Resin and carbon foam production by cationic step-growth polymerization of organic carbonates

• Main Authors: Wöckel, L., Seifert, A., Mende, C., Roth-Panke, I., Kroll, L., Spange, S.
• Other Authors: Royal Society of Chemistry,
• Format: Article
• Language: English
• Published: Universitätsbibliothek Chemnitz 2017
• Subjects: Carbonate; Schäume; kationische Stufenwachstumspolymrisation; Anisolharze; poröse Kohlenstoffe; Carbonates; foams; cationic step-growth polymerization; anisolic resins; porous carbon; ddc:540; Schaum; Polymerisation; Kohlenstoff
• Online Access: http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-220096; http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-220096; http://www.qucosa.de/fileadmin/data/qucosa/documents/22009/c6py01572g.pdf; http://www.qucosa.de/fileadmin/data/qucosa/documents/22009/c6py01572g1.pdf; http://www.qucosa.de/fileadmin/data/qucosa/documents/22009/signatur.txt.asc

Acid induced step-growth polymerizations of bis(p-methoxybenzyl) carbonate (pMBC), bis(m-methoxybenzyl) carbonate (mMBC) and difurfuryl carbonate (DFC) have been performed to produce resin-foams, because controlled release of carbon dioxide takes place during polymerization of those organic carbonates. The monomers are polymerized in bulk using p-toluene sulfonic acid (pTS) as a catalyst. The volume development of the foams is assisted by use of an appropriate surfactant and the crosslinking agent 1,3,5-trioxane as co-components. A portion of carbon dioxide release is a function of the carbenium stability of the reactive intermediate derived from the monomer; DFC > pMBC ≫ mMBC. Resins derived from mMBC can be post-treated to release carbon dioxide after polymerization. The molecular structures of the resulting materials are investigated by solid state 13C-NMR spectroscopy and IR spectroscopy. Scanning electron microscopy was used to study foam morphology. The carbon dioxide release was monitored with TG-MS analysis. Finally, the polymer foams have been converted into carbon foams and investigated by means of mercury porosimetry. === Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.