期刊
MACROMOLECULES
卷 47, 期 23, 页码 8420-8428出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma501725h
关键词
-
资金
- Engineering and Physical Sciences Research Council (EPSRC) of the UK
- NSERC Canada
- EPSRC [EP/K03927X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K03927X/1] Funding Source: researchfish
A comparative study of the solution self-assembly behavior of two polystyrene-arm-polyisoprene-arm-polyferrocenylsilane (mu-SIF) miktoarm star terpolymers of similar composition has been conducted: one with a short, atactic, noncrystallizable poly(ferrocenylethylmethylsilane) (PFEMS) block (mu-SIFa) and one with a short, crystallizable poly(ferrocenyldimethylsilane) (PFDMS) block (mu-SIFc). Both solvent composition and the amorphous/crystallizable nature of the polyferrocenylsilane (PFS) block exhibited a profound influence on the morphologies of the micelles obtained. In hexane, the formation of uniform spherical micelles with an amorphous, phase-mixed PS/PFS core was observed for both mu-SIFa and mu-SIFc. The introduction of cyclohexane (a theta-solvent for PS at 34.5 degrees C) to give a 1:1 cyclohexane/hexane (v/v) solvent composition resulted in the formation of distorted spherical micelles with a core composed of phase-separated PS and PFS, for both mu-SIFa and mu-SIFc. Interestingly, the distorted spherical micelles formed from crystallizable mu-SIFc evolved with time into elongated fiber-like structures with a phase-separated PS and PFDMS core, while the noncrystallizable counterpart, mu-SIFa, remained as distorted spheres. It was found that in ethyl acetate, a good solvent for PI and PS, mu-SIFa remained unimeric in solution, whereas mu-SIFc formed cylindrical micelles composed of a crystalline PFDMS core and a phase-separated, patchy, PS and PI corona. Finally, seeded growth of mu-SIFc from short, cylindrical PFDMS-b-PDMS seeds (PDMS = polydimethylsiloxane) was demonstrated, yielding BAB block comicelles where outer segments derived from mu-SIFc blocks bore a strong resemblance to that ultimately formed under conditions of homogeneous nucleation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据