Synthesis and Characterization of some Main Chain Porphyrin Copolyformals, Based on Bisphenol-A and Long Linear Aliphatic Units, Having a Low Glass Transition Temperature

The synthesis of new high molecular mass copolyformals containing long linear aliphatic linkages and different amounts of porphyrin units in the main chain is described. The copolymers havebeen prepared by the condensation reaction between a large excess of dibromomethane and mixtures of1,12-dodecanedi(bisphenol A) ether (I) or 1,20-eicosanedi (bisphenol A)ether (II) and 5,10-bis(p-hydroxy-phenyl)-15,20-bis(p-dodecanoxyphenyl)porphyrin (III) in different molar ratio. The structural characteriza-tion of the resulting copolyethers has been performed by NMR and MALDI-TOF analysis. The average molecular mass values of the copolyethers determined by GPC have been compared with those obtainedby a recently developed off-line procedure of MALDI-TOF mass spectrum processing. Thermal propertiesof copolymers have also been examined. All collected data show that high molecular mass copolymers with a homogeneous arrangement of the porphyrin and aliphatic units along the molecular chains andwith a glass transition temperature depending on the aliphatic content in the molecules have beenobtained.