Process–Structure–Property Relationships for Porous Membranes Formed by Polymerization of Solid Monomer by a Vapor-Phase InitiatorClick to copy article linkArticle link copied!
- Golnaz DianatGolnaz DianatMork Family Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089, United StatesMore by Golnaz Dianat
- Nareh MovsesianNareh MovsesianMork Family Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089, United StatesMore by Nareh Movsesian
- Malancha Gupta*Malancha Gupta*E-mail: [email protected] (M.G.).Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, Los Angeles, California 90089, United StatesMore by Malancha Gupta
Abstract
We determine the mechanism that governs polymerization during a process in which solid monomer is polymerized with a vapor-phase initiator. Gel permeation chromatography data show a bimodal molecular weight distribution at all processing conditions which can be attributed to two different polymerization mechanisms. Smaller chains form by polymerization at the vapor–solid interface, and larger chains form by polymerization within the solid. The monomer mobility and sublimation rate affect the polymerization rate and thereby affect the membrane structure. The molecular weight of the larger chains can be increased by increasing the polymerization temperature and the polymerization time. The ability to vary the polymerization time allows for tuning the solubility of the membranes. The process–structure–property relationships elucidated in this study can enable the fabrication of porous polymer membranes for applications in filtration, textiles, and sensors.
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