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- W1969123485 abstract "Reactive blending of dissimilar polymers involves in situ reactions of functionalized components to form a block or graft copolymer at the interface between phases. The copolymer is believed to play a role of the emulsifier to prevent particle coalescence and to improve interfacial adhesion. A mixture of non-reactive polysulfone (PSU) and small amount of reactive PSU, phthalic anhydride-terminated PSU (PSU–PhAH), was melt-blended with polyamide (PA) at 65/35 (PSU/PA) wt ratio using a miniature mixer. When the molecular weight of PSU–PhAH was high (comparable with non-reactive PSU), PA particles were dispersed in PSU matrix and the particle size was much smaller than non-reactive system, suggesting the typical emulsifying effect caused by the in situ formed block copolymer. On the other hand, when the molecular weight of PSU–PhAH was much smaller than the non-reactive PSU, phase inversion took place; i.e. at early stages of mixing, PA particles were dispersed in PSU matrix; however, at later stages the PSU particles were dispersed in PA matrix. TEM observation showed a micelle formation in PSU particles. The phase inversion mechanism was discussed in terms of the increase in viscosity of PSU phase caused by the pull-out of the in situ formed block copolymers." @default.
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- W1969123485 date "2000-07-01" @default.
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- W1969123485 title "In situ formed copolymers as emulsifier and phase-inversion-aid in reactive polysulfone/polyamide blends" @default.
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- W1969123485 doi "https://doi.org/10.1016/s0032-3861(99)00793-4" @default.
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