Novel Polymeric Composites Through Molecular Engineering
Abstract
Some final studies during this period were carried out in collaboration with Wright-Patterson AFB. They were based on some benzoxazole copolymers of good thermo-oxidative stability and solubility in tetrahydrofuran. The hydroxypolybenzoxazoles employed were reacted with an isocyanatosilane coupling agent and the hybrid consequently with in-situ produced silica. The resulting hybrid films containing one third silica were transparent. The mechanical properties of the hybrid materials were highly dependent on the nature of the organic polymers. In general, the tensile modulus of the hybrid materials increased with addition of silica but, as in the case of the polyamides, the elongation at break decreased at higher silica contents. Future work will focus on new polymers, additional physical properties, and new processing techniques. The new polymers will include benzoxazole polymers being prepared at Wright-Patterson AFB with structural changes to improve tractability and alternative functional groups to improve bonding to ceramic phases. Examples of new physical properties of importance are thermal expansion coefficients and impact strengths. New processing techniques to be sought include methods for densifying cameras prepared from glassy polymers such as poly(methyl methacrylate), and preparing organic-inorganic aerogels by supercritically drying some of the hybrid composites from the gel state.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1994
- Accession Number
- ADA284168
Entities
People
- James E. Mark
Organizations
- University of Cincinnati