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首页> 外文期刊>European Polymer Journal >Creation of lateral structures in diblock copolymer thin films during vapor uptake and subsequent drying - Effect of film thickness
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Creation of lateral structures in diblock copolymer thin films during vapor uptake and subsequent drying - Effect of film thickness

机译：蒸气吸收和随后干燥过程中在二嵌段共聚物薄膜中产生侧向结构-膜厚的影响

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摘要

We have studied the structure formation in compositionally nearly symmetric poly(4-octylstyrene-b-butylmethacrylate) diblock copolymer films during exposure to saturated vapor of n-hexane (a poor solvent for both blocks) and subsequent drying using real-time, in situ grazing-incidence small-angle X-ray scattering (GISAXS). Previous bulk studies revealed a lamellar structure after thermo-annealing; and surface studies on hexane treated samples revealed a lateral surface structure (?ernoch et al., 2007) [14]. We focus here on the effect of film thickness which is varied between 1.3 and 2.0 times the bulk lamellar thickness. We report on the lateral repeat distance as well as on the correlation length in the film plane. Complex, non-monotonous behavior is observed for both parameters. Upon drying, the lateral structure created during vapor treatment is stable only for the thick film, not for the intermediate and the thin film. The kinetics depends strongly on the film thickness; especially for the thinnest film, it is very slow. For all film thicknesses, we attempt to identify the most stable morphology, occurring when the inner film structure is close to the one in the bulk.
机译：我们已经研究了在组成成分接近对称的聚（4-辛基苯乙烯-甲基丙烯酸丁酯）嵌段共聚物薄膜中的结构形成过程，该薄膜在正己烷饱和蒸汽（两个嵌段的不良溶剂）中暴露，随后使用实时原位干燥掠入射小角X射线散射（GISAXS）。先前的大量研究表明，热退火后为层状结构。对己烷处理过的样品进行表面和表面研究发现其表面具有横向结构（？ernoch等，2007）[14]。在此，我们重点研究薄膜厚度的影响，该厚度在整体层状厚度的1.3到2.0倍之间变化。我们报告了横向重复距离以及胶片平面中的相关长度。对于这两个参数，都观察到复杂，非单调的行为。干燥后，在蒸汽处理过程中产生的横向结构仅对厚膜稳定，对中间膜和薄膜则不稳定。动力学在很大程度上取决于膜的厚度。特别是对于最薄的薄膜，它非常慢。对于所有膜厚度，我们试图确定最稳定的形态，即内部膜结构接近整体中的结构。

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