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Nanostructured Polymer Blends
Sérgio Roberto Montoro
Simone de Fátima Medeiros
Gizelda Maria Alves
其他書名
Chapter 10. Nanostructured Hydrogels
出版
Elsevier Inc. Chapters
, 2013-11-28
主題
Technology & Engineering / Aeronautics & Astronautics
Technology & Engineering / Electronics / General
Technology & Engineering / Textiles & Polymers
Technology & Engineering / Automotive
Technology & Engineering / Engineering (General)
Technology & Engineering / Nanotechnology & MEMS
ISBN
0128090871
9780128090879
URL
http://books.google.com.hk/books?id=Whd0DAAAQBAJ&hl=&source=gbs_api
EBook
SAMPLE
註釋
Polymer systems can be developed into a variety of functional forms to meet industrial and scientific applications. In general, they are presented in four common physical forms: (1) linear free chains in solution, (2) covalently or physically cross-linked reversible gels, (3) micro and nanoparticles, and (4) chains adsorbed or in surface-grafted form. Hydrogels are polymeric particles consisting of water-soluble polymer chains, chemically or physically connected using, in general, a cross-linking agent. These materials do not dissolve in water but may swell considerably in aqueous medium, demonstrating an extraordinary ability (>20%) to absorb water into the reticulated structure. Such features make these materials promising tools in the biomedical field, especially as controlled drug release systems. This chapter describes recent progress in the development and applications of polymeric nanostructured hydrogels, mainly in the context of biomedical devices. Additionally, it reports the significant advances in synthesis and characterization strategies of these materials. Special attention is devoted to smart or stimuli-responsive bionanogels, which mimic the property of living systems responding to environmental changes such as pH, temperature, light, pressure, electric field, chemicals, or ionic strength, or a combination of different stimuli. Consequently, these bionanogels offer an efficient solution to various biomedical limitations in the field of drug administration.