Honeycomb-Structured Porous Films from Polypyrrole-Containing Block Copolymers Prepared via RAFT Polymerization as a Scaffold for Cell Growth

2006 ◽  
Vol 7 (4) ◽  
pp. 1072-1082 ◽  
Author(s):  
Danelle Beattie ◽  
Kok Hou Wong ◽  
Charles Williams ◽  
Laura A. Poole-Warren ◽  
Thomas P. Davis ◽  
...  
Keyword(s):  
Cell Growth ◽  
Block Copolymers ◽  
Raft Polymerization ◽  
Porous Films

Honeycomb structured porous films from amphiphilic block copolymers prepared via RAFT polymerization

Polymer ◽  
2007 ◽  
Vol 48 (17) ◽  
pp. 4950-4965 ◽  
Author(s):  
Kok Hou Wong ◽  
Thomas P. Davis ◽  
Christopher Barner-Kowollik ◽  
Martina H. Stenzel
Keyword(s):  
Block Copolymers ◽  
Raft Polymerization ◽  
Amphiphilic Block Copolymers ◽  
Porous Films

scholarly journals Gold-Loaded Organic/Inorganic Nanocomposite Honeycomb Membranes

2006 ◽  
Vol 59 (8) ◽  
pp. 539 ◽  
Author(s):  
Kok Hou Wong ◽  
Thomas P. Davis ◽  
Christopher Barner-Kowollik ◽  
Martina H. Stenzel
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Raft Polymerization ◽  
Porous Films ◽  
Breath Figures ◽  
Vinyl Pyridine ◽  
Self Assembled ◽  
Gold Nanocomposites ◽  
Hydrolysis Of ◽  
Porous Array

RAFT polymerization was used to prepare polystyrene – poly(4-vinyl pyridine) block copolymers, PSn-b-P(4VP)m. Well-defined block copolymers were obtained despite some indications of hydrolysis of the RAFT endgroup during synthesis. The block copolymer PS70-b-P(4VP)55 was self-assembled into micellar structures in dichloromethane, leading to nanoparticles with hydrodynamic diameters of 70 nm. The micelles were loaded with HAuCl4 and, upon reduction, micellar gold-containing nanoparticles with hydrodynamic diameters of 240 nm were obtained. These nanoparticles were employed in the preparation of honeycomb-structured porous films by means of the breath figures technique to yield gold nanocomposites with a hexagonal porous array.

PdNPs@thermo-responsive block copolymers composed of PNIPAM and poly(ionic liquid) via RAFT polymerization

2018 ◽  
Vol 76 (6) ◽  
pp. 2819-2834 ◽  
Author(s):  
Soheila Ghasemi ◽  
Zahra Amini Harandi
Keyword(s):  
Ionic Liquid ◽  
Block Copolymers ◽  
Raft Polymerization ◽  
Poly Ionic Liquid

One-step synthesis of poly(2-oxazoline)-based amphiphilic block copolymers using a dual initiator for RAFT polymerization and CROP

Polymer ◽  
2014 ◽  
Vol 55 (23) ◽  
pp. 5986-5990 ◽  
Author(s):  
Young Chang Yu ◽  
Hang Sung Cho ◽  
Woong-Ryeol Yu ◽  
Ji Ho Youk
Keyword(s):  
Block Copolymers ◽  
Raft Polymerization ◽  
Amphiphilic Block Copolymers ◽  
One Step

scholarly journals Enhancing the biocompatibility of siliconepolycarbonate urethane based implant materials

2019 ◽  
Vol 5 (1) ◽  
pp. 453-455 ◽  
Author(s):  
Kiriaki Athanasopulu ◽  
Larysa Kutuzova ◽  
Joana Thiel ◽  
Günter Lorenz ◽  
Ralf Kemkemer
Keyword(s):  
Molecular Weight ◽  
Cell Proliferation ◽  
Hyaluronic Acid ◽  
Cell Growth ◽  
Block Copolymers ◽  
Cytotoxic Potential ◽  
Implant Surface ◽  
Characterization Methods ◽  
Hard Segments

AbstractPolyurethane-bases block copolymers (TPCUs) are block-copolymers with systematically varied soft and hard segments. They have been suggested to serve as material for chondral implants in joint regeneration. Such applications may require the adhesion of chondrocytes to the implant surface, facilitating cell growth while keeping their phenotype. Thus, aims of this work were (i) to modify the surface of soft biostable polyurethane-based model implants (TPCU and TSiPCU) with high-molecular weight hyaluronic acid (HA) using an optimized multistep strategy of immobilization, and (ii) to evaluate bioactivity of the modified TPCUs in vitro. Our results show no cytotoxic potential of the TPCUs. HAbioactive molecules (Mw =700kDa) were immobilized onto the polyurethane surface via polyethylenimine (PEI) spacers, and modifications were confirmed by several characterization methods. Tests with porcine chondrocytes indicated the potential of the TPCU-HA for inducing enhanced cell proliferation.

