Key Laboratory of Molecular Engineering of Polymer, Ministry of Education, and Department of Macromolecular Science, Fudan University, Shanghai, China.
J Phys Chem B. 2011 Jul 7;115(26):8390-400. doi: 10.1021/jp201972n. Epub 2011 Jun 15.
The phase behavior of binary blends of rod-coil diblock copolymers and coil or rod homopolymers is studied by the self-consistent field theory (SCFT). The rod blocks are modeled as wormlike chains and the corresponding SCFT equations are solved using a hybrid method, in which the orientation-dependent functions are discretized on a unit sphere, while the positional space-dependent functions are treated using a spectral method. Phase diagrams of the blends are constructed as a function of the homopolymer volume fraction and phase segregation strength. It is discovered that the phase behavior of the system depends on the flexibility of the homopolymers. The addition of coil-homopolymers stabilizes the smectic phases. Low-molecular weight coil-homopolymers tend to mix with the coil-blocks, whereas high-molecular weight coil-homopolymers are mostly localized at the center of the coil-domains. On the other hand, the addition of rod-homopolymers strongly affects the orientation ordering of the system, leading to transitions between monolayer smectic-C, monolayer smectic-A and bilayer smectic-A phases.
通过自洽场理论（SCFT）研究了棒-线嵌段共聚物与线或棒均聚物的二元共混物的相行为。棒状嵌段被建模为蠕虫状链，并用混合方法求解相应的 SCFT 方程，其中取向相关函数在单位球上离散化，而位置空间相关函数则用谱方法处理。相图作为均聚物体积分数和相分离强度的函数构建。发现系统的相行为取决于均聚物的柔韧性。添加线均聚物稳定了近晶相。低分子量线均聚物倾向于与线嵌段混合，而高分子量线均聚物主要位于线域的中心。另一方面，添加棒状均聚物强烈影响体系的取向有序性，导致单层近晶 C 相、单层近晶 A 相和双层近晶 A 相之间的转变。
