Diels-Alder Polymerization of AB-Monomers Containing Benzocyclobutene and Alkyne Units
Final rept. 1 Sep 1984-30 Mar 1986
DAYTON UNIV OH RESEARCH INST
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A novel class of aromatic imide AB-monomers with benzocyclobutene and an alkyne primarily phenylethynyl group as the reactive units have been prepared. The monomers have been utilized in the thermally induced Diels-Alder polymerizations. The differential scanning calorimetric study of the aforementioned AB-monomers provided two observations 1 primary acetylene began its homo-polymerization 202 C max. before the electrocyclic ring-opening of benzocyclobutene 270 C max. 2 the phenoxy group connecting between phenylacetylenyl group and the aromatic imide fragment suppressed polymerization in Diels Alder fashion. Furthermore, thermoxidative stability evaluation on the cured samples 250 C for 8 hrs and then 350 C for another 8 hrs, under nitrogen atmosphere, carried out at 650 F air for 200 hrs, indicated the more rigid phenylethynyl phthalimide system was the most heat-resistant. Keywords Butenes, Polymers, High Temperature, Imides, AB-Monomers.
- Polymer Chemistry