The phase behavior of non-frustrated ABC block copolymers polymers, modeling poly(isoprene-b-styrene-b-ethylene oxide) (ISO), is studied using dissipative particle dynamic (DPD) simulations. The phase diagram showed a wide composition range for the alternating gyroid morphology, which can be transformed to a chiral metamaterial. A quantitative analysis of topology was developed, that correlates the location of a block relative to the interface with the block's end-to-end distance. This analysis showed that the A-blocks stretched as they were located deeper in the A-rich region. To further expand the stability of the alternating gyroid phase, A-selective homopolymers of different lengths were co-assembled with the ABC copolymer at several compositions. Topological analysis showed that homopolymers with lengths shorter than or equal to the A-block length filled the middle of the networks, decreasing packing frustration and stabilizing them, while longer homopolymers stretched across the network but allowed for the formation of stable, novel morphologies. Adding homopolymers to triblock copolymer melts increases tunability of the network, offering greater control over the final stable phase and bridging two separate regions in the phase diagram.

中文翻译：

---

无结块三嵌段共聚物与均聚物的构象和拓扑相关性

聚（异戊二烯-b-苯乙烯-b）建模的非沮丧ABC嵌段共聚物聚合物的相行为-环氧乙烷（ISO），是使用耗散粒子动力学（DPD）模拟进行研究的。相图显示了交替的螺旋状形态的宽组成范围，可以转变为手性超材料。开发了对拓扑的定量分析，其将块相对于接口的位置与块的端到端距离相关联。该分析表明，随着A区块位于A富集区域的更深处，其伸展了。为了进一步扩大交替的螺线管相的稳定性，将具有不同长度的A-选择性均聚物与ABC共聚物以几种组成共组装。拓扑分析表明，长度小于或等于A嵌段长度的均聚物填充了网状结构的中部，从而降低了填料的压实度并使它们稳定，较长的均聚物可延伸穿过网络，但可以形成稳定的新型形态。将均聚物添加到三嵌段共聚物熔体中可增加网络的可调性，从而更好地控制最终的稳定相，并在相图中桥接两个单独的区域。