Solvent Effects on the Synthesis of Polymeric Nanoparticles via Block Copolymer Self-Assembly Using Microporous Membranes

2020 ◽  
Vol 1000 ◽  
pp. 324-330
Author(s):  
Sri Agustina ◽  
Masayoshi Tokuda ◽  
Hideto Minami ◽  
Cyrille Boyer ◽  
Per B. Zetterlund
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Self Assembly ◽  
Polymeric Nanoparticles ◽  
Raft Polymerization ◽  
Membrane Emulsification ◽  
Membrane Pore ◽  
Novel Technique ◽  
Wide Range ◽  
Membrane Pore Size

The self-assembly of block copolymers has attracted attention for many decades because it can yield polymeric nanoobjects with a wide range of morphologies. Membrane emulsification is a fairly novel technique for preparation of various types of emulsions, which relies on the dispersed phase passing through a membrane in order to effect droplet formation. In this study, we have prepared polymeric nanoparticles of different morphologies using self-assembly of asymmetric block copolymers in connection with membrane emulsification. Shirasu Porous Glass (SPG) membranes has been employed as the membrane emulsification equipment, and poly (oligoethylene glycol acrylate)-block-poly (styrene) (POEGA-b-PSt) copolymers prepared via RAFT polymerization. It has been found that a number of different morphologies can be achieved using this novel technique, including spheres, rods, and vesicles. Interestingly, the results have shown that the morphology can be controlled not only by adjusting experimental parameters specific to the membrane emulsification step such as membrane pore size and pressure, but also by changing the nature of organic solvent. As such, this method provides a novel route to these interesting nanoobjects, with interesting prospects in terms of exercising morphology control without altering the nature of the block copolymer itself.

One-pot synthesis of poly(N-vinylcaprolactam)-based biocompatible block copolymers using a dual initiator for ROP and RAFT polymerization

Polymer ◽  
2013 ◽  
Vol 54 (22) ◽  
pp. 6119-6124 ◽  
Author(s):  
Young Chang Yu ◽  
Guoxue Li ◽  
Jinsang Kim ◽  
Ji Ho Youk
Keyword(s):  
Block Copolymers ◽  
Raft Polymerization ◽  
One Pot ◽  
One Pot Synthesis

Triple hydrogen-bonding block copolymers via RAFT polymerization: Synthesis, vesicle formation, and molecule-recognition behavior

2016 ◽  
Vol 54 (11) ◽  
pp. 1633-1638 ◽  
Author(s):  
Shixue Wang ◽  
Maosheng Li ◽  
Hang Zhang ◽  
Xinxiao Yang ◽  
Xiaojie Zhang ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Block Copolymers ◽  
Raft Polymerization ◽  
Vesicle Formation ◽  
Molecule Recognition

scholarly journals Antimicrobial Porous Surfaces Prepared by Breath Figures Approach

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1266 ◽  
Author(s):  
Alexandra Muñoz-Bonilla ◽  
Rocío Cuervo-Rodríguez ◽  
Fátima López-Fabal ◽  
José Gómez-Garcés ◽  
Marta Fernández-García
Keyword(s):  
Block Copolymers ◽  
Side Chain ◽  
Porous Films ◽  
Narrow Pore Size Distribution ◽  
Breath Figures ◽  
Gram Positive Bacteria ◽  
Alkyl Groups ◽  
Porous Surfaces ◽  
Cationic Copolymers ◽  
Ordered Porous

Herein, efficient antimicrobial porous surfaces were prepared by breath figures approach from polymer solutions containing low content of block copolymers with high positive charge density. In brief, those block copolymers, which were used as additives, are composed of a polystyrene segment and a large antimicrobial block bearing flexible side chain with 1,3-thiazolium and 1,2,3-triazolium groups, PS54-b-PTTBM-M44, PS54-b-PTTBM-B44, having different alkyl groups, methyl or butyl, respectively. The antimicrobial block copolymers were blended with commercial polystyrene in very low proportions, from 3 to 9 wt %, and solubilized in THF. From these solutions, ordered porous films functionalized with antimicrobial cationic copolymers were fabricated, and the influence of alkylating agent and the amount of copolymer in the blend was investigated. Narrow pore size distribution was obtained for all the samples with pore diameters between 5 and 11 µm. The size of the pore decreased as the hydrophilicity of the system increased; thus, either as the content of copolymer was augmented in the blend or as the copolymers were quaternized with methyl iodide. The resulting porous polystyrene surfaces functionalized with low content of antimicrobial copolymers exhibited remarkable antibacterial efficiencies against Gram positive bacteria Staphylococcus aureus, and Candida parapsilosis fungi as microbial models.

Synthesis of amphiphilic block copolymers based on poly(dimethylsiloxane) via fragmentation chain transfer (RAFT) polymerization

Polymer ◽  
2004 ◽  
Vol 45 (13) ◽  
pp. 4383-4389 ◽  
Author(s):  
Tommy S.C Pai ◽  
Christopher Barner-Kowollik ◽  
Thomas P Davis ◽  
Martina H Stenzel
Keyword(s):  
Block Copolymers ◽  
Chain Transfer ◽  
Raft Polymerization ◽  
Amphiphilic Block Copolymers
Sign in / Sign up

Export Citation Format

Share Document