Study On Synthesis Of TiO₂/PCL/PLA System Nanocomposites

Recently, the production amounts of biodegradable plastics sold in the market aregradually increasing. Especially, poly-（lactic acid）（PLA） and polycaprolactone （PCL）products have become the main products because of their biodegradability,hydrodegradability and the biorenewable profile. To synthesize poly（DL-lactide-ε-caprolactone）（PCLA） stent with lactic acid and ε-caprolactone, It that PCLA copolymer wasof good biocompatibility and the degradation rate could be adusted by changing thecompositions of the copolymer. It is suggested that PCLA copolymer is a potential materialfor using as cell scaffold in tissue engineering.Since nanoparticles have special property, incorporation of inorganic nanoparticles intopolymer matrix can greatly improve the performance of the matrix. The interfacial structure innanocomposites between the matrix and fillers plays an important role in determining theproperties of materials. Influence factor of the reaction condition was studied and also thestructure and properties of productions were investigated by means of FT-IR, TG, XRD TEMand tensile test.This thesis mainly consists of three major parts:Part one:The PCL grafted into silica spheres was synthesized by ROP of ε-CL with stannousoctoate as the catalyst. For the synthesis of TiO₂/PCL, The content of different TiO₂wasdispersed in ε-CL via ultrasonication for1hours and then melted at130C for20hours. in aN2atmosphere. From the experiment result: elasticity modulus234.431MPa, elongation atbreak510%and tensile strength27.441MPapart two:For the synthesis of TiO₂/PLA, The content of different TBT was dispersed in actic acid andthen melted at130C for20hours. in a N2atmosphere. From the experiment result:（1）Size ofTiO₂nanoparticles dispersed in the PLA matrix.（2）Comparison with PDF Cards Titaniumdioxide in the form rutile of existence Part three:The PCL/PLA grafted into silica spheres was synthesized by ROP of ε-CL and LA withstannous octoate as the catalyst. For the synthesis of TiO₂/PCL/PLA, The content of differentTiO₂was dispersed in ε-CL via ultrasonication for1hours and then melted at130C for20hours in a Vacuum conditions. From the experiment result: elasticity modulus269.25MPaMPa, elongation at break652%and tensile strength36.87MPa...