In Situ Characterization of the Self-Assembly of a Polystyrene-Polydimethylsiloxane Block Copolymer during Solvent Vapor Annealing
In Situ Characterization of the Self-Assembly of a Polystyrene-Polydimethylsiloxane Block Copolymer during Solvent Vapor Annealing
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DOI：
10.1021/acs.macromol.5b02174
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发表时间：
2015-12-08
期刊：
影响因子：
5.5
通讯作者：
Ross, C. A.
中科院分区：
文献类型：
--
作者：
Bai, W.;Yager, K. G.;Ross, C. A.
在甲苯正庚烷混合溶剂蒸气中，用掠入射X射线散射跟踪了高相互作用参数圆柱形16 kg/m ol聚苯乙烯-b-聚二甲基硅氧烷嵌段共聚物薄膜在室温溶剂退火过程中的微相分离。当溶胀比大于1.2时，薄膜出现微相分离现象，但当溶胀比大于1.9时，薄膜出现无序现象。薄膜在退火过程中表现出与厚度相关的微区重新取向，由于择优表面相互作用，最初的面外柱面取向转变为面内取向。干燥导致离面圆柱体间距减小，较慢的干燥导致更大的消胀和更大的六方晶格扭曲。
Grazing incidence X-ray scattering was used to follow the microphase separation during room-temperature solvent annealing of films of high interaction parameter cylinder-forming 16 kg/mol polystyrene-b-polydimethylsiloxane block copolymer in a toluene heptane mixed solvent vapor. Microphase separation was observed for swelling ratios above 1.2, but swelling ratios above 1.9 caused the films to disorder. The films exhibited a thickness-dependent microdomain reorientation during annealing, with the initial out-of-plane cylinder orientation converting to an in-plane orientation as a result of preferential surface interactions. Drying led to a reduction in the out-of-plane cylinder spacing, with slower drying leading to greater deswelling and larger distortion of the hexagonal lattice.