Effects of pH value on synthesis of polyphenylpropiolic acid

Acetic acid of phenylpropiolic acid(PhPA) is an effective terminator,so PhPA can not be directly polymerized.After adding NaOH,the monomer is conversion into sodium salt.Then phenylpropiolic acid salt was polymerized into phenylpropiolic acid salt.With HCl acidification,we can get phenylpropiolic acid.The monomer was synthesized by the addition reaction of cinnamic acid with bromine and the followed elimination reaction.The structure and properties of both PhPA and PPhPA were confirmed by IR,UV,FS,GPC and TGA.The disappearance of the characteristic vibrations at 2212cm-1(C≡C) and the appearance of the characteristic vibrations at 1602cm-1(C—C) indicated the polymerization of monomers(Mw=10552) which has higher molecular weight and absorption spectra than without NaOH.On the fluorescence investigation of the polymer,the solutions of polymer emit blue light and show the peak emissions at 465 nm when excited at 375 nm.The polymer also has thermal stability.