Synthesis and Characterization of a Series of Alternating Copolymers (Oligomers) Containing Organophospha-lambda5-azene Backbone Moieties
Abstract
The Staudinger reaction of bis(diphenylphosphino)alkyl or aryl compounds with 1,4-diazidobenzene at room temperature in benzene solution was shown to produce poly (organophospha (Lambda 5) azenes), which are alternating copolymers (oligomers) with the general formula (=P(Ph)2-R-P(Ph)2=N-C6H4-N=)n where R= (CH2)n, = 2-5, or R=p C6H4. The CP/MAS 13C and 31P NMR spectra were consistent with the proposed structures and showed a small amount of P=O end groups in addition to the P=N 31P resonances. The diffuse reflectance FT-IR spectra showed the typical P=N absorptions characteristic of phospha Lambda 5 azenes along with some azido end group absorptions. The thermogravimetric analyses (TGA) of these polymers showed that they were reasonably thermally stable up to about 300 C, and differential scanning calorimetry (DSC) provided the glass transition temperatures, Tg. The Tg's for the polymethylene containing polymers were in the range 103-124 C and appeared to decrease with increasing length of the polymethylene chain. Approximate molecular weights of these insoluble polymers were obtained by end group analysis using the integrated areas from the 31P NMR spectra (ratio of P=O and P=N groups) and assuming that P=O and N3 were the end groups.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 03, 1989
- Accession Number
- ADA206592
Entities
People
- Mark W. Victor
- Martin Poerantz
Organizations
- University of Texas at Arlington