Aggregation Behavior of Short-Chain PDMS-<i>b</i>-PEO Diblock Copolymers in Aqueous Solutions

Kickelbick, Guido; Bauer, Josef; Huesing, Nicola; Andersson, Martin; Holmberg, Krister

doi:10.1021/la035063k

Cited by 54 publications

(56 citation statements)

References 14 publications

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“…The self-arrangement of PDMS-g-POEM comb copolymer into uniform spherical micelles in a polar solvent such as ethanol was proved by the EF-TEM image shown in [26][27][28][29] Micelle morphology is largely dependent on experimental parameters such as the molecular weight of the polymers, relative chain length ratio of each block, type of medium, and concentration. The shape and size of PDMS-g-POEM comb copolymer with a molecular weight of 14,000 gmol -1 in ethanol (1 wt%) are comparable to those reported by Wang et al 29 ; these authors reported that a POEGMA 11.6 -PDMS 11 - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 14 POEGMA 11.6 triblock copolymer with a molecular weight of 9400 gmol -1 could self-assemble into spherical single micelles with a diameter of approximately 100 nm in aqueous solution (0.5 mg mL -1 ).…”

Section: Characterization Of Pdms-g-poem Comb Copolymermentioning

confidence: 99%

Well-Organized Meso-Macroporous TiO₂/SiO₂Film Derived from Amphiphilic Rubbery Comb Copolymer

Jeon

Lee

Patel

et al. 2015

ACS Appl. Mater. Interfaces

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We report the facile synthesis of well-organized meso-macroporous TiO 2 /SiO 2 thin film with high porosity and good interconnectivity from a binary mixture, i.e. titania precursor and polymer template. Our process is based on self-assembly of the amphiphilic rubbery comb copolymer, poly(dimethylsiloxane)-g-poly(oxyethylene methacrylate) (PDMS-g-POEM), with titanium tetraisopropoxide (TTIP). SiO 2 is self-provided by thermal oxidation of PDMS chains during calcination under air. The selective, preferential interaction between TTIP and the hydrophilic POEM chains was responsible for the formation of well-organized TiO 2 /SiO 2 films, as supported by transmission electron microscopy, scanning electron microscopy, X-ray photospectroscopy, and Xray diffraction analyses. We investigated the effect of precursor content, solvent type and polymer concentration on thin film morphology in detail. Photo-degradation of methyl orange by wellorganized meso-macroporous TiO 2 /SiO 2 film was greater than that of dense TiO 2 film prepared without PDMS-g-POEM as well as SiO 2 -etched TiO 2 film. These results indicate that the wellorganized structure and SiO 2 doping of TiO 2 film play a pivotal role in enhancing its photocatalytic properties.

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Section: Characterization Of Pdms-g-poem Comb Copolymermentioning

confidence: 99%

Well-Organized Meso-Macroporous TiO₂/SiO₂Film Derived from Amphiphilic Rubbery Comb Copolymer

Jeon

Lee

Patel

et al. 2015

ACS Appl. Mater. Interfaces

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“…[26] This feature can be used to determine the CMC of a copolymer solution. Figure 4 presents the relationship between the surface tension of copolymer solutions and concentration.…”

Section: Thermoresponsive Behavior Of Copolymer Solutionmentioning

confidence: 99%

N‐Isopropylacrylamide/2‐Hydroxyethyl Methacrylate Star Diblock Copolymers: Synthesis and Thermoresponsive Behavior

Cao

Liu

et al. 2006

Macro Chemistry & Physics

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Tri-arm star diblock copolymers, poly(2-hydroxyethyl methacrylate)-block-poly(N-isopropylacrylamide) [P-(HEMA-b-NIPAAm)] with PHEMA and PNIPAAm as separate inner and outer blocks were synthesized via a twostep ATRP at room temperature. The formation, molecular weight and distribution of polymers were examined, and the kinetics of the reaction was monitored. The PDI of PHEMA was shown to be lower, indicating well-controlled polymerization of trifunctional macro-initiator and resultant star copolymers. The thermoresponsive behavior of diblock copolymer aqueous solution were studied by DSC, phase diagrams, temperature-variable 1 H NMR, TEM and DLS. The results revealed that introducing a higher ratio of HEMA into copolymers could facilitate the formation of micelles and the occurrence of phase transition at lower temperatures. TEM images showed that I-(HEMA 40 -NIPAAm 320 ) 3 solutions developed into core-shell micelles with diameters of approximately 100 nm. I-(HEMA 40 -NIPAAm 320 ) 3 was used as a representative example to elucidate the mechanism underlying temperature-induced phase transition of copolymer solution. In this study we proposed a three-stage transition process: (1) separately dispersed micelles state at %17-22 8C; (2) aggregation and fusion of micelles at %22-29 8C; (3) sol-gel transition of PNIPAAm segments at %29-35 8C, and serious syneresis of shell layers.Molecular architecture of Poly(HEMA-b-NIPAAm).

