1
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Poly[(vinyl benzyl trimethylammonium chloride)]-based nanoparticulate copolymer structures encapsulating insulin. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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2
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Poly[oligo(ethylene glycol) methacrylate]- b-poly[(vinyl benzyl trimethylammonium chloride)] Based Multifunctional Hybrid Nanostructures Encapsulating Magnetic Nanoparticles and DNA. Polymers (Basel) 2020; 12:polym12061283. [PMID: 32503350 PMCID: PMC7362237 DOI: 10.3390/polym12061283] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 05/30/2020] [Accepted: 06/01/2020] [Indexed: 02/05/2023] Open
Abstract
We report on the preparation of novel and multifunctional hybrid spherical-shaped nanostructures involving a double-hydrophilic block copolymer, namely the neutral cationic poly[oligo(ethylene glycol) methacrylate]-b-poly[(vinyl benzyl trimethylammonium chloride)] (POEGMA-b-PVBTMAC) diblock copolymer, initially complexed with hydrophilic anionic magnetic nanoparticles (MNPs), and subsequently, with short deoxyribonucleic acid (113 bases DNA). The POEGMA-b-PVBTMAC copolymer, the copolymer/MNPs and the copolymer/MNPs/DNA tricomponent hybrid electrostatic complexes were studied by dynamic/electrophoretic light scattering (DLS/ELS) and cryogenic transmission electron microscopy (cryo-TEM) techniques for the determination of their structure and solution properties. The MNPs were complexed efficiently with the oppositely charged diblock chains, leading to well-defined hybrid organic–inorganic spherical-shaped nanostructures. A significant aggregation tendency of the MNPs is noticed in cryo-TEM measurements after the electrostatic complexation of DNA, implying an accumulation of the DNA macromolecules on the surface of the hybrid tricomponent complexes. Magnetophoretic experiments verified that the MNPs maintain their magnetic properties after the complexation initially with the copolymer, and subsequently, within the block polyelectrolyte/MNPs/DNA nanostructures.
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3
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Xia Y, Zhao J. Macromolecular architectures based on organocatalytic ring-opening (co)polymerization of epoxides. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.03.047] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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4
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Papagiannopoulos A, Karayianni M, Pispas S, Radulescu A. Formation of complexes in aqueous solutions of amphiphilic triblock polyelectrolytes of different topologies and an oppositely charged protein. SOFT MATTER 2018; 14:2860-2869. [PMID: 29565433 DOI: 10.1039/c8sm00208h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The complexation of lysozyme with aggregates from two triblock amphiphilic polyelectrolytes of the same blocks but different topologies and block molar masses, namely PS-b-SCPI-b-PEO and SCPI-b-PS-b-PEO, is investigated by scattering and spectroscopy methods. Light scattering reveals that the interaction with lysozyme causes shrinkage of the self-assembled nanoparticles in the case of the hydrophobic-polyelectrolyte-hydrophilic sequence. In the polyelectrolyte-hydrophobic-hydrophilic sequence, the opposite trend is observed. Small angle neutron scattering confirms the existence of micellar and fractal aggregates and the complexation with lysozyme. The pH-dependence of the interactions and the stability of the hybrid protein/polymer nanoparticles upon salt addition are tested. The native conformation of the protein is found to be preserved during complexation. This study reveals that both micellar and fractal aggregates made of amphiphilic triblock polyelectrolytes are capable of loading with oppositely charged proteins in a controllable manner, tuned primarily by the structure of the triblock terpolymer.
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Affiliation(s)
- Aristeidis Papagiannopoulos
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece.
| | - Maria Karayianni
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece.
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece.
| | - Aurel Radulescu
- Jülich Centre for Neutron Science JCNS Forschungszentrum Jülich GmbH, Outstation at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstraße 1, 85747 Garching, Germany
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5
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Oliver RA, Li R, Townsend CA. Monobactam formation in sulfazecin by a nonribosomal peptide synthetase thioesterase. Nat Chem Biol 2018; 14:5-7. [PMID: 29155429 PMCID: PMC5726899 DOI: 10.1038/nchembio.2526] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 10/20/2017] [Indexed: 11/25/2022]
Abstract
The N-sulfonated monocyclic β-lactam ring characteristic of the monobactams confers resistance to zinc metallo-β-lactamases and affords the most effective class to combat carbapenem-resistant enterobacteria (CRE). Here we report unprecedented nonribosomal peptide synthetase activities, wherein an assembled tripeptide is N-sulfonated in trans before direct synthesis of the β-lactam ring in a noncanonical, cysteine-containing thioesterase domain. This means of azetidinone synthesis is distinct from the three others known in nature.
