Thermoplastics modified with nanoscale inorganic macromers

T. S. Haddad, P. T. Mather, H. G. Jeon, A. Romo-Uribe, A. R. Farris, J. D. Lichtenhan

Research output: Contribution to journalConference articlepeer-review

14 Scopus citations

Abstract

We have taken a unique approach to the synthesis and study of hybrid organic/inorganic materials. Our method involves synthesizing nano-size inorganic P1R7Si8O12 clusters which contain seven inert 'R' groups for solubility and only one functional 'P' group for polymerization. This strategy permits the synthesis of melt processable, linear hybrid polymers containing pendent inorganic clusters and allows us to study the effect these clusters have on chain motions and polymer properties. The synthesis of norbornenyl-based polyhedral oligomeric silsesquioxane (POSS) macromers, their ring opening metathesis copolymerizations with varying amounts of norbornene, and analysis of the effect of the pendent POSS group is presented. The mechanical relaxation behavior and microstructure of norbornyl-POSS hybrid copolymers have been examined for their dependencies on the mole fraction of POSS-norbornyl monomer, as well as for potential sensitivity to the seven inert 'R' groups present in each POSS macromer. POSS copolymerization is observed to enhance the α-relaxation temperature, Tα, in proportion to the mole fraction of POSS-norbornyl comonomer. Interestingly, however, the magnitude of this dependence is larger for POSS-norbornyl comonomer possessing cyclohexyl groups (CyPOSS) than for cyclopentyl groups (CpPOSS). While POSS copolymerization yields only slight enhancement of the tensile storage modulus measured near room temperature, at temperatures lower than a strong mechanical relaxation (β-relaxation near T = -75°C), there is a significant POSS-reinforcement of the storage modulus.

Original languageEnglish (US)
Pages (from-to)381-386
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume519
StatePublished - Dec 1 1998
EventProceedings of the 1998 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 13 1998Apr 17 1998

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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