Synthesis And Characterization Of Polyester/Titanium Organic-inorganic Hybrid Coating Materials Via In-situ Fabrication

Nowadays the functionalization of coating is an important research area. Organic-inorganic hybrid materials have promisingly potential application since they could combine the good properties of organic materials and inorganic materials.In order to enhance the scratch resistance and UV shielding property,the organic-inorganic hybrid has got a lot of focus.The dispersion and combination with matrix of inorganic particles limits the properties of organic-inorganic hybrid materials directly and becomes bottleneck restriction of their development.Recently,titanium organic-inorganic hybrid coatings have been developed quickly.However,to introduce titanium into polyester coating matrix via in situ fabrication is not reported.Therefore,it has important academic and industrial significance to prepare polyester hybrid coatings with good dispersion and excellent functional performance of titanium.In this dissertation,in order to obtain polyester hybrid coating materials with good scratch resistance and UV shielding property,polyester/titanium organic-inorganic hybrid resins and coatings with good dispersion of titanium and good transparence were prepared via in situ fabrication（ISF）.The influence on mechanical property and functional performance of polyester coatings and their films was investigated and the morphology and interaction of titanium and polyester of the hybrid coatings were characterized.Meanwhile,polyester/TiO₂ composite resins and coatings were prepared and characterized via in situ polymerization of ultra sonic dispersion（ISPU） as comparison.The main results obtained were as follows:1.Uniform and transparent polyester/titanium hybrid resins and coatings were obtained via ISF.Tetrabutyl titanate（TBT） had distinct catalytic activity in the particular polyester system to largely shorten the esterification and polymerization time.According to the desire of formulation and study on transparence and fluidity of products,it could be also concluded that the titanium concentration（converted to TiO₂ component of the same mol） of 1.5%wt could be suggested as better experimental condition.2.Titanium which was formed by in-situ hydrolysis of precursor TBT was homogeneously dispersed into polyester/titanium hybrid resins and coatings via ISF. Titanium was spherical or sheet and the average size was mostly between 100nm and 200nm.3.Titanium had connected with polyester matrix by chemical bonds in polyester/titanium hybrid resins and coatings prepared via ISF.The reaction of precursor TBT in the system was not only hydrolysis but also reaction with polyester matrix to obtain branched structure.4.Titanium had improved the mechanical properties such as pencil hardness and scratch resistance and UV shielding property of polyester matrix in the particular polyester system prepared via ISF.5.The synthesis method of ISF was more convenient than that of ISPU and could obtain uniform and transparent products.TBT had distinct catalytic activity in the particular polyester system prepared via ISF which could shorten the period of preparation and reduce the cost.Compared with the products of ISPU,there were smaller particles,less agglomeration and better dispersion in polyester hybrid system prepared via ISF,showing that ISF was more suitable than ISPU in a low titanium concentration.Titanium had connected with polyester matrix by chemical bonds and had improved the scratch resistance in the particular polyester system prepared via ISF.However,nano TiO₂ which was introduced via ISPU hadn’t enhanced the scratch resistance of polyester system. 6.As a conclusion,ISF has important industrial value to enhance the scratch resistance and UV shielding property of polyester/titanium organic-inorganic hybrid coating materials...