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“…[15][16][17] Previous studies have also reported the utilization of amphiphilic BCPs to prepare crosslinked hydrogels for tissue engineering applications. 18,19 Several approaches have been reported to combine PEG and PDMS; mainly through covalently linking linear PEG with linear PDMS to form a diblock copolymer, [20][21][22] end-capping linear PEG with linear PDMS to form a triblock copolymer, 23,24 and end-capping linear PDMS with linear PEG to form a triblock copolymer. 10,25,26 Other examples include a random-grafted PEG/PDMS copolymer 27 and a commercially available grafted PEG along a PDMS backbone.…”

Section: Introductionmentioning

confidence: 99%

“…28,29 Past studies have mainly focused on the selfassembly of linear-linear PEG/PDMS diblock copolymers where the formation of micelles and vesicles was reported. 20,22,30,31 These self-assembled structures have the potential to be utilized as nanocarriers in drug delivery system. 31 The stability of nanoparticles is a crucial condition for applications such as controlled drug delivery and release.…”

Section: Introductionmentioning

confidence: 99%

Soft nanoparticles assembled from linear poly(ethylene glycol) and linear brush polydimethylsiloxane diblock copolymers

Halim

Reid

Ren

et al. 2014

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

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A series of novel amphiphilic diblock copolymers composed of hydrophilic linear poly(ethylene glycol) (PEG) and linear brush hydrophobic polydimethylsiloxane (PDMS) were synthesized. Three different molecular weights of monomethyl ether PEG were initially functionalized with 2-bromoisobutyryl bromide to afford macroinitiators suitable for atom-transfer radical polymerization. The macroinitiators were characterized by gel permeation chromatography, 1 H and 13 C nuclear magnetic resonance spectroscopic analysis and matrix-assisted laser desorption ionization time-of-flight mass spectroscopy. The three different molecular weight macroinitiators were then chain extended with monomethacryloxypropyl-terminated PDMS and photoactive 2-(methylacyloyloxy)ethyl anthracene-9-carboxylate in different molar ratios to afford a series of photoresponsive amphiphilic diblock copolymers with high conversions. Self-assembly of these linear-linear brush diblock copolymers in N,N-dimethylformamide afforded nanoparticles with hydrodynamic diameters (d H ) ranging from 41 to 268 nm, as determined by dynamic light scattering analysis. Crosslinking and stabilization of the nanoparticles was achieved via [414] photodimerization of the anthracene moieties upon exposure to UV radiation at 365 nm with the reverse reaction studied at a wavelength of 254 nm. Transmission electron microscopy revealed that the self-assembled nanoparticles and their crosslinked derivatives had spherical morphologies.

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Aggregation Behavior of Short-Chain PDMS-b-PEO Diblock Copolymers in Aqueous Solutions

Cited by 54 publications

References 14 publications

Well-Organized Meso-Macroporous TiO₂/SiO₂Film Derived from Amphiphilic Rubbery Comb Copolymer

Well-Organized Meso-Macroporous TiO₂/SiO₂Film Derived from Amphiphilic Rubbery Comb Copolymer

N‐Isopropylacrylamide/2‐Hydroxyethyl Methacrylate Star Diblock Copolymers: Synthesis and Thermoresponsive Behavior

Soft nanoparticles assembled from linear poly(ethylene glycol) and linear brush polydimethylsiloxane diblock copolymers

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Aggregation Behavior of Short-Chain PDMS-b-PEO Diblock Copolymers in Aqueous Solutions

Cited by 54 publications

References 14 publications

Well-Organized Meso-Macroporous TiO2/SiO2Film Derived from Amphiphilic Rubbery Comb Copolymer

Well-Organized Meso-Macroporous TiO2/SiO2Film Derived from Amphiphilic Rubbery Comb Copolymer

N‐Isopropylacrylamide/2‐Hydroxyethyl Methacrylate Star Diblock Copolymers: Synthesis and Thermoresponsive Behavior

Soft nanoparticles assembled from linear poly(ethylene glycol) and linear brush polydimethylsiloxane diblock copolymers

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Product

Resources

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Well-Organized Meso-Macroporous TiO₂/SiO₂Film Derived from Amphiphilic Rubbery Comb Copolymer

Well-Organized Meso-Macroporous TiO₂/SiO₂Film Derived from Amphiphilic Rubbery Comb Copolymer