Morphology and Phase Diagram of Comb Block Copolymer Am+1(BC)m
Morphology and Phase Diagram of Comb Block Copolymer Am+1(BC)m
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DOI：
10.1021/jp811281t
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发表时间：
2009-05-28
影响因子：
3.3
通讯作者：
Xue, Gi
中科院分区：
文献类型：
--
作者：
Jiang, Zhibin;Wang, Rung;Xue, Gi
用自洽场理论研究了梳形共聚物A（m+1）（BC）（m）的形态和相图。通过改变嵌段的体积分数、嵌段间的相互作用参数和侧链数目，共发现9种相，包括双色片层相、三色片层相、六方点阵相、核壳六方点阵相、两个互穿的四元点阵相、核壳四元点阵相、内部有小球的片层相、小球交替排列的片层相和无序相。绘制了不同侧链数m = 1、2、3和5的A（m+1）（BC）（m）的相图。由于梳形共聚物A（m+1）（BC）（m）的不对称拓扑结构，其相态和相图与线型ABC三嵌段共聚物或星星型ABC三嵌段共聚物有很大不同。当其中一个块体的体积分数占主导地位时，根据哪个块体占主导地位以及块体之间的相互作用，可以形成（核壳）六方相或两个互穿四方晶格。（核壳）六方相容易在嵌段A的角部形成（f（A）>= 0.5）。侧链数目在很大程度上影响相图，这是由于梳形共聚物的结构在三种不同单体之间的交换下不是不变的。由于块B和内部块A（m+1）（BC）（m）的连通性。具有较长主链A或较长侧链和短嵌段C的梳形共聚物，即，较长的嵌段B难以相分离。研究结果有助于设计具有复杂结构的纳米材料或生物材料，或调控梳型共聚物的相行为。
The morphologies and the phase diagram of comb copolymer A(m+1)(BC)(m) are investigated by the self-consistent field theory. By changing the volume fractions of the blocks, the interaction parameters between the different blocks, and the side chain number, nine phases are found, including the two-colored lamellar phase, three-colored lamellar phase, hexagonal lattice phase, core shell hexagonal lattice phase, two interpenetrating tetragonal lattice, core shell tetragonal lattice, lamellar phase with beads inside, lamellar phase with alternating beads, and disordered phase. The phase diagrams are constructed for A(m+1)(BC)(m) with different side chain numbers of m = 1, 2, 3, and 5. Due to the asymmetric topology of comb copolymer A(m+1)(BC)(m) the phases and the diagrams are very different from linear ABC triblock copolymer or star ABC triblock copolymer. When the volume fraction of one of the blocks is the domination, the (core shell) hexagonal phase or two interpenetrating tetragonal lattice can form, depending on which block dominates and the interaction between the blocks. The (core shell) hexagonal phase easily forms at the corner of the block A (f(A) >= 0.5). The side chain number in affects the phase diagram largely due to the fact that the architecture of a comb copolymer is not invariant under the interchange between the three different monomers. Due to the connectivity of the blocks B and the inner blocks A(m+1)(BC)(m). comb copolymers with the longer main chain A or longer side chain with short block C, i.e., longer block B, are difficult to phase separate. The results are helpful to design nano- or biomaterials with complex architecture or tailor the phase behavior of comb copolymers.