Thermally Responsive Swelling Properties of Polyacrylamide/Poly(acrylic acid) Interpenetrating Polymer Network Nanoparticles

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• 作者：Donald E. Owens III ; Yicun Jian ; Justin E. Fang ; Brandon V. Slaughter ; Yi-Hsuan Chen ; Nicholas A. Peppas
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：October 2, 2007
• 年：2007
• 卷：40
• 期：20
• 页码：7306 - 7310
• 全文大小：462K
• 年卷期：v.40,no.20(October 2, 2007)
• ISSN：1520-5835

文摘

Interpenetrating polymer network (IPN), random copolymer, and homopolymer nanoparticles ofacrylamide and acrylic acid were prepared using an inverse emulsion polymerization technique. Differentialscanning calorimetry and Fourier-transform infrared spectroscopy were used to examine the molecular structureof the prepared polymeric nanoparticles. The spherical morphology and size (~250 nm diameter) of thenanoparticles was confirmed using scanning electron microscopy. Dynamic light scattering was used to determinethe monodispersity of the particle size distribution and examine the thermally responsive swelling properties ofthe polymeric nanoparticle structures. Of the particle systems studied, only the IPN nanoparticles exhibited aunique, rapid sigmoidal swelling transition with temperature. These systems also achieved a much larger relativeswelling volume compared to random copolymer and homopolymer particles comprised of acrylamide and acrylicacid. Increased cross-linker density resulted in an overall decrease in the maximum relative swelling volume thatwas obtained.