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| - An Energy Tranfer Study of the Interface Thickness in Blends ofPoly(butyl methacrylate) and Poly(2-ethylhexyl methacrylate)
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| - We propose a model to describe energy transfer between donors and acceptors chemicallyattached to the two different components of a polymer blend. The model describes the case of one polymerdispersed as spheres of identical diameter in a continuous matrix of the second polymer. The model takesexplicit account of the segment distribution of the two polymers in the interface region. We used thismodel to characterize the interface between poly(butyl methacrylate) (PBMA) and poly(2-ethylhexylmethacrylate) (PEHMA) domains in a binary blend. The blend was prepared by casting films onto a solidsubstrate from mixed aqueous latex dispersions of the two polymers. The dispersions were prepared byemulsion polymerization under conditions in which both components were formed as spherical particleswith a very narrow size distribution. By using a 14:1 particle ratio of PEHMA to PBMA, we obtainedfilms in which the 120 nm PBMA particles were surrounded by the PEHMA matrix. For the ion-exchangedlatex blend, the interface thickness in the film freshly prepared at room temperature was δ = 21 ± 2 nmand upon annealing broadened to δ = 25 ± 2 nm. Because of the low degrees of polymerization for thesamples, it is difficult to have confidence in the value of the Flory−Huggins parameter χ calculated fromthe experimental value of δ, because the correction for the finite length of the component is larger thanthe term that depends on the interface width. Keeping in mind the limitations of this calculation, weestimate that χ is approximately equal to 0.02−0.03.
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