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• W2122394705 abstract "Abstract With the aim of creating highly branched amphiphilic block copolymers, the primary amine end groups of the poly(propylene imine) dendrimers DAB‐ dendr ‐(NH 2 ) 8 and DAB‐ dendr ‐(NH 2 ) 64 were converted to 2‐bromoisobutyramide groups. Poly (styrene‐ b ‐ tert ‐butyl methacrylate) (PS‐ b ‐PtBMA) was synthesized by ATRP from the eight end group initiator, and poly(styrene‐ b ‐ tert ‐butyl acrylate) (PS‐ b ‐PtBA) was synthesized from the 64 end group initiator. The tert ‐butyl groups were removed to produce poly(styrene‐ b ‐methacrylic acid) (PS‐ b ‐PMAA) and poly(styrene‐ b ‐acrylic acid) (PS‐ b ‐PAA). Comparison of size exclusion chromatography (SEC) absolute molecular weight analyses of the polystyrenes with calculated molecular weights showed that the eight end group initiator produced a polystyrene with about eight branches, and that the 64 end group initiator produced polystyrene with many fewer than 64 branches. The PS‐ b ‐PtBA materials also have many fewer than 64 branches. The PS‐ b ‐PAA samples dissolved molecularly in DMF but formed aggregates in water even at pH 10. AFM images of the PS‐ b ‐PtBAs spin coated from THF and DMF onto mica showed aggregates. AFM images of the PS‐ b ‐PAAs spin coated from various mixtures of DMF and water at pH 10 showed flat disks and worm‐like images similar to those observed with linear PS‐ b ‐PAAs. Use of a PS‐ b ‐PAA and a PS‐ b ‐PMAA as templates for emulsion polymerization of styrene produced latexes 100–200 nm in diameter. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4623–4634, 2007" @default.
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• W2122394705 date "2007-09-07" @default.
• W2122394705 modified "2023-10-15" @default.
• W2122394705 title "Branched poly(styrene-<i>b-tert</i>-butyl acrylate) and poly(styrene-<i>b</i>-acrylic acid) by ATRP from a dendritic poly(propylene imine)(NH₂)₆₄core" @default.
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• W2122394705 doi "https://doi.org/10.1002/pola.22200" @default.
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