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Unformatted text preview: EMA 4161C PHYSICAL PROPERTIES OF POLYMERS HYDROGEL SYNTHESIS AND CHARACTERIZATION LABORATORY 1.0 PURPOSE To experimentally determine the average molecular weight between crosslinks, equilibrium water content and Youngs modulus of two different hydrogel formulations. 2.0 LAB PREPARATION 2.1 Read Section 9.12 The Flory-Rehner Equation in Introduction to Physical Polymer Science (Sperling, 2006). 2.2 Print out hydrogel formulas for 50wt% and 80wt% PEGDMA. 2.3 Print out spreadsheets for recording hydrogel data. 3.0 DEFINITIONS AND ACRONYMS 3.1 PEGDMA: Poly(ethylene glycol) dimethacrylate 3.2 PDMSe: Polydimethylsiloxane elastomer 3.3 APS: Ammonium persulfate 3.4 AA: L-ascorbic acid 4.0 MATERIAL LIST 4.1 PEGDMA (M n 1000), Catalog # 15178, Polysciences, Inc. (Eppelheim, Germany) 4.2 Hexanes 4.3 AA 99+%, Catalog # 2556-4 Sigma-Aldrich (Milwaukee, WI) 4.4 APS Catalog # 24861-4 Sigma-Aldrich (Milwaukee, WI) 4.5 Deionized water 4.6 PDMSe gasket 4.7 Glass plates 4.8 Large (2) binder clips 4.9 3 small glass beakers 4.10 Stir plate and stir bar 4.11 10mL glass pipettes 4.12 15mL centrifuge tubes 4.13 Transfer pipette 4.14 Analytical Balance, Mettler Toledo or equivalent 4.15 Weigh paper 4.16 Centrifuge, Fisher Scientific Centrific Model 228 or equivalent 4.17 Stainless steel wire 4.18 Circular punch 4.19 12 50mL centrifuge tubes with rack 4.20 Vacuum oven 5.0 HYDROGEL SYNTHESIS 5.1 Gather all materials. 5.2 For this lab we will divide into two groups. One group will make and characterize a PEGDMA hydrogel with 50wt% PEGDMA and the other group will make and characterize a PEGDMA hydrogel with 80wt% PEGDMA. 5.3 Enter total amount of polymer precursor solution and wt% PEGDMA into the spreadsheet below to calculate the amount of each component needed....
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This note was uploaded on 07/17/2011 for the course EMA 4161c taught by Professor Staf during the Fall '10 term at University of Florida.
- Fall '10