Accession Number:

ADA409490

Title:

Mechanical Relaxation and Microstructure of Poly(norbornyl-POSS) Copolymers

Descriptive Note:

Technical paper

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST

Report Date:

1998-08-11

Pagination or Media Count:

38.0

Abstract:

The mechanical relaxation behavior and microstructure of a series of novel norbornyl-POSS organic-inorganic copolymers have been investigated. Furthermore, we examined the influence of weight fraction of POSS-norbornyl monomer, as well as the potential sensitivity to the seven organic corner groups present in each POSS macromer. POSS refers to the Polyhedral Oligomeric Silsesquioxane inorganicorganic macromer, which is composed of an inorganic Si8O12 spherical core surrounded with seven inert organic corner groups and one reactive norbornyl moiety. It was observed that POSS copolymerization enhances the alpha-relaxation temperature, T sub alpha, however, the magnitude of this dependence is larger for the POSS-norbornyl comonomer possessing cyclohexyl corner groups cyPOSS than for the copolymer with cyclopentyl corner groups cpPOSS.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE