A series of styrene-co-lanthanum maleate ionomers(SMA-La)with different lanthanum ion(La3+)content were prepared and characterization.The process of preparation included 4 steps,i.e.copolymerization of styrene and maleic anhydride,hydrolysis of the copolymer,alkalization of the copolymer and ion exchange of Na+and La3+.The structure of SMA-La were characterized by FTIR and DSC and the lanthanum ion(La3+)content of SMA-La ionomer was determined by titration method of EDTA,it was found that the lanthanum ion(La3+)content of the solution did not exhchange to the SMA chains completely.Meanwhile,the effect of static thermal stability of SMA-La ionomer and its synergistic effect with calcium zinc stabilizerits on polyvinyl chloride(PVC)were investigated by Congo red test,and the corresponding mechanism of action was discussed.The results suggested that SMA-La ionomer was a novel potent stabilizer for PVC and its derivatives,and SMA-La ionomer improved the thermal stability of PVC through the comprehensive effect of coordination,substitution,elimination and absorption.
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