Polymeric Systems Which Expand on Polymerization for Use in High Strength Composites.
Abstract
Ring-opening polymerizations usually involves somewhat less shrinkage than either addition or condensation polymerization because for every new bond that is formed involving a shift from a Van der Waals' dis- tance to a covalent distance, another bond is broken involving a shift from a covalent distance to a near Van der Waals' distance. If mono-mers were utilized in which two or more bonds were broken for every new bond that is formed in the polymerization process, near zero shrinkage or even expansion would be possible. Among the monomers that give essentially zero contraction or some expansion on polymeriza- tion are the spiro ortho esters, spiro orthocarbonates, and bicyclo ketal lactones. These monomers by undergoing some expansion or polymerization can be utilized in precision castings, high strength adhesives, prestressed construction, and dental fillings. (Author, modified-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1973
- Accession Number
- AD0772150
Entities
People
- William J. Bailey
Organizations
- University of Maryland