Distributions of Deuterated Polystyrene Chains in Perforated Layers of Blend Films of a Symmetric Polystyrene -block-poly(methyl methacrylate)

Jia Wen Hong, Yi Qing Jian, Yin Ping Liao, Hsiang Ho Hung, Tzu Yen Huang, Andrew Nelson, I. Yu Tsao, Chun Ming Wu, Ya Sen Sun

研究成果: 雜誌貢獻期刊論文同行評審

摘要

We have examined the spatial distributions of polymer chains in blend films of weakly segregated polystyrene-block-poly(methyl methacrylate) [P(S-b-MMA)] and deuterated polystyrene (dPS). By fine-tuning the composition (φPS+dPS = 63.8 vol %) of the total PS/dPS component and annealing temperature (230 and 270 °C), P(S-b-MMA)/dPS blend films mainly form perforated layers with a parallel orientation (hereafter PLs//). The distributions of dPS in PLs// were probed by grazing-incidence small-angle neutron scattering (GISANS) and time-of-flight neutron reflectivity (ToF-NR). GISANS and ToF-NR results offer evidence that dPS chains preferentially locate at the free surface and within the PS layers for blend films that were annealed at 230 °C. Upon annealing at 270 °C, dPS chains distribute within PS layers and perforated PMMA layers. Nevertheless, dPS chains still retain a surface preference for thin films. In contrast, such surface segregation of dPS chains is prohibited for thick films when annealed at 270 °C.

原文???core.languages.en_GB???
頁(從 - 到)13046-13058
頁數13
期刊Langmuir
37
發行號44
DOIs
出版狀態已出版 - 9 11月 2021

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