Origin of porosity in arylene-bridged polysilsesquioxanes

Dale W. Schaefer, Greg B. Beaucage, Douglas A Loy, Tamara A. Ulibarri, Eric Black, Kenneth J. Shea, Richard J. Buss

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Citations (Scopus)

Abstract

We investigate the porosity of a series of xerogels prepared from arylene-bridged silsesquioxane xerogels as a function of organic bridging group, condensation catalyst and post-synthesis plasma treatment to remove the organic functionalities. We conclude that porosity is controlled by polymer-solvent phase separation in the solution with no evidence of organic-inorganic phase separation. As the polymer grows and crosslinks, it becomes increasingly incompatible with the solvent and eventually microphase separates. The domain structure is controlled by a balance of network elasticity and non-bonding polymer-solvent interactions. The bridging organic groups serve to ameliorate polymer-solvent incompatibility. As a result, when the polymer does eventually phase separate, the rather tightly crosslinked network limits domain size to tens of angstroms, substantially smaller than that observed in xerogels obtained from purely inorganic precursors where incompatibility drives phase separation earlier in the gelation sequence.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages301-306
Number of pages6
Volume435
StatePublished - 1996
Externally publishedYes
EventProceedings of the 1996 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 8 1996Apr 12 1996

Other

OtherProceedings of the 1996 MRS Spring Symposium
CitySan Francisco, CA, USA
Period4/8/964/12/96

Fingerprint

Polymers
Porosity
Xerogels
Phase separation
Gelation
Condensation
Elasticity
polysilsesquioxane
Plasmas
Catalysts

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Schaefer, D. W., Beaucage, G. B., Loy, D. A., Ulibarri, T. A., Black, E., Shea, K. J., & Buss, R. J. (1996). Origin of porosity in arylene-bridged polysilsesquioxanes. In Materials Research Society Symposium - Proceedings (Vol. 435, pp. 301-306). Materials Research Society.

Origin of porosity in arylene-bridged polysilsesquioxanes. / Schaefer, Dale W.; Beaucage, Greg B.; Loy, Douglas A; Ulibarri, Tamara A.; Black, Eric; Shea, Kenneth J.; Buss, Richard J.

Materials Research Society Symposium - Proceedings. Vol. 435 Materials Research Society, 1996. p. 301-306.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Schaefer, DW, Beaucage, GB, Loy, DA, Ulibarri, TA, Black, E, Shea, KJ & Buss, RJ 1996, Origin of porosity in arylene-bridged polysilsesquioxanes. in Materials Research Society Symposium - Proceedings. vol. 435, Materials Research Society, pp. 301-306, Proceedings of the 1996 MRS Spring Symposium, San Francisco, CA, USA, 4/8/96.
Schaefer DW, Beaucage GB, Loy DA, Ulibarri TA, Black E, Shea KJ et al. Origin of porosity in arylene-bridged polysilsesquioxanes. In Materials Research Society Symposium - Proceedings. Vol. 435. Materials Research Society. 1996. p. 301-306
Schaefer, Dale W. ; Beaucage, Greg B. ; Loy, Douglas A ; Ulibarri, Tamara A. ; Black, Eric ; Shea, Kenneth J. ; Buss, Richard J. / Origin of porosity in arylene-bridged polysilsesquioxanes. Materials Research Society Symposium - Proceedings. Vol. 435 Materials Research Society, 1996. pp. 301-306
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