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- W2034819557 endingPage "1464" @default.
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- W2034819557 abstract "The effect of block copolymers on the interfacial tension σ was investigated for poly(ethylene oxide) (PEO)/poly(dimethylsiloxane) (PDMS) and for PDMS/polystyrene (PS). With PEO/PDMS the additives were the triblock copolymers PDMS-block-PEO-block-PDMS [P(DMS-EO-DMS)] and PEO-block-PDMS-block-PEO [P(EO-DMS-EO)]. For the former additive the number of monomeric units of the end blocks varied between 4 and 32 and that of the middle block between 23 and 77; these numbers are 70 and 52, respectively, for the latter. In the case of the system PS/PDMS, the diblock copolymer PS-block-PDMS [P(S-DMS)], consisting of 430 S and 68 DMS units, was studied. The effects turned out to be largest for the system PDMS/PEO/P(DMS-EO-DMS); it was therefore studied in greater detail within the temperature range of 70–150°C. Upon addition of increasing amounts of copolymer, σ falls rapidly to ∼ 10% of its initial value and levels off as the critical micelle concentration (< 0.5 wt% in the PEO phase at 100°C) is surpassed. Similarly, at a given concentration of the additive, σ approaches a limiting value as the number of monomeric units in the PDMS block is increased above 15. In contrast to the value of σ of the pure blend, which is practically independent of temperature, that of the ternary system increases markedly with temperature. The results are compared with the predictions of Vilgis and Noolandi." @default.
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- W2034819557 date "1993-01-01" @default.
- W2034819557 modified "2023-10-09" @default.
- W2034819557 title "Effect of block copolymers on the interfacial tension between two ‘immiscible’ homopolymers" @default.
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- W2034819557 doi "https://doi.org/10.1016/0032-3861(93)90862-5" @default.
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