4.7 Article

Thermoresponsive hydrogels based on poly(N-isopropylacrylamide)/chondroitin sulfate

Journal

SENSORS AND ACTUATORS B-CHEMICAL
Volume 135, Issue 1, Pages 336-341

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.09.001

Keywords

Chondroitin sulfate; PNIPAm; Hydrogel; Thermosensitive; Swelling

Funding

  1. Ministry of Education, Science and Technology (MEST)/the Korea Science and Engineering Foundation (KOSEF) in Korea

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A fast, thermoresponsive hydrogel composed of poly(N-isopropylacrylamide) (PNIPAm) and chondroitin sulfate (ChS) was synthesized using precipitation polymerization. ChS was introduced to increase the water absorption of the PNIPAm hydrogel. and the precipitation polymerization method was used to induce a porous network morphology to enhance the thermal response of the hydrogel. PNIPAm/ChS hydrogels (15:7.5 wt.%) underwent a very fast deswelling, within a period of approximately 2 min, due to the presence of a large free water content (similar to 90-94%), which was associated with the interconnected filamentous morphology within the hydrogel. The swelling ratio was greatly enhanced by the addition of ChS. The hydrogels exhibited stable thermoactuation behavior, following a volume change of 75% while cycling the temperature between 20 and 45 degrees C. (C) 2008 Elsevier B.V. All rights reserved.

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