSS/PMMA中则较远.The segmental motions of two nanocomposites, in which polyhedral oligomeric silsequi-oxane （POSS） is respectively copolymerized with n-butyl methacrylate （BMA） and methyl methacrylate （MMA）, were investigated by solid state NMR techniques in combination with transmission electron microscopy （TEM）. The results indicated that the POSS molecules are thoroughly dispersed in the two polymer matrix. The POSS/PMMA and POSS/PBMA nanocomposites showed a homogenous structure with almost one component, and the segmental motions more constrained in the POSS/PMMA nanocomposite than the POSS/PBMA nanocomposite. The 2D HETCOR results in dicated the distance between the polymer and POSS unit is shorter in the POSS/PBMA nanocomposite than in the POSS/PMMA nanocomposite.

关 键 词：固体核磁共振(solid—state NMR) 链运动 弛豫时间 POSS纳米复合物 

分 类 号：O482.53[理学—固体物理]