Mesh size control of organic-inorganic hybrid gels by means of a hydrosilylation co-gelation of siloxane or silsesquioxane and α,ω-non-conjugated dienes

Naofumi Naga, Emiko Oda, Akinori Toyota, Hidemitsu Furukawa

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Organic-inorganic hybrid gels have been synthesized by means of co-gelation of multi-functional cyclic siloxane, 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS), or cubic silsesquioxane, 1,3,5,7,9,11,13,15-octakis(dimethylsilyloxy) pentacyclo-[9,5,1,1,1,1]octasilsesquioxane (POSS), as crosslinking reagents with α,ω-non-conjugated dienes, a hexa-1,5-diene (HD) and deca-1,9-diene (DD) mixture, using hydrosilylation reaction with Pt catalyst. Network structures of the resulting co-gels have been quantitatively characterized by means of a novel scanning microscopic light scattering system. The feed ratio of HD to DD strongly affects the gelation and mesh size of the co-gels. The critical concentration of gelation has maximum values in the co-gelation with a feed ratio of [HD]/[DD] = 1. The mesh-size of the resulting co-gels underwent changes with the [HD]/ [DD] ratio in the feed, and the structure (geometry) of the crosslinking reagents affect the trend of the mesh size change. The TMCTS-HD/DD co-gel obtained with a feed ratio of [HD]/[DD] = 1, showed the minimum mesh size. Whereas the mesh size of the POSS-HD/DD co-gel increased with an increase of DD in the feed ratio. The mesh-size distribution of the co-gels was narrower than the gels synthesized from single α,ω-non- conjugated dienes. Co-gelation of a TMCT/POSS-DD system was also investigated, and the critical gelation concentration showed maximum values for the co-gelation with a feed ratio of [TMCTS]/[POSS] = 1. The mesh size of the co-gel increased with increasing POSS ratio in the feed.

Original languageEnglish
Pages (from-to)2331-2338
Number of pages8
JournalMacromolecular Chemistry and Physics
Volume208
Issue number21
DOIs
Publication statusPublished - 2007 Nov 5

Keywords

  • Gelation
  • Hydrosilylation co-gelation
  • Networks
  • Organic-inorganic hybrid gel
  • Scanning microscopic light scattering
  • Siloxane
  • Silsesquioxane
  • α,ω-non- conjugated diene

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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