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Hydrophilic Block Copolymer (hydrophilic + block_copolymer)

Distribution by Scientific Domains
Polymers and Materials Science100%

Kinds of Hydrophilic Block Copolymer

  • double hydrophilic block copolymer
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    Selected Abstracts

    The Combination of Colloid-Controlled Heterogeneous Nucleation and Polymer-Controlled Crystallization: Facile Synthesis of Separated, Uniform High-Aspect-Ratio Single-Crystalline BaCrO4 Nanofibers

    ADVANCED MATERIALS, Issue 2 2003
    S.-H. Yu
    Uniform, separated BaCrO4 single-crystalline nanofibers with high aspect ratio (>,5000, see Figure) can be fabricated at room temperature in aqueous solution using a double hydrophilic block copolymer as structure-directing agent and introducing colloidal nucleation agents. Such fibers represent a model case for advanced polymer fillers and the exploration of quasi-1D nanostructures with interesting electrical, optical, or catalytic properties. [source]

    Gold nanoparticle-incorporated core and shell crosslinked micelles fabricated from thermoresponsive block copolymer of N -isopropylacrylamide and a novel primary-amine containing monomer

    JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 19 2008
    Yueming Zhou
    Abstract A novel primary amine-containing monomer, 1-(3,-aminopropyl)-4-acrylamido-1,2,3-triazole hydrochloride (APAT), was prepared from N -propargylacrylamide and 3-azidopropylamine hydrochloride via copper-catalyzed Huisgen 1,3-dipolar cycloaddition (click reaction). Poly(N -isopropylacrylamide)- b -poly(1-(3,-aminopropyl)-4-acrylamido-1,2,3-triazole hydrochloride), PNIPAM- b- PAPAT, was then synthesized via consecutive reversible addition-fragmentation chain transfer polymerizations of N -isopropylacrylamide and APAT. In aqueous solution, the obtained thermoresponsive double hydrophilic block copolymer dissolves molecularly at room temperature and self-assembles into micelles with PNIPAM cores and PAPAT shells at elevated temperature. Because of the presence of highly reactive primary amine moieties in PAPAT block, two types of covalently stabilized nanoparticles namely core crosslinked and shell crosslinked micelles with ,inverted' core-shell nanostructures were facilely prepared upon the addition of glutaric dialdehyde at 25 and 50 °C, respectively. In addition, the obtained structure-fixed micelles were incorporated with gold nanoparticles via in situ reduction of preferentially loaded HAuCl4. High resolution transmission electron microscopy revealed that gold nanoparticles can be selectively loaded into the crosslinked cores or shells, depending on the micelle templates employed. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 6518,6531, 2008 [source]

    Well-defined glycopolymer amphiphiles for liquid and supercritical carbon dioxide applications

    JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 21 2001
    Weijun Ye
    Abstract Well-defined D -glucose-containing glycopolymers, poly(3- O -methacryloyl-1,2 : 5,6-di- O -isopropylidene- D -glucofuranose) (PMAIpGlc), and diblock copolymers of PMAIpGlc with poly(1,1-dihydroperfluorooctyl methacrylate) (PFOMA) were synthesized by living anionic polymerization in THF at ,78 °C with 1,1-diphenylhexyllithium in the presence of lithium chloride. The resulting polymers were found to possess predictable molecular weights and very narrow molecular weight distributions (MWD, Mw/Mn , 1.16). Removal of the acetal protective groups from the protected glycopolymer block copolymer was carried out using 90% trifluoroacetic acid at room temperature, yielding a hydrophilic block copolymer with pendant glucose moieties. Both protected (lipophilic/CO2 -philic) and deprotected (hydrophilic/CO2 -philic) fluorocopolymers were proved to be CO2 amphiphiles. Their solubility in CO2 was heavily influenced by the amphiphilic structure, such as the copolymer compositions and the polarities of sugar block. Light-scattering studies showed that, after removal of the protective groups, the deprotected block copolymer formed aggregate structures in liquid CO2 with an average micellar size of 27 nm. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3841,3849, 2001 [source]

    Double hydrophilic block copolymers of sodium(2-sulfamate-3-carboxylate)isoprene and ethylene oxide

    JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 1 2006
    Stergios Pispas
    Abstract Poly(sodium(2-sulfamate-3-carboxylate)isoprene)- b -poly(ethylene oxide) and poly(ethylene oxide)- b -poly(sodium(2-sulfamate-1-carboxylate)isoprene)- b -poly(ethylene oxide) double hydrophilic block copolymers were prepared by selective post polymerization reaction of the polyisoprene block, of poly(isoprene- b -ethylene oxide) diblocks or poly(ethylene oxide- b -isoprene- b -ethylene oxide) triblock precursors, with N -chlorosulfonyl isocyanate. The precursors were synthesized by anionic polymerization high vacuum techniques and had narrow molecular weight distributions and predictable molecular weights and compositions. The resulting double hydrophilic block copolymers were characterized by FTIR and potentiometric titrations in terms of the incorporated functional groups. Their properties in aqueous solutions were studied by viscometry and dynamic light scattering. The latter techniques revealed a complex dilute solution behavior of the novel block copolymers, resulting from the polyelectrolyte character of the functionalized PI block and showing a dependence on solution ionic strength and pH. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 606,613, 2006 [source]

    Multi-Responsive Supramolecular Double Hydrophilic Diblock Copolymer Driven by Host-Guest Inclusion Complexation between , -Cyclodextrin and Adamantyl Moieties

    MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 24 2009
    Hao Liu
    Abstract Well-defined , -CD-terminated poly(N -isopropylacrylamide) (, - CD -PNIPAM) was synthesized via a combination of atom transfer radical polymerization (ATRP) and click chemistry. Moreover, adamantyl-terminated poly(2-(diethylamino)ethyl methacrylate) (Ad -PDEA) was synthesized by ATRP using an adamantane-containing initiator. Host-guest inclusion complexation between ,-CD and adamantyl moieties drives the formation of supramolecular double hydrophilic block copolymers (DHBC) from , -CD-PNIPAM and Ad -PDEA. The obtained supramolecular PNIPAM- b -PDEA diblock copolymer exhibits intriguing multi-responsive and reversible micelle-to-vesicle transition behavior in aqueous solution by dually playing with solution pH and temperatures. [source]