Architecture and solution properties of amphiphilic polymer brushes with peripheral charged ions

Ishizu, Koji; Toyoda, Keiichi; Furukawa, Taiichi; Uchida, Satoshi

doi:10.1016/s0021-9797(03)00077-8

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Details concerning the synthesis of such PEO macromonomers have been given elsewhere. 13 In brief, PEO macromonomers were synthesized by ring-opening polymerization of living PEO anions endcapped with styrene oxide using 2-[2-(N,N-dimethylamino)ethoxy]ethanol potassium alkoxide as an initiator with methacryloyl chloride in toluene. PEO stars were synthesized by free-radical copolymerization of PEO macromonomers with divinylbenzene (DVB) (Tokyo Kasei Ind., Ltd.; 55% m/pisomer ) 2, 45% mixture of ethylstyrene and diethylstyrene) in water at 60 °C for 24 h using 2,2′-azobis[2-(2-imidazolin-2-yl)propane] (VA-061; Wako Pure Chemical Industries, Ltd.) as an initiator in a sealed glass ampule under high vacuum.…”

Section: Methodsmentioning

confidence: 99%

“…Poly(ethylene oxide) (PEO) macromonomers were synthesized by living anionic polymerization technique under high vacuum. Details concerning the synthesis of such PEO macromonomers have been given elsewhere . In brief, PEO macromonomers were synthesized by ring-opening polymerization of living PEO anions end-capped with styrene oxide using 2-[2-( N , N -dimethylamino)ethoxy]ethanol potassium alkoxide as an initiator with methacryloyl chloride in toluene.…”

Section: Methodsmentioning

confidence: 99%

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Lattice Formation of Peripherally Charged Star Polymers in Aqueous Solution

Furukawa

Ishizu

2003

Macromolecules

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Functionalized poly(ethylene oxide) (PEO) stars (arm number f = 37−149) possessing peripheral tertiary amino groups were prepared by organized polymerization using macromonomers. Subsequently, positive charges were introduced into such peripheral tertiary amino groups by quaternization with methyl iodide. The structural ordering of these functionalized and peripherally charged stars was investigated through small-angle X-ray scattering in aqueous solution. PEO stars without charges (f > 72) formed a body-centered-cubic (bcc) structure near the overlap threshold (C*). On the other hand, peripherally charged PEO stars (f > 37) formed a lattice of bcc even below C*. The results indicate that ionization (electric double layer) of stars results in interparticle interactions giving rise to ordering. These interactions were screened by adding inorganic salt (KI).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Lattice Formation of Peripherally Charged Star Polymers in Aqueous Solution

Furukawa

Ishizu

2003

Macromolecules

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“…for the transrational diffusion mode. When there is the internal diffusion mode for large aggregates, Γ– q 2 is characterized by a right upward curve . The Γ– q 2 plot for PMPC 120 ‐PTSM 10 was a straight line that passed through the origin.…”

Section: Resultsmentioning

confidence: 98%

Interpolymer association of amphiphilic diblock copolymers bearing pendant siloxane and phosphorylcholine groups

Kozuka

Kuroda

Ishihara

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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In this study, amphiphilic diblock copolymers (PMPC m -PTSM n ) composed of hydrophilic poly(2-methacryloylo xyethyl phosphorylcholine) (PMPC) and hydrophobic poly(3-(tris (trimethylsiloxy)silyl)propyl methacrylate) (PTSM) were prepared via RAFT-controlled radical polymerization. The subscripts m and n represent the degrees of polymerization of the PMPC and PTSM blocks, respectively. Thus, the m/n ratio represents the hydrophilic/hydrophobic balance of the block copolymer. We prepared PMPC m -PTSM n with m/n ratios of 12, 1.8, and 0.3 and studied their association behaviors in water. PMPC m -PTSM n with m/n ratios of 12 and 1.8 could dissolve in water. However, PMPC m -PTSM n with an m/n ratio of 0.3 did not directly dissolve in water. First, PMPC m -PTSM n with an m/n ratio of 0.3 dissolved in ethanol, whose solution was dialyzed in water to prepare the aqueous solution. The solubilizing state of these polymers in water was examined by light scattering, a fluorescence probe method, and TEM. These polymers took interpolymer aggregation state with various morphologies. The m/n ratios of 12, 1.8, and 0.3 yielded spherical shapes, cylindrical micelles, and vesicle interpolymer aggregate shapes, respectively.Polydimethylsiloxane (PDMS) is flexible and hydrophobic and is characterized by processability and low cytotoxicity. 7-10 Lowmolecular-weight siloxane surfactants are used to manufacture textiles, cosmetics, formulations, agricultural chemicals, paints, and other technologies. Amphiphilic diblock copolymers that contain siloxane groups, which act as a hydrophobic block, have been prepared in the previous studies. For example, diblock copolymers composed of hydrophilic PEO and PDMS 11,12 form spherical micelles, cylinders, and vesicles in water according to the hydrophilic/hydrophobic block chain length ratio, which is due to the hydrophobic interactions between siloxane blocks. Car et al. 13 prepared pH-responsive diblock copolymers composed of PDMS and poly(2-(dimethylamino)ethyl methacrylate) blocks and reported their pH-responsive behavior in an aqueous solution.Poly(2-(methacryloyloxy)ethyl phosphorylcholine) (PMPC) has pendant phosphorylcholine group, which is the same chemical structure as one of the polar parts of the phospholipids that constitutes the cell membrane. 14 PMPC is water-soluble polymer and the surfaces bound with the PMPC shows an excellent resistance for protein adsorption and cell adhesion. Seo et al. 15 reported the preparation of amphiphilic ABA triblock copolymers composed of PMPC as an "A" block and PDMS as a "B" block, as well as random copolymers composed of 2-(methacryloyloxy)ethyl phosphory lcholine (MPC) and 3-(tris(trimethylsiloxy)silyl)propyl methacrylate (TSM) units. ABA triblock copolymers could attach on the PDMS substrates, which are more stable than random copolymers. Since the PMPC unit located on the PDMS substrate surface, Additional supporting information may be found in the online version of this article.

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Preparation of novel macromonomers and study of their polymerization

Deng

Chen

2004

J. Polym. Sci. A Polym. Chem.

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Novel macromonomers of polystyrene and poly(tert‐butyl acrylate) containing a methacryloyl group as a polymerizable unit and two chains of the same length were prepared in two steps: the synthesis of the precursors through the atom transfer radical polymerization of styrene and tert‐butyl acrylate initiated by 1‐hydroxymethyl‐1,1‐di[(2‐bromoisobutyryloxy)methyl] ethane and the esterification of the hydroxyl group in the precursors with methacryloyl chloride. The molecular weight and polydispersity of the macromonomers were controllable because of the living nature of the atom transfer radical polymerization. Gel permeation chromatography, matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry, and hydrolysis confirmed the structure of the novel macromonomers. The homopolymerization and copolymerization of the macromonomers were investigated to prepare branched copolymers in which two chains were grafted from every repeating unit. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 3887–3896, 2004

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Architecture and solution properties of amphiphilic polymer brushes with peripheral charged ions

Cited by 6 publications

References 23 publications

Lattice Formation of Peripherally Charged Star Polymers in Aqueous Solution

Lattice Formation of Peripherally Charged Star Polymers in Aqueous Solution

Interpolymer association of amphiphilic diblock copolymers bearing pendant siloxane and phosphorylcholine groups

Preparation of novel macromonomers and study of their polymerization

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