聚氨酯—硫酸軟骨素膜的制備及其抗結(jié)殼性能研究
[Abstract]:Rigid crusts and induced infections are the fundamental factors affecting the clinical efficacy and life span of ureteral stents. The rapid formation of conditional membrane after stent implantation is one of the key factors for the formation of crusts. Polyurethane (PU) is one of the common materials for ureteral stents. It has good biocompatibility and excellent physical and mechanical properties, and its inherent hydrophobic properties are conducive to protein adsorption and bacterial adhesion growth. This leads to scaffold crusts and inflammatory problems. The surface modification of polyurethane is one of the good strategies to solve the problems of the scaffold. In this paper, commercial PU Pellethane 2363-80AE was used as substrate to introduce chondroitin sulfate with hydrophilic and negative charge onto polyurethane surface by chemical grafting. The polyurethane-chondroitin sulfate (PU-CS) membrane with different surface properties was obtained by adding different spacers and spacer inputs. The adsorption of protein, mucopolysaccharide and other biomolecules by special surface structure and physicochemical properties, and the effect of the formation of conditioned film on inorganic salt deposition, bacterial adhesion and growth were studied. The results showed that the modified PU-CS film was more hydrophilic and had a good protein inhibition effect. PU-CS (3), which was the spacer group of propylenediamine and the grafted CS, had the best resistance to protein adsorption. The formation of membrane on the surface of modified membrane was inhibited, and the adsorption of protein and mucopolysaccharide was decreased. The protein in the conditioned film could promote the deposition of inorganic salt, while mucopolysaccharide could reduce the deposition of inorganic salt by reducing the particle size of inorganic salt, and on the 7th day, the deposition of inorganic salt on PU-CS (3) membrane was the least. The CS modified PU membrane showed less bacterial adhesion. The decrease of protein and the increase of mucopolysaccharide content in the conditioned membrane would help to reduce the bacterial adhesion, and the bacterial adhesion on PU-CS (3) membrane was the least. The results can provide experimental basis for surface modification of scaffolds and design surfaces with anti-protein adhesion and favorable mucopolysaccharide adhesion, which may improve the anti-crusting performance of scaffolds.
【學(xué)位授予單位】:華東理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:R318.08
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