Re / Polymer Composites And Their Submicroscopic Structure And Luminescence, Radiation Shielding And Magnetic Properties Of The Relationship Between Research,

In this thesis, we firstly utilized the physical-chemistry characteristics of rare-earths to have prepared many organic rare-earth complexes with different properties and many all-purposed polymer composites doped with inorganic or organic rare-earth complexes in order to develop some value materials with novel luminescence, radiation protection or magnetism properties. Then we studied on the relationship of these materials' novel properties and structures in detail. At the same time, we used the JRG Forth-Statistic Theory to discuss the mechanism of some properties.On the study of the luminescence properties, the main success is that (1) we synthesized rare-earth tris-(2-thenoyltrifluoroacetone)-1,10-phenanthroline-acrylic acid (with reactive and high lighting properties, rare-earth tris-(2-thenoyltrifluoroacetone)-1,10-phenanthrolin (Re(tta)3phen) with high luminescent properties and samarium acrylic acid (Sm(aa)3) complex with reaction activity. The results showed that the Re(tta)2(aa)phen and Re(tta)3phen complexes all possessed high fluorescence emission intensity, the characteristic emission of RE ions were all observed. (2) In our work, we firstly attempted to combine the rubber and rare-earth complex to prepare the luminescent materials. The NBR could coordinated with rare-eath, SiR with good chemical stability and some other polymer matrixes were chosen to prepared novel fluorescent composites by blending with Re(tta)3phen(RE=Eu,Sm). (2)A new way of in-situ reaction to prepare rare-earth-doped-polymer composites was firstly mentioned in our work, and using this method we firstly made the Sm(aa)3/NBR (nitrile rubber) composite with high mechanical property and the Re(tta)2(aa)phen/NBR composites with high fluorescence. We observed that the fluorescence emission intensity of the cured material of Re(tta)2(aa)phen/NBR composite was higher several times than that of the uncured one. All kinds of macrostructure analysis (SEM,TEM and XRD) showed that the rare-earth organic complexes are homogenously and fined dispersed into polymer matrix by in-situ reaction. It indicates that in-situ reaction method is a feasible way to prepare rare-earth/polymer composites with high content of rare-earth organic complex, fine dispersion and high fluorescence intensity. On the study of radiation protection, the main success is that (1) we prepared four kinds of composites by blending LaCO3, PrCO3, Sm2O3 and Gd2O3 with rubber and we found that radiation shielding properties of these composites were increased with the adding contents of rare-earth and improved with the increasing of atomic number. (2) When the peroxide was used as vulcanizator, the particle size of Gd(aa)3 complex could be decreased and the distribution degree of Gd(aa)3 complex was increased, that result in the P value and tensile strength of composites was increased. We also found that polymer matrix also affected on the radiation properties of composites when the vulcanization system was same, the NR was better than NBR matrix.(3) When we used NR as matrix, we observed that Gd2O3 was more efficient than Gd(aa)3 at the same but little contents of Gd3+ ions. While the P value of Gd(aa)3/NR composite was higher than that of Gd2O3/NR composite as the contents of Gd3+ increasing. On the study of magnetism, the main success is that (1) Gd(ba)3 is a paramagnetic material at 300K, that is different with gadolinium which is one ferromagnetic material at low temperature. (2) Nd(aa)3 is also one paramagnetic material at 300K. (3) The two rare-earth complex magnetic torque is same as that of the rare-earth ions, which proves the magnetism of complexes root in rare-earth ions and there is no more relationship with coordination environment of ligands. (4) The Nd(aa)3/PU composites revealed paramagnetic properties, at the range of 5-300K the susceptibility is lower than of Nd(aa)3, which indicated that magnetism of composites lied on the contents of Nd3+ ions.On the study of the relationship of JRG sub-cluster parameters and Eu(tta)2(aa)phen/NBR composites' f...