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Special Issue "Recent Advances in Stimuli-Responsive Materials"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (15 December 2010)

Special Issue Editor

Guest Editor
Prof. Dr. Dirk Kuckling

Organic and Macromolecular Chemistry, Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
Website | E-Mail
Fax: +49 5251 603245
Interests: controlled polymer synthesis; polymer characterization; smart polymers; hydrolgels; actuators and sensors

Special Issue Information

Dear Colleagues,

The ability of responding to different kinds of signals in a non linear way is one of the key features of life. One promising approach to mimic this behavior is the use of stimuli-responsive (synthetic) polymers. Stimuli-responsive polymers are able to undergo significant property changes as a reply to relatively small external or internal variations of the environmental conditions (stimuli). Therefore these polymers are also named ‘stimuli-sensitive’, ‘smart’, ‘intelligent’ or ‘environmentally sensitive’. The response of the material can have miscellaneous forms: a change in shape and dimension of the polymer material, altering its mechanical, optical or electrical properties as well as changes in permeability can be observed. Smart polymers in solution can also show a macroscopic phase separation as response to a stimulus to form different kinds of aggregates. The architecture of smart polymer systems covers not only different polymer geometries but also several orders of magnitude in size: starting with a single macromolecule in solution, proceeding with self-assembled polymer systems (micelles, vesicles) as well as cross-linked systems including capsules and polymer gels. Modification of surfaces with smart polymers results in materials whose surface properties can be changed by external stimuli. Both the ability to respond to various stimuli and the numerous possible architectures are prerequisites for tailor-made polymeric materials for a broad range of applications.

This issue is supposed to give an extended insight into the fast emerging field of stimuli responsive polymer systems including fundamental basics as well as synthesis and applications of smart polymeric materials.

Prof. Dr. Dirk Kuckling
Guest Editor

Keywords

  • stimuli-responsive
  • smart polymers
  • hydrogel
  • phase transition behavior
  • switchable materials

Published Papers (1 paper)

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Research

Open AccessArticle Crosslinked Graft Copolymer of Methacrylic Acid and Gelatin as a Novel Hydrogel with pH-Responsiveness Properties
Materials 2011, 4(3), 543-552; doi:10.3390/ma4030543
Received: 15 January 2011 / Revised: 20 February 2011 / Accepted: 24 February 2011 / Published: 2 March 2011
Cited by 13 | PDF Full-text (379 KB) | HTML Full-text | XML Full-text
Abstract
In this paper, a novel gelatin-based hydrogel was synthesized through crosslinking graft copolymerization of methacrylic acid (MAA) onto gelatin, using ammonium persulfate (APS) as a free radical initiator in the presence of methylenebisacrylamide (MBA) as a crosslinker. A proposed mechanism for hydrogel formation
[...] Read more.
In this paper, a novel gelatin-based hydrogel was synthesized through crosslinking graft copolymerization of methacrylic acid (MAA) onto gelatin, using ammonium persulfate (APS) as a free radical initiator in the presence of methylenebisacrylamide (MBA) as a crosslinker. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR spectroscopy and gravimetric analysis of the products. Moreover, morphology of the samples was examined by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA/DTG). The effect of reaction variables such as concentration of APS and MBA were systematically optimized to achieve a hydrogel with swelling capacity as high as possible. The gelatin-g-PMAA hydrogel exhibited a pH-responsiveness character so that a swelling-deswelling pulsatile behavior was recorded at pHs 2 and 8. This on-off switching behavior makes the hydrogel as a good candidate for controlled delivery of bioactive agents. Full article
(This article belongs to the Special Issue Recent Advances in Stimuli-Responsive Materials)

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