Lamellar and hexagonal pattern rearrangements in thin films of polystyrene–block–poly(2-vinyl pyridine) and polystyrene–block–poly(4-vinyl pyridine) copolymers simultaneously exposed to an in-plane AC electric field and saturated chloroform vapor are studied with atomic force microscopy and analyzed via the numerical solution of the self-consistent field theory equations. It is demonstrated that the use of AC field with the root-mean-square strength higher than 8 V⋅μm⁻¹ allows one to effectively orient microphase-separated domains along the field direction on the tens of microns scale. At the same time, the AC field considerably lowers the risk of breakdown and eliminates effects related to ionic transport in the presence of solvent vapor. The role of such factors as the exposure time, field strength and frequency is investigated. Theoretical considerations prove the equivalent effect of AC and DC fields on the structure of the copolymer film in a wide frequency range. Self-consistent field theory calculations of the free energy as a function of film thickness make it possible to exactly identify which phase dominates in the film. In particular, an apparent transformation of standing cylinders into long threads aligned in the field direction should be interpreted as the phase transition from the perpendicular to parallel hexagonal phase, which can take place in a certain range of film thicknesses, provided the electric field strength exceeds a certain threshold value. In the case of a perpendicular lamellar phase, the domain orientation along the direction of the electric field is always profitable. The observed morphological rearrangements under an in-plane field, which preserve connectivity between the film surfaces through the domains of the minor copolymer block, can be important for practical applications.

研究了聚苯乙烯-嵌段-聚（2-乙烯基吡啶）和聚苯乙烯-嵌段-聚（4-乙烯基吡啶）共聚物薄膜的层状和六角形图案重排，同时暴露于面内交流电场和饱和氯仿蒸气中原子力显微镜，并通过自洽场论方程的数值解进行分析。结果表明，使用均方根强度高于 8 V⋅μm ^{−1的交流场}允许人们沿着几十微米尺度的场方向有效地定向微相分离域。同时，交流电场大大降低了击穿风险，并消除了在溶剂蒸汽存在下与离子传输相关的影响。研究了暴露时间、场强和频率等因素的作用。理论上的考虑证明了交流和直流场在很宽的频率范围内对共聚物薄膜结构的等效影响。作为薄膜厚度函数的自由能的自洽场论计算使得可以准确地确定哪个相在薄膜中占主导地位。尤其是，直立圆柱体明显转变为沿场方向排列的长线应解释为从垂直六方相到平行六方相的相变，如果电场强度超过一定阈值，它可以在一定范围的膜厚度内发生价值。在垂直层状相的情况下，沿电场方向的畴取向总是有利的。在面内场下观察到的形态重排，通过次要共聚物嵌段的区域保持薄膜表面之间的连通性，对于实际应用可能很重要。在垂直层状相的情况下，沿电场方向的畴取向总是有利的。在面内场下观察到的形态重排，通过次要共聚物嵌段的区域保持薄膜表面之间的连通性，对于实际应用可能很重要。在垂直层状相的情况下，沿电场方向的畴取向总是有利的。在面内场下观察到的形态重排，通过次要共聚物嵌段的区域保持薄膜表面之间的连通性，对于实际应用可能很重要。