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Microencapsulation of alkaline salt hydrate melts for phase change applications by surface thiol-michael addition polymerization

: Platte, Daniela; Helbig, Uta; Houbertz, Ruth; Sextl, Gerhard


Macromolecular materials and engineering 298 (2013), Nr.1, S.67-77
ISSN: 1438-7492
ISSN: 1439-2054
Fraunhofer ISC ()

The microencapsulation of alkaline salt hydrates suitable as inorganic phase change materials (PCMs) via surface Michael-type addition polymerization of thiols and acrylates is reported. The encapsulation performance depending on the resins' acrylate-to-thiol ratio and monomer functionality is investigated, and the best encapsulation performance is found for resin compositions with considerable acrylate excess ratios. The step-growth nature of the reaction can be substantiated via comparative bulk polymerizations. A multistage encapsulation mechanism is proposed in order to explain the different dependencies on the acrylate to thiol ratio observed in PCM encapsulations in comparison to bulk polymerizations.