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Affiliation(s)
- Ryan A. Oliver
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Rongfeng Li
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Craig A. Townsend
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA
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6
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Chrysostomou V, Pispas S. Stimuli-responsive amphiphilic PDMAEMA-b
-PLMA copolymers and their cationic and zwitterionic analogs. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28931] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Varvara Chrysostomou
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave; Athens 11635 Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave; Athens 11635 Greece
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7
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8
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Skaltsas T, Goulielmaki M, Pintzas A, Pispas S, Tagmatarchis N. Carbon quantum dots/block copolymer ensembles for metal-ion sensing and bioimaging. J Mater Chem B 2017; 5:5397-5402. [DOI: 10.1039/c7tb01352c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Carbon quantum dots/block copolymer/bovine serum albumin nanoensembles for metal ion sensing and bioimaging.
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Affiliation(s)
- T. Skaltsas
- Theoretical and Physical Chemistry Institute
- National Hellenic Research Foundation
- 11635 Athens
- Greece
| | - M. Goulielmaki
- Institute of Biology
- Medicinal and Chemistry and Biotechnology
- National Hellenic Research Foundation
- 11635 Athens
- Greece
| | - A. Pintzas
- Institute of Biology
- Medicinal and Chemistry and Biotechnology
- National Hellenic Research Foundation
- 11635 Athens
- Greece
| | - S. Pispas
- Theoretical and Physical Chemistry Institute
- National Hellenic Research Foundation
- 11635 Athens
- Greece
| | - N. Tagmatarchis
- Theoretical and Physical Chemistry Institute
- National Hellenic Research Foundation
- 11635 Athens
- Greece
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9
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10
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Zardalidis G, Gatsouli K, Pispas S, Mezger M, Floudas G. Ionic Conductivity, Self-Assembly, and Viscoelasticity in Poly(styrene-b-ethylene oxide) Electrolytes Doped with LiTf. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01596] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- George Zardalidis
- Department
of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece
| | - Katerina Gatsouli
- Theoretical
and Physical Chemistry Institute, National Hellenic Research Foundation, 116 35 Athens, Greece
| | - Stergios Pispas
- Theoretical
and Physical Chemistry Institute, National Hellenic Research Foundation, 116 35 Athens, Greece
| | - Markus Mezger
- Institute of Physics and Max Planck Institute for Polymer
Research, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | - George Floudas
- Department
of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece
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11
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Papagiannopoulos A, Karayianni M, Mountrichas G, Pispas S, Radulescu A. Micellar and fractal aggregates formed by two triblock terpolymers with different arrangements of one charged, one neutral hydrophilic and one hydrophobic block. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.03.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Zardalidis G, Ioannou EF, Gatsouli KD, Pispas S, Kamitsos EI, Floudas G. Ionic Conductivity and Self-Assembly in Poly(isoprene-b-ethylene oxide) Electrolytes Doped with LiTf and EMITf. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00089] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- G. Zardalidis
- Department of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece
| | - E. F. Ioannou
- Theoretical and
Physical Chemistry Institute, National Hellenic Research Foundation, 116
35 Athens, Greece
| | - K. D. Gatsouli
- Theoretical and
Physical Chemistry Institute, National Hellenic Research Foundation, 116
35 Athens, Greece
| | - S. Pispas
- Theoretical and
Physical Chemistry Institute, National Hellenic Research Foundation, 116
35 Athens, Greece
| | - E. I. Kamitsos
- Theoretical and
Physical Chemistry Institute, National Hellenic Research Foundation, 116
35 Athens, Greece
| | - G. Floudas
- Department of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
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13
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Uchman M, Pispas S, Kováčik L, Štěpánek M. Morphologically Tunable Coassembly of Double Hydrophilic Block Polyelectrolyte with Oppositely Charged Fluorosurfactant. Macromolecules 2014. [DOI: 10.1021/ma500622a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Mariusz Uchman
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
| | - Stergios Pispas
- Theoretical & Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece
| | - Lubomír Kováčik
- Institute
of Cellular Biology and Pathology, First Faculty of Medicine, Charles University in Prague, Albertov 4, 128 01 Prague 2, Czech Republic
| | - Miroslav Štěpánek
- Department
of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128
40 Prague 2, Czech Republic
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14
