Property modulation of Poly(N-isopropylacrylamide) hydrogels by incorporation of modified silica.(Technical report): An article from: Polymer Engineering and Science
Book Details
Author(s)Myong Jo Ham, Young Ho Kim
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB001OB3GRI
ISBN-13978B001OB3GR2
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on December 1, 2008. The length of the article is 3601 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: Poly(N-isopropylacrylamide) (PNIPA)/silica composite hydrogels were prepared and the effects of the silica incorporation on the swelling and breaking characteristics of the hydrogels were investigated. To improve the dispersive property of silica in the PNIPA matrix via the formation of covalent bonds between the polymer and silica, vinyl groups were introduces in the silica by reacting it with a coupling agent, 3-methacryloxypropyltrimathoxysilane. When unmodified silica was used as filler in the PNIPA-composite hydrogel, the swelling ratio of the composite hydrogel below the critical gel transition temperature (CGTT) increased with increasing silica content. However, when the modified silica was used as the filler, the swelling ratio below CGTT decreased with increasing silica content because of the enhanced distribution and additional crosslinking. Above CGTT, the swelling ratios of the PNIPA/silica hydrogels were similar regardless of the silica modification. The gel breaking stress of the hydrogels increased with increasing silica content, and this enhancement was larger for the modified silica hydrogel. Scanning electron microscopy images silica hydrogel. Scanning electron microscopy images showed that the modified silica particles were distributed more evenly in the PNIPA matrix than the unmodified ones were and that the size of cell-like structure of the hydrogel decreased with increasing modified silica content. POLYM. ENG. SCI., 48:2439-2445, 2008. [C] 2008 Society of Plastics Engineers
Citation Details
Title: Property modulation of Poly(N-isopropylacrylamide) hydrogels by incorporation of modified silica.(Technical report)
Author: Myong Jo Ham
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: December 1, 2008
Publisher: Society of Plastics Engineers, Inc.
Volume: 48 Issue: 12 Page: 2439(7)
Article Type: Technical report
Distributed by Gale, a part of Cengage Learning
From the author: Poly(N-isopropylacrylamide) (PNIPA)/silica composite hydrogels were prepared and the effects of the silica incorporation on the swelling and breaking characteristics of the hydrogels were investigated. To improve the dispersive property of silica in the PNIPA matrix via the formation of covalent bonds between the polymer and silica, vinyl groups were introduces in the silica by reacting it with a coupling agent, 3-methacryloxypropyltrimathoxysilane. When unmodified silica was used as filler in the PNIPA-composite hydrogel, the swelling ratio of the composite hydrogel below the critical gel transition temperature (CGTT) increased with increasing silica content. However, when the modified silica was used as the filler, the swelling ratio below CGTT decreased with increasing silica content because of the enhanced distribution and additional crosslinking. Above CGTT, the swelling ratios of the PNIPA/silica hydrogels were similar regardless of the silica modification. The gel breaking stress of the hydrogels increased with increasing silica content, and this enhancement was larger for the modified silica hydrogel. Scanning electron microscopy images silica hydrogel. Scanning electron microscopy images showed that the modified silica particles were distributed more evenly in the PNIPA matrix than the unmodified ones were and that the size of cell-like structure of the hydrogel decreased with increasing modified silica content. POLYM. ENG. SCI., 48:2439-2445, 2008. [C] 2008 Society of Plastics Engineers
Citation Details
Title: Property modulation of Poly(N-isopropylacrylamide) hydrogels by incorporation of modified silica.(Technical report)
Author: Myong Jo Ham
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: December 1, 2008
Publisher: Society of Plastics Engineers, Inc.
Volume: 48 Issue: 12 Page: 2439(7)
Article Type: Technical report
Distributed by Gale, a part of Cengage Learning
