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Critical Reviews™ in Biomedical Engineering
SJR: 0.26 SNIP: 0.375 CiteScore™: 1.4

ISSN Imprimir: 0278-940X
ISSN On-line: 1943-619X

Volumes:
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Critical Reviews™ in Biomedical Engineering

DOI: 10.1615/CritRevBiomedEng.v38.i6.10
pages 487-509

Responding to Change: Thermo- and Photoresponsive Polymers as Unique Biomaterials

Laura A. Wells
Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada
Frances Lasowski
School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
Scott D. Fitzpatrick
School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
Heather Sheardown
Department of Chemical Engineering and School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada

RESUMO

Responsive polymer systems that react to thermal and light stimuli have been a focus in the biomaterials literature because they have the potential to be less invasive than currently available materials and may perform well in the in vivo environment. Natural and synthetic polymer systems created to exhibit a temperature-sensitive phase transition lead to in situ forming hydrogels that can be degradable or non-degradable. These systems typically yield physical gels whose properties can be manipulated to accommodate specific applications while requiring no additional solvents or cross-linkers. Photo-responsive isomerization, dimerization, degradation, and triggered processes that are reversible and irreversible may be used to create unique gel, micelle, liposome, and surface-modified polymer systems. Unique wavelengths induce photo-chemical reactions of polymer-bound chromophores to alter the bulk properties of polymer systems. The properties of both thermo- and photo-responsive polymer systems may be taken advantage of to control drug delivery, protein binding, and tissue scaffold architectures. Systems that respond to both thermo- and photo-stimuli will also be discussed because their multi-responsive properties hold the potential to create unique biomaterials.


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