Tensile properties of two responsive hydrogels

• Published in: Polymer (Guilford) Vol. 45; no. 26; pp. 8837 - 8843
• Main Authors: Hinkley, Jeffrey A., Morgret, Leslie D., Gehrke, Stevin H.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2004; Elsevier
• Subjects: Applied sciences; Artificial muscle; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; Properties and characterization; Responsive gel; Solution and gel properties; Tensile; Artificial muscle; Tensile; Responsive gel; Vinyl derivative copolymer; Swelling; Mechanical properties; Temperature effect; Tensile property; Experimental study; Colloidal gel; Cellulose(hydroxypropyl); Sulfur containing polymer; Methacrylate copolymer; Comparative study
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2004.09.088

Temperature-responsive hydrogels were prepared from N-vinyl caprolactam/ethylene glycol dimethacrylate (PVCL) or from hydroxypropylcellulose/divinyl sulfone (HPC). Both gels undergo reversible volume shrinkage between room temperature and 50 °C, and for both, the tensile stress–strain behavior in the collapsed state above the temperature-induced transition is qualitatively different from that at room temperature. At the higher temperature, PVCL gels become stiffer, more ductile, and more viscoelastic. HPC gels, on the other hand, have lower initial tangent moduli in the high-temperature state. Possible molecular mechanisms are suggested, and implications for the design of temperature-responsive actuators (‘artificial muscles’) from these materials are discussed.