Synthesis of Photocrosslinkable Chalcone-Bearing Polyphosphazenes

摘要

Cyclic and high polymeric phosphazenes that bear 3-(4-oxyphenyl)-l-phenyl-2-propen-l-one (4-oxychalcone) side groups have been prepared in order to study their photochemical behavior. Small molecule cyclic trimers of the general formula N3P3R5R' where R= phenoxy, 2,2,2-trifluoroethoxy, chloro and 4-oxychalcone and R'= 4-oxychalcone were synthesized in order to model the crosslinking reactions at the high polymer level. Single-substituent and cosubstituent polymeric phosphazenes NPRR'2n' where R= phenoxy, 2,2,2-trifluoroethoxy or 4-oxychalcone, and R'= 4-oxychalcone were also prepared. Their photolytic crosslinking was followed by ultraviolet spectroscopy.