Emergence and Stability of a Hybrid Lamella–Sphere Structure from Linear ABAB Tetrablock Copolymers,ACS Macro Letters

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Emergence and Stability of a Hybrid Lamella–Sphere Structure from Linear ABAB Tetrablock Copolymers
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-12-29 00:00:00 , DOI: 10.1021/acsmacrolett.7b00818
Bin Zhao ₁ , Wenbo Jiang ₁ , Lei Chen ₁ , Weihua Li ₁ , Feng Qiu ₁ , An-Chang Shi ₂

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The self-assembly of linear A₁B₁A₂B₂ tetrablock copolymers is studied using the self-consistent field theory, aiming to target the formation of stable hybrid structures composed of lamellar and spherical domains of the same component, i.e., the lamella–sphere (LS) phase. Two types of lamellar morphologies, regular (L) and sandwich-like (L′), are observed, and their transition is identified as first-order. The formation of L′ is a prior condition for the formation of LS because the disordered short A₂-blocks sandwiched in the B domain in L′ aggregate into spheres as χN increases, leading to the formation of LS. The separation of A₂-blocks from A₁-blocks in L′ or LS causes extra interfacial energy, which is compensated by the gain of configurational entropy. The tail B₂-block is demonstrated to play a critical role in enlarging the gain of configurational entropy. In a word, the formation of L′ is driven by entropy, while the transition from L′ to LS is driven by enthalpy.

中文翻译：

线性 ABAB 四嵌段共聚物混合薄片-球体结构的出现和稳定性

使用自洽场理论研究线性A ₁ B ₁ A ₂ B ₂四嵌段共聚物的自组装，旨在形成由相同组分的层状和球形域组成的稳定杂化结构，即薄片– 球体 (LS) 阶段。观察到两种类型的层状形态，规则（L）和三明治状（L'），它们的转变被确定为一级。L'的形成是LS形成的先决条件，因为夹在L'中B域中的无序短A _{2 -块随着}χ N的增加聚集成球体，导致LS的形成。A ₂块与 A的分离_{L' 或 LS 中的1} -blocks 会导致额外的界面能量，这可以通过配置熵的增益来补偿。尾部B ₂块被证明在扩大构型熵的增益中起关键作用。总之，L'的形成是由熵驱动的，而从L'到LS的转变是由焓驱动的。

更新日期：2017-12-29

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