Original Contribution

Colloid and Polymer Science

, Volume 291, Issue 3, pp 725-733

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Witold FortuniakAffiliated withCenter of Molecular and Macromolecular Studies, Polish Academy of Sciences
  • , Stanislaw SlomkowskiAffiliated withCenter of Molecular and Macromolecular Studies, Polish Academy of Sciences
  • , Julian ChojnowskiAffiliated withCenter of Molecular and Macromolecular Studies, Polish Academy of Sciences Email author 
  • , Jan KurjataAffiliated withCenter of Molecular and Macromolecular Studies, Polish Academy of Sciences
  • , Adam TraczAffiliated withCenter of Molecular and Macromolecular Studies, Polish Academy of Sciences
  • , Urszula MizerskaAffiliated withCenter of Molecular and Macromolecular Studies, Polish Academy of Sciences

Abstract

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).

Keywords

PCM microcapsules Microencapsulation Microencapsulated phase change materials Polyhydromethylsiloxane Microcapsules Karstedt catalyst