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Pippa N, Mariaki M, Pispas S, Demetzos C. Preparation, development and in vitro release evaluation of amphotericin B-loaded amphiphilic block copolymer vectors. Int J Pharm 2014; 473:80-6. [PMID: 24998505 DOI: 10.1016/j.ijpharm.2014.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Revised: 06/30/2014] [Accepted: 07/01/2014] [Indexed: 01/08/2023]
Abstract
The aim of this work is to design and develop a suitable polymeric formulation incorporating amphotericin B (Ampho B) in order to overcome its water insolubility problem. To this end, we have chosen the poly(isoprene-b-ethylene oxide) amphiphilic block copolymer (IEO) family. We investigate the self assembly behavior and the stability kinetics of IEO copolymer based nanostructures formed in HPLC grade water and in phosphate buffer saline (PBS). The IEO block copolymer samples investigated have different molecular weights and compositions. A gamut of light scattering techniques (static, dynamic and electrophoretic) were used in order to extract information on the size, ζ-potential and morphological characteristics of the structures formed, as a function of the molar ratio of incorporated lipophilic drug Ampho B. The amphiphilic character and the colloidal stability of the particular polymeric drug vectors indicate that these nanostructures can be utilized as effective containers for the particular hydrophobic drug. The incorporation of Ampho B led to alteration of the physicochemical and morphological characteristics of the pure polymeric carriers. It is observed that the in vitro release of Ampho B from the prepared vectors IEO-b:Ampho B was quite slow, while the IEO-a carriers did not release Ampho B.
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Affiliation(s)
- Natassa Pippa
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771 Athens, Greece; Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece
| | - Maria Mariaki
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771 Athens, Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece
| | - Costas Demetzos
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771 Athens, Greece.
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15
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Zardalidis G, Ioannou E, Pispas S, Floudas G. Relating Structure, Viscoelasticity, and Local Mobility to Conductivity in PEO/LiTf Electrolytes. Macromolecules 2013. [DOI: 10.1021/ma400266w] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- George Zardalidis
- Department of Physics, University of Ioannina, P.O. Box 1186, GR-45110 Ioannina,
Greece
| | - Eirini Ioannou
- Theroretical and
Physical Chemistry
Institute, National Hellenic Research Foundation, Athens, Greece
| | - Stergios Pispas
- Theroretical and
Physical Chemistry
Institute, National Hellenic Research Foundation, Athens, Greece
| | - George Floudas
- Department of Physics, University of Ioannina, P.O. Box 1186, GR-45110 Ioannina,
Greece
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16
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Zhao J, Schlaad H, Weidner S, Antonietti M. Synthesis of terpene–poly(ethylene oxide)s by t-BuP4-promoted anionic ring-opening polymerization. Polym Chem 2012. [DOI: 10.1039/c1py00388g] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Boileau S, Illy N. Activation in anionic polymerization: Why phosphazene bases are very exciting promoters. Prog Polym Sci 2011. [DOI: 10.1016/j.progpolymsci.2011.05.005] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Mantzaridis C, Pispas S. Poly[(sodium sulfamate/carboxylate)isoprene-b
-2-vinyl pyridine] block polyampholytes: Synthesis and self-assembly in aqueous media. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24746] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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20
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Amphiphilic block copolymers by a combination of anionic polymerization and selective post-polymerization functionalization. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2010.09.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Stocco A, Tauer K, Pispas S, Sigel R. Dynamics of amphiphilic diblock copolymers at the air-water interface. J Colloid Interface Sci 2010; 355:172-8. [PMID: 21194709 DOI: 10.1016/j.jcis.2010.11.049] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 11/17/2010] [Accepted: 11/17/2010] [Indexed: 11/30/2022]
Abstract
Two polyisoprene-polyethyleneoxide diblock copolymers with different block length ratios adsorbed to the water surface were investigated by multiple angle of incidence ellipsometry, evanescent wave light scattering, and surface tension experiments. In a semidilute interfacial regime, the transition from a two-dimensional to a "mushroom" regime, in which polymer chains form loops and tails in the subphase, was discussed. A diffusion mechanism parallel to the interface was probed by evanescent wave dynamic light scattering. At intermediate concentrations, the interfacial diffusion coefficient D(∥) scales with the surface concentration Γ, as D(∥) ~ Γ(0.77) in agreement with the scaling observed for polymer solutions in a semidilute regime. At relatively high concentrations a decreasing of D(∥) is discussed in terms of increasing friction due to interactions between polyisoprene chains.
