两嵌段共聚物在闭合球壳内的相分离  

MICRO PHASE SEPARATION OF DIBLOCK COPOLYMER IN A CLOSED SPHERICAL SHELL

作　　者：许汇[1] 李剑锋[1] 张红东[1] 杨玉良[1] 

机构地区：[1]聚合物分子工程教育部重点实验室复旦大学高分子科学系,上海200433

出　　处：《高分子学报》2011年第5期548-553,共6页Acta Polymerica Sinica

摘　　要：嵌段共聚物所形成特定的空间图样,其微观形态不仅与各组分之间的相互作用以及各组分的含量有关,嵌段的空间受限状况也会对分相形态造成一定的影响.为了研究受限于球壳内的线型AB两嵌段共聚物的相分离行为,构建了适用于闭合球壳空间的Laplace-Beltrami算子,并运用TDGL(time dependent Ginzburg-Landau)介观动力学方程,对在不同尺寸的球壳中发生的相分离行为进行分析,关注的重点是球壳的半径和厚度对微观形态的影响.通过对分相形态和不同组分在球壳内分布的考察表明,随着球壳半径和厚度的增加,高分子链所受到的空间限制减小,其在球壳内的分相形态的规整性随之降低.尤其是在球壳的厚度增加时,非对称线性AB两嵌段共聚物的不同嵌段在球壳内的浓度分布发生明显变化.By using dynamical method based on the TDGL（time dependent Ginzburg-Landau） equation with the rebuilded Laplace-Beltrami operator in a spherical shell,the phase behaviors of linear AB diblock copolymer melt confined in the closed spherical shells have been studied.Our approach has focused on the effects of the shells＇ radius and thickness on the morphology.By analyzing the microscopic phase patterns and the distribution of the components in the shells,we found that with the increasing of the radius and the thickness of the spherical shell,the confinement that polymer chains suffered was reduced and the macroscopic order of morphologies was gradually lost.Especially with the variation of shell thickness,the significant changes of component distribution of two asymmetric blocks within the shell were observed.

关 键 词：闭合球壳 TDGL方程 两嵌段共聚物 

分 类 号：O631.3[理学—高分子化学]