Investigation of Tg in crosslinked methacrylate resins using DSC and fluorescence spectroscopy

POLY 122

Sunil Kulkarni, sunil@temple.edu1, Stephanie L. Wunder, slwunder@temple.edu1, and George Baran, grbaran@temple.edu2. (1) Department of Chemistry, Temple University, 1901 N. 13th Street, Philadelphia, PA 19122, (2) Center for Bioengineering and Biomaterials, College of Engineering, Temple University, 1947 N. 12th Street, Philadelphia, PA 19122
Fluorescence probes are used to detect glass transition temperatures, Tg, in linear glassy polymers near interfaces, such as in ultrathin films or under nanoscale confinement. The change in slope of the fluorescent intensity with temperature can sometimes be correlated with Tg, depending on the strength of Tg, the type of probe and its interaction with the polymer of interest. Since many composites are prepared from glass fillers and crosslinked resins, in which the interphase region is of interest, it would be useful to determine whether changes in Tg or crosslink density in the bulk, and subsequently at the interface, could be invested using fluorescence techniques. We have prepared a series of lightly crosslinked methacrylate based resins from methyl methacrylate (MMA)/triethylene glycol dimethacrylate (TEGDMA) or MMA/bisphenol A glycidylmethacrylate (BisGMA), in which a Tg could be observed calorimetrically, and measured the temperature dependent fluorescence using pyrene or the intrinsic fluorescence of BisGMA
 

General Papers: Polymers in Nanotechnology
6:00 PM-8:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Polymer Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006