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Affiliation(s)
- Antonio Stocco
- Max Planck Institute of Colloids and Interfaces, 14476 Potsdam-Golm, Germany.
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22
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Du X, Tan Y, Wang H, Zhang L, Ren X. Synthesis, characterization and solution properties of a double-hydrophilic multiblock copolymer with sulfonic groups. JOURNAL OF POLYMER RESEARCH 2010. [DOI: 10.1007/s10965-010-9472-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Du X, Tan Y, Wang H, Zhang L, Ren X. Synthesis, Characterization and Aqueous Solution Behavior of a pH-responsive Double Hydrophilic Block Copolymer. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2010. [DOI: 10.1080/10601325.2010.491754] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Zhao J, Zhang G, Pispas S. Thermoresponsive brush copolymers with poly(propylene oxide-ran-ethylene oxide) side chains via metal-free anionic polymerization “grafting from” technique. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.23997] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Wu Z, Liang H, Lu J. Synthesis of Poly(N-isopropylacrylamide)−Poly(ethylene glycol) Miktoarm Star Copolymers via RAFT Polymerization and Aldehyde−Aminooxy Click Reaction and Their Thermoinduced Micellization. Macromolecules 2010. [DOI: 10.1021/ma100800b] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhaomian Wu
- Key Laboratory of Designed Synthesis and Application of Polymer Material, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Hui Liang
- Key Laboratory of Designed Synthesis and Application of Polymer Material, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Jiang Lu
- Key Laboratory of Designed Synthesis and Application of Polymer Material, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
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Papagiannopoulos A, Karayianni M, Mountrichas G, Pispas S, Radulescu A. Self-Assembled Nanoparticles from a Block Polyelectrolyte in Aqueous Media: Structural Characterization by SANS. J Phys Chem B 2010; 114:7482-8. [DOI: 10.1021/jp1009912] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aristeidis Papagiannopoulos
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Centre National de la Recherche Scientifique (CNRS), 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France, and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at FRM II, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Maria Karayianni
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Centre National de la Recherche Scientifique (CNRS), 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France, and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at FRM II, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Grigoris Mountrichas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Centre National de la Recherche Scientifique (CNRS), 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France, and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at FRM II, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Centre National de la Recherche Scientifique (CNRS), 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France, and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at FRM II, Lichtenbergstrasse 1, 85747 Garching, Germany
| | - Aurel Radulescu
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Centre National de la Recherche Scientifique (CNRS), 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France, and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at FRM II, Lichtenbergstrasse 1, 85747 Garching, Germany
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27
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Gao G, Yan Y, Pispas S, Yao P. Sustained and Extended Release with Structural and Activity Recovery of Lysozyme from Complexes with Sodium (Sulfamate Carboxylate) Isoprene/Ethylene Oxide Block Copolymer. Macromol Biosci 2010; 10:139-46. [DOI: 10.1002/mabi.200900186] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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Zhao J, Mountrichas G, Zhang G, Pispas S. Thermoresponsive Core−Shell Brush Copolymers with Poly(propylene oxide)-block-poly(ethylene oxide) Side Chains via a “Grafting from” Technique. Macromolecules 2010. [DOI: 10.1021/ma902590w] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Junpeng Zhao
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, Anhui, China
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Ave., 11635 Athens, Greece
| | - Grigoris Mountrichas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Ave., 11635 Athens, Greece
| | - Guangzhao Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, Anhui, China
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vass. Constantinou Ave., 11635 Athens, Greece
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29
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Kaditi E, Pispas S. β-Lactam functionalized poly(isoprene-b
-ethylene oxide) amphiphilic block copolymers. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23748] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Zhao J, Mountrichas G, Zhang G, Pispas S. Amphiphilic Polystyrene-b-poly(p-hydroxystyrene-g-ethylene oxide) Block−Graft Copolymers via a Combination of Conventional and Metal-Free Anionic Polymerization. Macromolecules 2009. [DOI: 10.1021/ma9016604] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Junpeng Zhao
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui, China
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635 Athens, Greece
