Study On Functionalized Compodite Materials For Fused Deposition Modeling

In recent years,3D printing technology has been flourished.With its advantages of personalized customization and material economy,it is widely used in biomedical,automobile manufacturing,industrial design and other fields.The application level is gradually developed from theoretical models to customized auxiliary tools,which proposes higher demands on 3D printing technology.In the field of 3D printing technology,raw material is a key factor that has great effects on the performances of 3D-printed products.Therefore,the development of new functional materials for 3D printing is of great significance.This dissertation focuses on the most widely used 3D printing technology,fused deposition modeling(FDM),which prepared a series of functional 3D-printed materials by melt blending.The main research contents are as follows:1.Based on ABS,a series of materials with high strength for 3D printing were prepared.POSS molecules with various reactive groups,including amino or epoxy groups,were synthesized.Then modified ABS materials by grafting glycidyl methacrylate(GMA)or maleic anhydride(MAH)were melt blended to obtain composites for fused deposition modeling.Since both modified ABS and POSS had active groups,they had good interfacial compatibility.The sizes of POSS molecules were nano-scaled and not easy to reunite,which did not cause clogging of the printing nozzle.Products printed using ABS/POSS composites had excellent mechanical properties.These researches are promising to extend applications of ABS in industrial 3D printing.2.Based on PCL,a series of low-temperature 3D printing materials with antibacterial and biocompatible properties were prepared.To solve the problems of low melt strength,slow molding speed and poor molding precision when PCL was used as 3D printing material,PCL-based FDM materials with good 3D printing performances and functions were prepared by blending modification.According to this method,different kinds of additives,such as organic antibacterial agents with low decomposition temperature and bone-promoting substances,could be added into the PCL matrix to prepare functionalized low-temperature FDM materials with antibacterial or biocompatible properties.These materials are hopeful to play important roles in biomedical field.3.PVA-based water-soluble FDM supporting materials were prepared.In view of the poor thermal stability of PVA and the small processing window,PVA-based composite materials were prepared by melt blending and plasticizing for improvement of thermal stability.The water solubility and thermal properties of PVA-based composites were also assessed.Modified PVA-based materials have been greatly improved in 3D printing performances,which are expected to play a major role in improving the accuracy of 3D printing.