Synthesis of a paraffin phase change material microencapsulated in a siloxane polymer

• Published in: Colloid and polymer science Vol. 291; no. 3; pp. 725 - 733
• Main Authors: Fortuniak, Witold, Slomkowski, Stanislaw, Chojnowski, Julian, Kurjata, Jan, Tracz, Adam, Mizerska, Urszula
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.03.2013; Springer; Springer Nature B.V
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Colloids; Complex Fluids and Microfluidics; Crosslinking; Exact sciences and technology; Food Science; Forms of application and semi-finished materials; Miscellaneous; Nanotechnology and Microengineering; Original Contribution; Paraffins; Phase change materials; Physical Chemistry; Polymer industry, paints, wood; Polymer Sciences; Polysiloxanes; Shells; Siloxanes; Soft and Granular Matter; Stabilization; Technology of polymers; Microcapsules; PCM microcapsules; Microencapsulation; Microencapsulated phase change materials; Karstedt catalyst; Polyhydromethylsiloxane; Molecular structure; Phase change; Microcapsule; Crosslinking; Hydrosilylation; Experimental study; Paraffin; Morphology; Alkane; Crosslinked polymer; Kinetics; Manufacturing; PCM material; Siloxane polymer
• ISSN: 0303-402X; 1435-1536
• DOI: 10.1007/s00396-012-2782-z

The coemulsification method suitable for the formulation of microcapsules of n -eicosane coated with a polysiloxane is developed. This method allows to synthesize core–shell microcapsules of paraffin which have the shape of spheres or distorted spheres and are designed for the use as phase change materials. The microcapsules are formed in aqueous phase by the precipitation of n -eicosane together with modified polyhydromethylsiloxane from a common solvent which is miscible with aqueous media. The polysiloxane is modified by the attachment of silylvinyl and alkoxy functions before coemulsification with the paraffin. It also contains the Pt(0) Karstedt catalyst. The microcapsules formed by coemulsification are stabilized by the in situ cross-linking of the polysiloxane shell. The shell is additionally modified by the in situ generation of silanol groups which provide colloidal stabilization of microspheres in aqueous phase. Microcapsules were studied by DSC, SEM, optical polarized microscope, and by thermooptical analysis (TOA).