| | - Grigoris Mountrichas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635 Athens, Greece
| | - Guangzhao Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui, China
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Ave., 11635 Athens, Greece
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31
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Zhao J, Zhang G, Pispas S. Morphological transitions in aggregates of thermosensitive poly(ethylene oxide)-b
-poly(N
-isopropylacrylamide) block copolymers prepared via RAFT polymerization. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23470] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Zhao J, Pispas S, Zhang G. Effect of Sonication on Polymeric Aggregates Formed by Poly(ethylene oxide)-Based Amphiphilic Block Copolymers. MACROMOL CHEM PHYS 2009. [DOI: 10.1002/macp.200900161] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Meristoudi A, Pispas S. Polymer mediated formation of corona-embedded gold nanoparticles in block polyelectrolyte micelles. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.04.045] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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34
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Cheng C, Schlüter AD, Zhang A. Thermally Reversible Self-Assembly of Double-Hydrophilic Diblock Copolymers from Poly(N-isopropylacrylamide) and Dendronized Polymethacrylates. Isr J Chem 2009. [DOI: 10.1560/ijc.49.1.49] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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35
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Stocco A, Tauer K, Pispas S, Sigel R. Dynamics at the air-water interface revealed by evanescent wave light scattering. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2009; 29:95-105. [PMID: 19430825 DOI: 10.1140/epje/i2009-10455-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 12/23/2008] [Accepted: 03/25/2009] [Indexed: 05/27/2023]
Abstract
A new tool to study surface phenomena by evanescent wave light scattering is employed for an investigation of an aqueous surface through the water phase. When the angle of incidence passes the critical angle of total internal reflection, a high and narrow scattering peak is observed. It is discussed as an enhancement of scattering at critical angle illumination. Peak width and height are affected by the interfacial profile and the focusing of the beam. In addition, the propagation of capillary waves was studied at the surface of pure water and in the presence of latex particles and amphiphilic diblock copolymers. The range of the scattering vectors where propagating surface waves were detected is by far wider than standard surface quasi-elastic light scattering (SQELS) and comparable with those of X-ray photon correlation spectroscopy (XPCS).
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Affiliation(s)
- A Stocco
- Max Planck Institute of Colloids and Interfaces, 14476, Golm, Germany.
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36
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Liu H, Li C, Liu H, Liu S. pH-responsive supramolecular self-assembly of well-defined zwitterionic ABC miktoarm star terpolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4724-4734. [PMID: 19239225 DOI: 10.1021/la803813r] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report the first example of the synthesis and pH-responsive supramolecular self-assembly of double hydrophilic ABC miktoarm star terpolymers. Well-defined ABC miktoarm star terpolymers consisting of poly(ethylene glycol), poly(tert-butyl methacrylate), and poly(2-(diethylamino)ethyl methacrylate) arms [PEG(-b-PtBMA)-b-PDEA] were synthesized via the combination of consecutive click reactions and atom transfer radical polymerization (ATRP), starting from a trifunctional core molecule, 1-azido-3-chloro-2-propanol (ACP). The click reaction of monoalkynyl-terminated PEG with an excess of ACP afforded difunctional PEG bearing a chlorine and a secondary hydroxyl moiety at the chain end, PEG113(-Cl)-OH (1). After azidation with NaN3, PEG-based macroinitiator PEG113(-N3)-Br (3) was prepared by the esterification of PEG113(-N3)-OH (2) with 2-bromoisobutyryl bromide and then employed in the ATRP of tert-butyl methacrylate (tBMA). The obtained PEG(-N3)-b-PtBMA copolymers (4) possessed an azido moiety at the diblock junction point. The preparation of PEG(-b-PtBMA)-b-PDEA miktoarm star terpolymers was then achieved via the click reaction of 4 with an excess of monoalkynyl-terminated PDEA. The obtained miktoarm star terpolymers were successfully converted into PEG(-b-PMAA)-b-PDEA, where PMAA is poly(methacrylic acid). In aqueous solution, PEG(-b-PMAA)-b-PDEA zwitterionic ABC miktoarm star terpolymers can self-assemble into three types of micellar aggregates by simply adjusting solution pH at room temperature. Above pH 8, PDEA-core micelles stabilized by PEG/ionized PMAA hybrid coronas were formed due to the insolubility of PDEA block. In the range of pH 5-7, micelles possessing polyion complex cores formed as a result of charge compensation between partially ionized PMAA and partially protonated PDEA sequences. At pH<4, hydrogen bonding interactions between fully protonated PMAA and PEG led to the formation of another type of micellar aggregates possessing hydrogen-bonded complex cores stabilized by protonated PDEA coronas. The fully reversible pH-responsive formation of three types of aggregates were characterized by 1H NMR, dynamic and static laser light scattering (LLS), and transmission electron microscopy (TEM).
