Study On Polymer Modification And Performance Of Carbon Nanotubes

Perfect hexagonal structure composed of pure carbon atoms endows carbon nanotube?CNT?excellent chemical,physical,and mechanical stabilities.Therefore,CNT has attracted great research interest and been extensively explored for different applications such as catalysis materials science,environmental technology,energy research and so on.However,their poor dispersibility,prone to aggregation and deposition often deteriorates their performance of relevant materials.To achieve better performance,surface modification of CNT is generally required to overcome its intrinsic drawbacks.Currently a variety of techniques,which can be roughly divided into covalent and non-covalent methods,have been established for modifying the surface properties of CNT.Compared with the covalent method,the non-covalent interactions,including hydrophobic,?-?stacking and van der Waals interactions,prove to be more convenient,flexible and mild,more importantly bringing no damage to the original structure of CNT.The major challenge of non-covalent method is to screen a compound for high functionalization degree and robust decoration of CNT.The thesis describes a facile approach for non-destructive functionalization of CNT via mussel inspired chemistry and following SI-ATRP method.A series of characterization?FT-IR?TG?TEM?XPS?indicated that the synthesized P?TA-TETA?and PCHA as a binding agent between CNT and post grafted polymer brushes,not only shows excellent adhesive properties on CNT,but also provides abundant-OH and-NH₂groups for post functionalization of CNT.PH-responsive PDMAEMA brush was successfully grafted from CNT-P?TA-TETA?to modulate the pH-responsive property of CNT as well as to deposit Au nanoparticles for 4-nitrophenol reduction.After 140 min,the catalytic reaction finished.And With abundant highly reactive epoxy groups,the PGMA-grafted CNTs could serve as a versatile platform for further modification or functionalization.Ethylenediamine ligands were facilely introduced,imparting the functionalized CNTs with record-high adsorption ability toward Cr?VI?among CNTs composites.Hopefully,the novel strategy would provide new opportunities for surface engineering of graphene and other materials for advanced applications.Secondly provide another powerful proof for the hypothesis that the coexistence of catechol and amine groups may be crucial for achieving adhesion to a wide range of materials.