AI Article Synopsis
- The study investigates the arrangement of polymer chains in blend films made from polystyrene (PS), deuterated polystyrene (dPS), and poly(methyl methacrylate) (PMMA) under specific conditions.
- It finds that by adjusting the blend composition and annealing temperature, the films primarily form layers with dPS preferentially located at surfaces and within PS layers at 230 °C.
- At 270 °C, dPS still prefers to be near the surfaces in thin films, but this surface segregation is not observed in thicker films.
Article Abstract
We have examined the spatial distributions of polymer chains in blend films of weakly segregated polystyrenepoly(methyl methacrylate) [P(S--MMA)] and deuterated polystyrene (dPS). By fine-tuning the composition (ϕ = 63.8 vol %) of the total PS/dPS component and annealing temperature (230 and 270 °C), P(S--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.
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| http://dx.doi.org/10.1021/acs.langmuir.1c02132 | DOI Listing |
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