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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)13046-13058
Number of pages13
JournalLangmuir
Volume37
Issue number44
DOIs
StatePublished - 9 Nov 2021

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