Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5189929 | Polymer | 2007 | 8 Pages |
Abstract
Poly(2-hydroxyethyl methacrylate-silica) hybrid materials with significantly lower volume shrinkage were synthesized by using acid-catalyzed sol-gel reactions of tetraethyl orthosilicate and free radical polymerization of 2-hydroxyethyl methacrylate (HEMA). The mechanical, thermal, and optical properties and internal porosities of the poly(HEMA-silica) hybrids with different silica contents (e.g., 15, 25 and 30Â wt%) were evaluated with the use of nanoindentation, microscratch, thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis, UV-vis spectrophotometer and N2 adsorption-desorption method. A silica percolation threshold was found at around 20-25Â wt%, beyond which a marked increase in the poly(HEMA-silica) hybrid hardness and modulus was observed as compared to pure poly(HEMA). Nanoindentation and scratch testing measurements also for the first time were introduced in characterizing poly(HEMA-silica) hybrid materials.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Shuxi Li, Apoorva Shah, Alex J. Hsieh, Ross Haghighat, S. Solomon Praveen, Indraneil Mukherjee, Elizabeth Wei, Zongtao Zhang, Yen Wei,