Nano Of Tio <sub> 2 </ Sub> Of Tio <sub> 2 </ Sub> / Of Pmma Composites And Their Performance Study

Nano-TiO₂ is a new multi-function fine inorganic material with many excellent features, such as low melting point, magnetic strength, large specific surface area, and excellent light absorption properties and etc. So far, nano-TiO₂ is widely used as functional ceramics, printing ink, high-performance coatings, solar cells and other areas. However, how to solve the reunion of nano-TiO₂ has been a hot topic. Organic / inorganic hybrid nano-materials, nano-assembly and related technology in the preparation of novel nano-composite materials have been aroused great concern. Inorganic and organic phase with each other through the network structure; inorganic components can improve the performance of organic components or their function, beacause of the synergic action between inorganic and polymer nano synergy can strengthen the bond among the two-phase capacity. Makes the polymer-based inorganic hybrid materials have properties which common materials do not have: Optical properties, mechanical properties, catalytic properties, etc.This paper mainly studies with titanium tetrachloride as the raw material by hydrothermal synthesis method, as a reasult rod-shaped powder and doping LaCl3, EuCl3 rare earth ion nano-TiO₂ powder was prepared. Meanwhile, to study the dispersivity of nano-TiO₂ with oleic acid, methyl methacrylate modified nano-TiO₂ on the surface. To make PMMA/TiO₂ composites, by adding TiO₂ and which is doped of LaCl3, EuCl3 into PMMA with in-situ bulk polymerization. The mechanisms of organic modified and effects on polymer matrix for nano-TiO₂ particles were studied such as mechanics, thermodynamics, morphology and so on. The main findings are as follows:(1) By hydrothermal method successfully prepared a diameter of about 15nm, 200nm length about the uniform morphology of rutile TiO₂ nanoparticles. The TiO₂ nanoparticles doping with rare earth La and Eu were prepared with the same way . Doping of rare earth ions can increase the size of TiO₂ nanoparticles, particle shape also changed from rod to spherical and the specific surface is smaller. Rare earth doping on the TiO₂ further improve the yield rate of weight loss.(2) Different substances on the surface modified TiO₂ nanoparticles, nano-TiO₂ aggregation to solve the problem. It was found that oleic acid on the dispersion of TiO₂ nanoparticles have played a very good results, the best concentration of 0.1M and modified 0.2M, PMA TiO₂ nanoparticles on the dispersion effect is not obvious.(3)By adding TiO₂ nanoparticles to the PMMA inside, the use of FE-SEM, impact properties, bending properties, contact angle, transmittance test for performance testing of the hybrid material, it is found that nano-TiO₂ particles on the polymer material has a good toughening effect. With the increasing amount of TiO₂ added the matrix micro-cracks increased, resulting in larger contact angle. Nano TiO₂ particles will reduce the light transmission rate of PMMA. Using the same method to add the rare earth ion doped into PMMA-TiO₂ hybrid materials tested and it is found that rare earth ions La and Eu doped TiO₂ nanoparticles can reduce the toughening effect.