3D打印雙響應(yīng)紫外光固化水凝膠及其形狀記憶功能的研究
[Abstract]:3D printing is a kind of technology which uses computer software to control the machine to stack the material layer by layer to construct the target model. When it is applied to biomedical fields, it is also called "bio-printing", that is, biological materials, living cells, growth factors and so on are stacked into tissues or organs layer by layer and made active by computer-aided technology. Using 3D bio-printing technology, we can quickly, efficiently and accurately manufacture different sizes of models and complex internal structures, and through mixed printing with drugs, active factors, cells and so on, we can functionalize the model and realize organ customization. The purpose of controlled drug release. However, at present, there are still many problems in 3D printing biomaterials, such as few kinds of optional materials, harsh printing conditions (high temperature, laser, etc.), poor molding effect, complex preparation of materials, and so on. In this paper, Pluronic F127 (PEO100-PPO65-PEO100) was chemically modified to possess the double response of temperature response and ultraviolet response, so that the hydrogel model with complex internal structure and controlled drug release could be printed quickly and efficiently. On this basis, Pluronic F127 was combined with sodium alginate. The model with shape memory function could be prepared by 3D printing. First, the synthesis of modified F127 with double response and its application in 3D printing. The chemical modification of Pluronic F127 (PEO100-PPO65-PEO100), which is temperature-sensitive, was carried out by using acryloyl chloride. Carbon and carbon double bonds were introduced into the long chain end group. The modified F 127 has the characteristics of light response. The printing concentration and printing temperature of modified F127 were determined by rotary rheometer, and the diameter of printing nozzle (0.25 mm), printing platform temperature) was further determined by using 3D biological printer (3D-Bioplotter). Printing parameters such as printing speed (30 mm/s), extrusion pressure (0.6 bar) and UV source of 365 nm can make the material be formed efficiently in 5 seconds. The results of SEM characterization experiment show that 3D printing is a stacking process of physical state layer by layer. The results of swelling test and elastic modulus test showed that the mechanical properties of the model increased with the increase of printing ink concentration. The drug release experiment showed that the drug release behavior of the 3D printing model was similar to that of the traditional preparation method but the slow release effect was better. The cytotoxicity test showed that high concentration of modified F127 (0.20 g/mL) had good biocompatibility and could meet the requirement of 3D printing without post-treatment. Preparation of shape memory hydrogel with modified F127 and sodium alginate as one of the most widely used materials in 3D printing, sodium alginate is biodegradable. Non-toxic and can be gelatinized under the action of calcium ion. Because the modified F127 can form a network structure with certain mechanical properties, the shape memory function can be realized by the exchange of calcium ion and carbonate ion by mixed printing with sodium alginate. Using 3D-Bioplotter to explore the best formula of printing ink from the aspects of printing process fluency, printing accuracy, shaping effect, shape memory effect (fixed rate, recovery rate), etc. The experimental results show that the printing ink composed of modified F127 solution of 0.16g/mL and sodium alginate solution of 0.04 g/mL can achieve the ideal printing effect, in which the nozzle diameter is 0.25 mm, and the heating temperature is 35? The temperature of the platform is 40,45C, and the extrusion pressure is 0.8 bar,. The printing speed is 30 mm/s.. The printing model can realize the transformation of the temporary shape and the original shape under the action of the CaCl2 solution of 0.01 g/mL and the Na2CO3 solution of 0.02 g/mL.
【學(xué)位授予單位】:暨南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R318.08;TP391.73
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