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Responsive Polymers (responsive + polymer)

Distribution by Scientific Domains
Polymers and Materials Science100%

Selected Abstracts

Immobilization: Reversible Immobilization onto PEG-based Emulsion-templated Porous Polymers by Co-assembly of Stimuli Responsive Polymers (Adv. Mater.

ADVANCED MATERIALS, Issue 1 2009
1/2009)
Reversible immobilization onto the surface of highly porous polymers through co-assembly of stimuli-responsive polymers is reported on p. 55 by Neil Cameron and co-workers. Elastin-based side-chain polymers (EBPs) are prepared by RAFT polymerization and attached to the surface of PEG-based emulsion-templated porous polymers. By careful choice of EBP molecular weight and experimental conditions, pH-controlled reversible co-assembly of a complementary EBP from solution is demonstrated. [source]

Reversible Immobilization onto PEG-based Emulsion-templated Porous Polymers by Co-assembly of Stimuli Responsive Polymers,

ADVANCED MATERIALS, Issue 1 2009
Francisco Fernández-Trillo
Reversible immobilization onto the surface of highly porous polymers through the co-assembly of stimuli-responsive polymers is explored (see figure). Elastin-based side-chain polymers (EBPs) are prepared by RAFT and attached to the surface of PEG-based emulsion-templated porous polymers, leading to a responsive surface capable of pH-controlled reversible immobilization. [source]

Control of Molecular Transport Through Stimuli-Responsive Ordered Mesoporous Materials,

ADVANCED MATERIALS, Issue 15 2003
Q. Fu
External and reversible control of the size and surface energy of the pores in mesoporous architectures has been achieved. The method involves modification of mesoporous silica by atom transfer radical polymerization of N -isopropyl acrylamide (the precursor to a stimuli- responsive polymer). The resulting polymer-grafted particles allow the adsorption and transport of molecular species to be dynamically controlled as illustrated in the Figure for the release of rhodamine 6G from the particles at 50,°C. [source]

Humidity-Responsive Starch-Poly(methyl acrylate) Films

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 7 2008
Julious L. Willett
Abstract Blown films prepared from starch-poly(methyl acrylate) graft copolymers plasticized with urea and water display shrinkage at relative humidities greater than 50%. Shrinkage at relative humidities below approximately 75% is strongly correlated with the urea/starch weight ratio, which controls the equilibrium moisture content (MC) in the films. Above 75% relative humidity, film shrinkage is essentially independent of composition. At relative humidities below 90%, films plasticized with urea and water exhibited greater shrinkage than films plasticized with water only. A master curve can be constructed by shifting shrinkage data with respect to a reference relative humidity, indicating that relaxation processes in the starch phase control film shrinkage. This conclusion is confirmed by the fact that shrinkage data for a wide range of compositions and relative humidities fall on a single curve when plotted against MC. Polarized Fourier transform infrared spectroscopy indicated some loss of orientation in the starch phase during shrinkage. These results demonstrate that the hydrophilic nature of starch can be exploited to develop responsive polymers which display controllable shrinkages activated by increases in relative humidities. [source]

Using Metallo-Supramolecular Block Copolymers for the Synthesis of Higher Order Nanostructured Assemblies

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 1 2010
Adam O. Moughton
Abstract Many research groups have explored the properties and solution self-assembly of main chain metallo-supramolecular multiblock copolymers. Until recently, these metal complexes have been used to prepare mainly micelle type structures. However, the self-assembly of such copolymers has been exploited further to create more advanced architectures which utilize the reversible supramolecular linkage of their building blocks as a key component in their synthesis. Furthermore, the incorporation of multiple orthogonal interactions and stimuli responsive polymers into their design, enables more precise external control of their properties. This feature article discusses recent developments and provides an insight into their potential exploitation and development for the creation of novel, smart, and responsive nanostructures. [source]

The mechanism of the oxidative polymerization of aniline and the formation of supramolecular polyaniline structures

POLYMER INTERNATIONAL, Issue 12 2008
Irina Sapurina
Abstract Polyaniline is one of the most important conducting and responsive polymers. A molecular mechanism for the oxidation of aniline is proposed. This mechanism explains the specific features of aniline oligomerization and polymerization in various acidity ranges. The formation of polyaniline precipitates, colloids and thin films is reviewed and discussed on the basis of the chemistry of aniline oxidation. The generation of nanostructures, i.e. granules, nanotubes, nanowires and microspheres, is also considered. Oligomers containing phenazine constitutional units play an important role in self-assembly to form templates. Polyaniline chains then grow from these templates and produce the various individual morphologies. Copyright © 2008 Society of Chemical Industry [source]