Micelle Formation in Mixtures of Styrene−Isoprene Diblock Copolymer and Poly(vinyl methyl ether)

Ahn, Jong Hyun; Sohn, Byeong‐Hyeok; Zin, Wang‐Cheol; Noh, Si Tae

doi:10.1021/ma001642+

Cited by 11 publications

(18 citation statements)

References 32 publications

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“…The increasing number of industrial applications for these systems attracted a large interest in both applied science and basic research. [1][2][3][4][5][6][7][8] For instance, DOI: 10.1039/b403157a…”

Section: Introductionmentioning

confidence: 99%

“…Copolymers consisting of polystyrene (PS) and polyisoprene (PI) blocks, as well as the corresponding selfassembled micelles are well documented in the literature. 2,[23][24][25][26] Micelles made of highly asymmetric PS-PI copolymer chains are usually spherical. 2 The size and shape of the individual micelles do not change when the concentration of the copolymer within the micellar disordered regime increases.…”

Section: Introductionmentioning

confidence: 99%

“…2,[23][24][25][26] Micelles made of highly asymmetric PS-PI copolymer chains are usually spherical. 2 The size and shape of the individual micelles do not change when the concentration of the copolymer within the micellar disordered regime increases. The core can be very compact and, depending on the solvent quality (or the insolubility of the inner block), these micelles can be 'frozen', and not exchange any unimer, 10 or mobile, 30 thus implying that the PS core is swollen.…”

Section: Introductionmentioning

confidence: 99%

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Vesicles made of PS-PI cyclic diblock copolymers: In situ freeze-drying cryo-TEM and dynamic light scattering experiments

et al. 2005

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We have studied the morphology of self-assembled micelles made of linear and cyclic poly(styrene-b-isoprene) PS-b-PI block copolymers dispersed in selective solvents of the PI block (n-heptane, n-decane). Up to a copolymer concentration of 5 mg mL(-1), the micelles made from linear block copolymer chains adopt a spherical shape. Those arising from cyclic copolymer chains having exactly the same molar mass and volume fraction self-assemble into (i) planar sunflower-shaped particles at low concentration (c < 0.1 mg mL(-1)), (ii) giant wormlike micelles at intermediate concentration (0.1 mg mL(-1) < c < 2 mg mL(-1)) and (iii) vesicles at higher concentration (2 mg mL(-1) < c < 5 mg mL(-1)). Those results were obtained using dynamic light scattering and in situ freeze-drying cryo-transmission electron microscopy. In this contribution, we discuss the effects of concentration and temperature on the morphology of the self-assembled particles made from both linear and cyclic PS-PI copolymers, and highlight the surprising vesicle formation in cyclic block copolymer solutions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vesicles made of PS-PI cyclic diblock copolymers: In situ freeze-drying cryo-TEM and dynamic light scattering experiments

et al. 2005

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“…Also, the micelle sizes of the EC16 increased with increasing of the concentration of HA. In the case of PCL‐PEG‐PCL/HA blend through attractive interactions between HA and PEG block in the corona region, HA can be solubilized or aggregated into PEG block by the negative mixing enthalpy and swelling the corona region, causing a change in micelle morphology 29. The attractive interactions between HA and PEG block thus induce significantly the enthalpic driving force responsible for the increase of the micelle sizes.…”

Section: Resultsmentioning

confidence: 99%

Thermogelling behaviors of poly(caprolactone‐b‐ethylene glycol‐b‐caprolactone) triblock copolymer in the presence of hyaluronic acid

Kim¹,

Yoo²,

Kim³

et al. 2008

J. Polym. Sci. A Polym. Chem.

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In this article, we studied the effect of hyaluronic acid (HA) on thermogelation of poly(caprolactone-b-ethylene glycol-b-caprolactone) (PCL-PEG-PCL) aqueous solution designed as an injectable system for prevention of postsurgical tissue adhesion. The PCL-PEG-PCL triblock copolymers were simply synthesized by ring-opening polymerization of e-caprolactone (CL) in the presence of PEG as a polymeric initiator. The synthesized copolymers were confirmed by proton nuclear magnetic resonance ( 1 H-NMR) spectroscopy. Possible interactions between HA and PCL-PEG-PCL triblock copolymers in the blend were evaluated by Fourier-transform infrared spectroscopy (FTIR). The effect of HA on the micellization of PCL-PEG-PCL aqueous solution was investigated by dye solubilization method and electrophoretic lighting scattering (ELS) spectrophotometer. Also, the thermogelling behaviors of the PCL-PEG-PCL triblock copolymers in the presence of HA and their mechanism were investigated by test tube inverting method, 13 C-NMR, 1 H-NMR, Advanced Rheometic Expansion System (ARES), and differential scanning calorimetry (DSC). The PCL-PEG-PCL/HA blend aqueous solutions undergo the sol-gel-sol transition in response to an increase in temperature (10-60 8C) and the gelation of the PCL-PEG-PCL was rather accelerated by HA. Presumably, this accelerated gelation seems to arise from the attractive interactions between them and the effect of chain confinement in the micelle corona region. V V C 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: [3629][3630][3631][3632][3633][3634][3635][3636][3637] 2008

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“…Experimentally, this situation has been investigated by different groups. [17][18][19][20][21][22] In several studies polystyrene-based block copolymers were combined with poly(2,6-dimethyl-1,4-diphenyl oxide) (PPO). Paul and co-workers 19,20 used styrene-butadiene-styrene triblock copolymers, whereas Hashimoto and co-workers 21 used styreneisoprene diblock copolymers.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Homopolymer in Lamellar Self-Assembled Diblock Copolymer/Homopolymer Blends Involving Specific Interactions

2007

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The strongly segregated lamellar state of blends of a diblock copolymer with a "long" homopolymer that interacts favorably with one of the blocks of the copolymer is analyzed in detail. The main observations concern the parabolic homopolymer distribution profile, the presence of "dead" zones near the block copolymer interface where no homopolymer is present, and the maximal amount of homopolymer that can be dissolved. Essential parameters are the interfacial tension, the length, and composition of the block copolymer and the Flory-Huggins parameter < 0 representing the favorable interaction between the homopolymer and one of the blocks of the copolymer. Applications are presented for blends consisting of polystyrene-block-poly(4-vinylpyridine) diblock copolymers and poly(2,6-dimethyl-1,4-diphenyl oxide) homopolymers. If the favorable interaction is too weak, no homopolymer will dissolve at all due to the unfavorable conformational effects accompanying an inhomogeneous homopolymer distribution.

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Micelle Formation in Mixtures of Styrene−Isoprene Diblock Copolymer and Poly(vinyl methyl ether)

Cited by 11 publications

References 32 publications

Vesicles made of PS-PI cyclic diblock copolymers: In situ freeze-drying cryo-TEM and dynamic light scattering experiments

Vesicles made of PS-PI cyclic diblock copolymers: In situ freeze-drying cryo-TEM and dynamic light scattering experiments

Thermogelling behaviors of poly(caprolactone‐b‐ethylene glycol‐b‐caprolactone) triblock copolymer in the presence of hyaluronic acid

Distribution of Homopolymer in Lamellar Self-Assembled Diblock Copolymer/Homopolymer Blends Involving Specific Interactions

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