期刊
MACROMOLECULES
卷 43, 期 18, 页码 7807-7812出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma101529b
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资金
- Word Premier International Research Center-Advanced Institute for Materials Research (WPI-AIMR) in Tohoku University
- Ministry of Education, Science, Sports and Culture [21015017, 21106512, 21241030]
- US National Science Foundation through the MRSEC at the University of Massachusetts Amherst [DMR-0820506, CBET-0931616]
- Office of Basic Energy Science of the US Department of Energy
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0931616] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820506] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [21241030, 21106512, 21015017] Funding Source: KAKEN
Nanoparticles with concentric layered structures were generated from a lamellae-forming poly(styrene-b-isoprene) diblock copolymer using controlled precipitation from a tetrahydrofuran/water mixture. Chloroform, a good solvent for both blocks, was used to swell and anneal the nanoparticles suspended in aqueous media. The three-dimensional morphologies of particles were reconstructed by transmission electron microtomography throughout the process of solvent annealing. A transition from concentric lamellae to PI cylinders in a PS matrix occurred upon annealing, presumably due to a slight selectivity of chloroform for PS. These cylindrical microdomains were further divided into PS-core PI-shell spherical structures in a PS matrix upon extended annealing, a structure that is unique among reported microphase separated morphologies of diblock copolymers.
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