Study On The Preparation And The Properties Of High Luminescent Rare Earth Complex/Rubber Composites

This thesis is mainly composed of the synthesis of rare-earth complexes and the preparation of rare-earth complex/rubber composites.Firstly, three types of rare earth organic fluorescent complexes: Sm(AA)3,RE(TTA)3phen and RE(TTA)2(AA)phen(RE=Eu,Sm) have been synthesized and characterized. These complexes have been fully studied by Scanning Electron Microscope, Transmission Electron Microscope, X-ray Diffraction and fluorescence spectrometer, etc. The results show that all the rare earth organic complexes have pretty good fluorescent properties; most of them can emit the characteristic peaks of Eu3+ or Sm3+. It should be pointed out that the RE(TTA)2(AA)phen complexes also have polymerization ability.Secondly, by processing blending, in-situ reaction and sol-gel methods all these complexes have been used to produce a series of rare earth organic complex/polymer composites with high-qualified fluorescent property. They are Sm(AA)3/NBR, RE(TTA)3phen/NBR, RE(TTA)3phen/PMMA, RE(TTA)3phen/PDMS, RE(TTA)3phen/SiO2, RE(TTA)2(AA)phen/NBR, RE(TTA)2(AA)phen/SiO2/PDMS, RE(TTA)3phen/SiO2/PDMS and RE(TTA)2(AA)phen/SiO2, etc. The composites have been characterized by SEM, TEM and XRD. The fluorescent and mechanical properties of the composites also have been studied. The results of SEM and TEM show that the particles of the rare earth organic complexes in the RE(TTA)3phen/NBR, RE(TTA)3phen/PDMS and RE(TTA)3phen/PMMA composites, which were prepared by processing blending method, dispersed uniformly into the polymer matrixes. The fluorescent intensity of these composites increases with the increase of the contents of the rare earth organic complexes and no 'fluorescence quenching' has been observed. Interestingly, when the content of the complexes reaches up to 13% (wt%), the fluorescent intensity of the RE(TTA)3phen/NBR composites has surpassed the pure complexes.As for the Sm(AA)3/NBR and RE(TTA)2(AA)phen/NBR, which were prepared by in-situ reaction method, the results of SEM and TEM show that the complexes particles in the cured composites are much smaller and lesser than those in the uncured compound. Moreover, the fluorescent intensity of the cured composites is almost twice that of the uncured compounds and no 'fluorescence quenching' phenomena were observed at fairly high levels of complexes contents. The results of the mechanical properties study of Sm(AA)3/NBR show that the products of the in-situ reaction can strongly reinforce the NBR matrix.Additionally, the composites RE(TTA)2(AA)phen/SiO2 and RE(TTA)3phen/SiO2, prepared by sol-gel method, have stronger fluorescent intensity with higher contents of the rare earth organic complexes and no 'fluorescence quenching' has been observed.