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Affiliation(s)
- Hao Liu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
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37
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Jiang X, Zhang G, Narain R, Liu S. Fabrication of two types of shell-cross-linked micelles with "inverted" structures in aqueous solution from schizophrenic water-soluble ABC triblock copolymer via click chemistry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2046-2054. [PMID: 19140708 DOI: 10.1021/la803616d] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A well-defined ABC triblock copolymer, poly(2-(2-methoxyethoxy)ethyl methacrylate)-b-poly(2-(dimethylamino)ethyl methacrylate)-b-poly(2-(diethylamino)ethyl methacrylate) (PMEO2MA-b-PDMA-b-PDEA), was synthesized via sequential atom transfer radical polymerization using ethyl 2-bromoisobutyrate as the initiator. Reacting the triblock precursor with propargyl bromide in anhydrous tetrahydrofuran yielded PMEO2MA-b-P(DMA-co-QDMA)-b-PDEA triblock copolymer with "clickable" moieties, where QDMA was quaternized DMA residues. PMEO2MA-b-P(DMA-co-QDMA)-b-PDEA triblock copolymer exhibited "schizophrenic" micellization behavior in aqueous solution, forming three-layer onion-like PMEO2MA-core and PDEA-core micelles upon proper adjustment of the solution pH and temperature. For temperature-induced formation of PMEO2MA-core micelles at acidic pH, the critical micellization temperature can be tuned by incorporating oligo(ethylene glycol) methyl ether methacrylate (OEGMA; the mean degree of polymerization was 8-9) residues into the PMEO2MA block, shifting from 38 to 43 degrees C as the OEGMA contents varied in the range of 0-10 mol %. In both types of micelles, the inner shell layer consisted of the middle P(DMA-co-QDMA) segment. Subsequently, cross-linking with tetra(ethylene glycol) diazide via click chemistry in the presence of copper catalysts led to the facile preparation of two types of shell-cross-linked (SCL) micelles with "inverted" structures in purely aqueous solution. The cores and coronas of SCL micelles exhibited multiresponsive swelling/shrinking and collapse/aggregation behavior, respectively. To the best of our knowledge, this represents the first report of the fabrication of two types of SCL micelles with inverted structures from a single schizophrenic water-soluble triblock copolymer in purely aqueous solution.
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Affiliation(s)
- Xiaoze Jiang
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
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38
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Uchman M, Procházka K, Stepánek M, Mountrichas G, Pispas S, Spírková M, Walther A. pH-dependent self-assembly of polystyrene-block-poly((sulfamate-carboxylate)isoprene) copolymer in aqueous media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:12017-12025. [PMID: 18816020 DOI: 10.1021/la8025842] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The amphiphilic polystyrene- block-poly((sulfamate-carboxylate)isoprene) (PS-PISC) diblock copolymer was synthesized from the precursor diblock copolymer polystyrene- block-isoprene by reaction with chlorosulfonyl isocyanate. The structure and behavior of self-assembled PS-PISC nanoparticles was studied in alkaline and acidic aqueous solutions by a combination of static and dynamic light scattering, analytical ultracentrifugation, atomic force and cryogenic transmission electron microscopies, NMR spectroscopy, potentiometric titration, and fluorometry using pyrene as a polarity-sensitive fluorescent probe. It was found that PS-PISC exists in aqueous solutions in the form of micellar aggregates. The aggregation tendency increases with decreasing effective charge density in the shell, that is, with decreasing pH of the solution, and aggregates found in alkaline aqueous media have much smaller molar masses than those formed in acidic media. The latter are dense, collapsed structures with immobile PISC domains in which most of the COOH and NH 2 (+)SO 3 (-) groups are buried inside of the nanoparticles. The swelling of PISC domains and disentanglement of PISC chains after addition of a base are slow processes occurring on the time scale of days.
