Synthesis And Study Of New Optical Limit Materials With Easily Decentralized And Good Solubility Properties

In the past decades, laser technology is widely used in industry, medicine and military fields. Recently, based on the laser technology, the laser weapon was developed and put into use, from then on, the research of laser protection technology and materials became highly importance and should take it seriously and act aggressively. Among the various kinds of optical protective materials, the materials based on the third order nonlinear optics have the most outstanding performance. Unfortunately, the materials that ever used in laser protection field still exist some certain shortages. The inorganic materials is unevenly scattered in solvent because of the intense tend to aggregate of the nano particles; Meanwhile the organic materials have lower solubility because of their unique structures. The purpose of this work is focused on the exploitation of new laser protection materials, which prepared various organic/inorganic nano composite materials, metallic nano hybrid materials, microcapsule parcel nanometer materials and organic materials. The similarity of these materials has perfect solubility, dispersibility and optical limiting properties, which in favor of making films and industry applications of the materials.Our work in this thesis can be summarized as following:（1） First reported the preparing of nano particles of monodisperse and narrow distribution range Au-PAVS heterodimer via reversible addition-fragmentation chain transfer （RAFT） polymerization and Au-S methods. Then the nanoparticle of golden was immobilized on the surface of the PAVS via the bonds with the mercaptoacetic in the surface of the PAVS and it was dispersed in THF to prepare monodisperse Au-PAVS heterodimer. The results of optical limiting properties of the Au-PAVS heterodimer compared with PcZn shows the similar optical limiting properties. The conclusion can be obtained that the mechnism of the optical limmiting is excited state absorption according to the experimental resutlts of pump-probe technique. （2） The amphiphilic block copolymer of PAVS-b-PEG was synthesized via semi-RAFT polymerization, then the poor water soluble materials such as PcZn, porphyrin and C60 was successfully encapsulated with the PAVS via self-assembly to obtain water soluble and nonlinear optics material. All of the three encapsulations had good nonlinear properties and were appropriate for application in the area of optical limiting.（3） Studied the third-order nonlinearity performance and optical limiting of metallic nano hybrid materials. The FePt-Au and Ag-Fe₂O₃ composites hybrid materials were prepared by nucleation growth, both of the two composites have good dispersivity and controllable forms in solvent. We first reported that the structure of the nano composite hybrid materials could be controlled by the form of the raw material and the predecessor and the form of various nanowires, nanorods and nanooarticles was also obtained. Meanwhile, since the complementarity of the Au/FePt and Ag/Fe₂O₃ in the nonlinear optics properties, the prepared nano hybrid materials had excellent optical performance and were appropriate for application in the area of optical limiting.（4） To resolve the poor solunility of the 1,8-naphthalimide, we prepared several derivants of 1,8-naphthalimides which contained various alkane chains via the introduction of the hydrazone to the 1,8-naphthalimides. The formation of the intense“push-pull”via the combination of the introduced electron-donating group and the structure of the naphthalimide making the electron in the system could be easily transit,as a result, the obtained materials showed strong third nonlinear optics and optical limit. According to the result, the optical limit of the prepared materials was based on the excited state absorption.