- Author
- Ishida, H.
- Title
- Polybenzoxazines: A New Class of High Performance, Ring-Opening Phenolic Resins That Expand Upon Polymerization. BFRL Fire Research Seminar. VHS Video.
- Coporate
- Case Western Reserve Univ., Cleveland, OH
- Report
- Video, December 21, 1998,
- Keywords
- polymerization
- Abstract
- In this lecture, development of a class of new polymers, polybenzoxazines, will be described. Benzoxazine monomers can be prepared from the combination of any phenolic derivatives, formaldehyde, and primary amines. They undergo thermally initiated ring-opening polymerization to form hyperbranced or crosslinked polymers. Polybenzoxazines possess rich molecular design flexibility that is more versatile than epoxy resins in addition to superb balance of mechanical and physical properties. These properties are comparable or superior to advanced epoxy resins, phenolic resins, bismaleimides, and polyimides, depending on the components of choice. Synthesis, molecular characterization, rheology, and mechanical and physical properties will be described. Of particular interest is the unusual properties exhibited by the polybenzoxazines. Those include volumetric expansion or near zero shrinkage upon polymerization, extremely high char yield, low water absorption in spite of high concentration of hydrophilic groups, and fast development of mechanical and physical properties at very early conversions. The molecular origin of these unusual properties will be discussed. Potential for applications in electronic packaging, aerospace materials and others will be mentioned.