I&EC 199 |
| Baohua Yue1, Jun Yang2, Yulu Wang1, Chien-Yueh Huang3, Rajesh Dave4, and Robert Pfeffer3. (1) Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 161 Warren Street, Newark, NJ 07102, (2) New Jersey Center for Engineered Particulates, New Jersey Institute of Technology, Newark, NJ 07102, (3) Otto H. York Department of Chemical Engineering, New Jersey Institute of Technology, Newark, NJ 07102, (4) Department of Mechanical Engineering, New Jersey Institute of Technology, Newark, NJ 07102 |
| Polymeric particle encapsulation is an important industrial process. Conventional encapsulation technologies involve solution chemistry, producing air and water pollutants and causing environmental concerns. In this study, a new "green°± approach was employed for fine particle encapsulation. Crystalline Dechlorane particles of the size range from 1 to 30 micron were successfully encapsulated with PMMA via in-situ polymerization in scCO2. No organic solvent was used in this process and the down stream processing was simple. This process provides an alternative to the SAS type processes, as the new method renders uniform coating layers with complete coverage and controllable thickness, owing to the initial homogeneity of dispersed reactants and operation conditions that affect the kinetics of polymerization-induced phase separation. The morphologies of coating show strong dependence on the monomer to particle ratio: from thin-film coating to surface aggregations of fine polymer particulates. The effects of pressure, initiator concentration, and surfactant concentration on product morphology were also examined. |
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Industrial and Engineering Chemistry Posters
5:00 PM-7:00 PM, Tuesday, March 30, 2004 Anaheim Convention Center -- Hall A, Poster
Division of Industrial and Engineering Chemistry |