2-CARRIER LIQUID-PHASE SYNTHESIS OF MAIN-CHAIN LIQUID-CRYSTALLINE OLIGOMERS AND CHARACTERIZATION OF THE PRODUCTS

Monodisperse oligomers were synthesized from terephthalic acid and 1,4 -phenyloxy-1,10-decamethyleneoxy-1,4-phenylene] using a polyethylene g lycol support. Isolation of the target oligomers was achieved by use o f a second soluble carrier which could be introduced and cleaved selec tively, thus allowing to characterize the product chain in solution. T he structures of the oligomers were assigned and identified using a co mbination of analytical methods such as electron impact mass spectrome try, IR- and H-1-NMR spectroscopy and temperature-resolved pyrolysis-f ield ionization mass spectrometry (Py-FIMS).