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Affiliation(s)
- Mariusz Uchman
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic
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39
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Cai C, Zhang L, Lin J, Wang L. Self-Assembly Behavior of pH- and Thermosensitive Amphiphilic Triblock Copolymers in Solution: Experimental Studies and Self-Consistent Field Theory Simulations. J Phys Chem B 2008; 112:12666-73. [DOI: 10.1021/jp805072t] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chunhua Cai
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Liangshun Zhang
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Jiaping Lin
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Liquan Wang
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China
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40
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Peng Z, Li G, Liu X, Tong Z. Synthesis, pH- and temperature-induced micellization and gelation of doubly hydrophilic triblock copolymer of poly(N,N-dimethylamino-2-ethylmethacrylate)-b-poly(ethylene glycol)-b-poly(N,N-dimethylamino-2-ethylmethacrylate) in aqueous solutions. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22904] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Ranganathan K, Deng R, Kainthan RK, Wu C, Brooks DE, Kizhakkedathu JN. Synthesis of Thermoresponsive Mixed Arm Star Polymers by Combination of RAFT and ATRP from a Multifunctional Core and Its Self-Assembly in Water. Macromolecules 2008. [DOI: 10.1021/ma800094d] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krishnan Ranganathan
- Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, The Chinese University of Hong Kong, Hong Kong; and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Rui Deng
- Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, The Chinese University of Hong Kong, Hong Kong; and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Rajesh K. Kainthan
- Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, The Chinese University of Hong Kong, Hong Kong; and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Chi Wu
- Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, The Chinese University of Hong Kong, Hong Kong; and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Donald E. Brooks
- Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, The Chinese University of Hong Kong, Hong Kong; and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
| | - Jayachandran N. Kizhakkedathu
- Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada; Department of Chemistry, The Chinese University of Hong Kong, Hong Kong; and Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
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42
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Masci G, Diociaiuti M, Crescenzi V. ATRP synthesis and association properties of thermoresponsive anionic block copolymers. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22816] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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43
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Zhang Y, Wu T, Liu S. Micellization Kinetics of a Novel Multi-Responsive Double Hydrophilic Diblock Copolymer Studied by Stopped-Flow pH and Temperature Jump. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200700293] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Mountrichas G, Pispas S, Tagmatarchis N. Aqueous carbon-nanotube-amphiphilic-block-copolymer nanoensembles: towards realization of charge-transfer processes with semiconductor quantum dots. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:404-7. [PMID: 17245781 DOI: 10.1002/smll.200600476] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- Grigoris Mountrichas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece
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45
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Xu Y, Shi L, Ma R, Zhang W, An Y, Zhu X. Synthesis and micellization of thermo- and pH-responsive block copolymer of poly(N-isopropylacrylamide)-block-poly(4-vinylpyridine). POLYMER 2007. [DOI: 10.1016/j.polymer.2007.01.022] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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46
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Pispas S. Complexes of lysozyme with sodium (sulfamate-carboxylate)isoprene/ethylene oxide double hydrophilic block copolymers. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.21871] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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47
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Lowe AB, Torres M, Wang R. A doubly responsive AB diblock copolymer: RAFT synthesis and aqueous solution properties of poly (N-isopropylacrylamide-block-4-vinylbenzoic acid). ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22338] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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Peng Z, Wang D, Liu X, Tong Z. RAFT synthesis of a water-soluble triblock copolymer of poly(styrenesulfonate)-b-poly(ethylene glycol)-b-poly(styrenesulfonate) using a macromolecular chain transfer agent in aqueous solution. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22119] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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49
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Mountrichas G, Pispas S. Novel double hydrophilic block copolymers based on poly(p-hydroxystyrene) derivatives and poly(ethylene oxide). ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22329] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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50
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Bo Q, Zhao Y. Double-hydrophilic block copolymer for encapsulation and two-way pH change-induced release of metalloporphyrins. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21287] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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