Processing parameters for electrospun Polyvinylalcohol (PVA) nanofibers and UV-crosslinking of modified PVA nanofibers

POLY 330

Andreas Greiner1, Jun Zeng2, Joachim H. Wendorff2, and Haoqing Hou3. (1) Department of Chemistry and Material Science Center, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany, (2) Department of Chemistry and Material Science Center, Philipps-University Marburg, Hans-Meerwein-Strasse, Marburg, D-35032, Germany, (3) Dept. Chemistry, Philipps-University Marsburg

Electrospinning behavior of PVA aqueous solutions (fully hydrolyzed) was investigated. It is found that fiber morphology and size depend on solution concentration, PVA molecular weight, molecular weight distribution of PVA, and additives (surfactants etc.). Photo-curable PVA nanofibers were obtained by chemical modification of PVA. A partially esterified PVA containing thienyl acrylate groups (PVA-Thio) was synthesized, which proved to be highly sensitive to UV irradiation. Under UV irradiation (wavelength > 300 nm) for 3 min, the PVA-Thio nanofibers electrospun from 10 wt % PVA-Thio aqueous solution could endure 95C steam for 1 h. An alternative approach for crosslinking PVA nanofibers is to incorporate a photo-crosslinking agent, tetraethyleneglycol dimethacrylate (TEGDA), into PVA electrospinning solution. The as-spun PVA/TEGDA composite fibers proved to be water-stable after UV irradiation. The irradiation time necessary for enough crosslinking varied from 50 sec to 5 min, depending on the composition of PVA/TEGDA.


Polymeric Nanofibers
5:30 PM-7:30 PM, Tuesday, September 9, 2003 Hilton New York -- Rhinelander Center, Poster

Division of Polymer Chemistry
The 226th ACS National Meeting, New York, NY, September 7-11, 2003