Abstract
We have investigated a new type of A−B/C blend, formed between poly(methyl methacrylate-b-vinylpyrrolidone) and poly(vinylphenol) (PMMA-b-PVP/PVPh), that displays unusual phase behavior. In this blend, the PMMA (A) and PVP (B) blocks within the PMMA-b-PVP (A−B) copolymer are miscible; although PVPh (C) experiences attractive interactions (ξ ≤ 0) through hydrogen bonding, with both the PVP and PMMA blocks, its interaction with the former block is significantly stronger than that with the latter (ξBC ≫ ξAC). We investigated the miscibility and phase behavior of this novel A−B/C blend through the use of FTIR spectroscopy, DSC, 13C CP/MAS solid-state NMR spectroscopy, and TEM. The proton spin−lattice relaxation time in the rotating frame (T1ρH), which we determined using 13C NMR spectroscopy, indicates that phase separation occurs for blends containing ca. 20−60 wt % PVPh. TEM images indicated clearly that the morphology of phase separation consists of a matrix of homogeneous mixed PVP/PVPh and micellar domai...
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