Reversible mechanochemical systems based on stimuli-responsive polymers. I. Fundamental aspects

• Published in: Polymer-plastics technology and engineering Vol. 41; no. 3; pp. 503 - 521
• Main Authors: Vasiliu-Oprea, Cleopatra, Dan, Florin, Cobzaru, Cecilia, Marcu, Ioan
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 24.06.2002; Taylor & Francis
• Subjects: "Intelligent" polymer gel; Applied sciences; Artificial muscle; Chemomechanical system; Exact sciences and technology; Hydrogel; Organic polymers; Physicochemistry of polymers; Polymer gel; Properties and characterization; Solution and gel properties; Dilatation contraction; Colloidal gel; Relaxation; Swelling; Physical gel; Reversibility; Review; Hydrogel; Kinetic parameter; Diffusion; Phase transitions
• ISSN: 0360-2559; 1525-6111
• DOI: 10.1081/PPT-120004365

Polymer gels can be used to prepare mechanical systems that convert chemical free energy into mechanical work. These gels have characteristics that cause shape changes or generate tensile stress that can lead to mobility. The polymer gel network can be produced by several physical and chemical methods. The principle of reversible contraction and dilatation is based on different mechanisms that depend on the type of stimuli applied. The kinetics of gel swelling has been studied and understood as a combination of two consecutive processes: the collective diffusion and the relaxation process. The response time of gel depends on the thermodynamic quality of the solvent. Gels based on "intelligent" polymers have many interesting applications. Hence, these gels can form the basis of future "soft, wet" technology.