Preparation And Properties Of Functional Composite Materials For Three-dimensional Printing

Due to the advantages of rapid prototyping technology and personalized customization,3D printing is becoming a promising technology for the personalized manufacturing in biomedical industry or precision machining.With the development of 3D printing technology and the growing demand of personalized medical services,3D printing technology has drawn great attention of researchers.On one hand,3D printing is an emerging technology to produce personalized treatment in clinical such as bone defects.On the other hand,3D printing can also enter daily life by producing common devices for people.In the process of 3D printing,the performances of the products are mainly determined by the raw materials.Therefore,the study of 3D printing materials is highly significant.Based on the excellent performance of organic/inorganic composites,a series of composite materials were prepared.The main contents of this dissertation are as follows:1?A series of high-performance 3D printing ABS composite materials possessing with multifunction were prepared.By the advantage of surface modification in improving interface compatibility between organic and inorganic materials,this study enhanced the interface compatibility between ABS and SiO2 by surface modification on inorganic materials,and the compatibility between ABS and short carbon fibers were increased by macromolecular modification.Moreover,a new kind of ABS composite materials containing nano-silver were developed,which provided a promising strategy to fabricate biomedical devices for daily use.2?A novel 3D printing PLLA scaffold used for bone defect treatment was fabricated.Firstly,hydroxyapatite(HA)nanoparticles were modified by a straightforward and economical method to improve the compatibility with the matrix.Briefly,HA nanoparticles were modified with dopamine and hexamethylenediamine,and PLLA chains were grafted onto the HA nanoparticles by aminolysis reaction.Then,the PLLA-modified HA nanoparticles were blended with PLLA to form a thermoplastic composite for 3D printing.Due to the high compatibility between the PLLA matrix and PLLA-modified HA nanoparticles,the 3D-printed PLLA/HA scaffolds possess robust mechanical properties and good biocompatibility.This study provides a flexible strategy to fabricate scaffolds for the customized treatment of bone defects.