壳聚糖接枝改性PET 人工韧带的表面结构与特性研究

目的:于聚对苯二甲酸乙二醇酯(PET)人工韧带材料表面接枝壳聚糖长链分子,对改性PET人工韧带的表面结构与特性进行分析,以期为较好生物相容性的PET人工韧带材料的设计和研发奠定一定的理论基础和技术支持。方法:首先采用化学接枝法在聚对苯二甲酸乙二醇酯(PET)织物表面接枝丙烯酸(PET-AAc),再与壳聚糖分子发生酰胺化反应实现PET表面的壳聚糖接枝(PET-CHI)。借助接触角、x射线光电子能谱(XPS)、傅立叶红外光谱(FTIR)、热失重(TG)和扫描电镜(SEM)等对PET改性效果进行分析表征。结果:壳聚糖长链分子成功接枝到PET表面,壳聚糖在PET表面的接枝厚度为2.25μm,接枝量为9.66 wt%。结论:接枝改性后PET表面亲水性有较大提高,浸润性得到改善。

Structure and Properties of PET Fabric Modifiedby Chitosan Surface Grafting

Objective: To improve the hydrophilicity of PET fabric texture in order to increase its histocompatibility.Evaluate the effects of surface modified PET fabric texture.Methods: Acrylic acid was grafted on the surface of polyethylene terephthalate fabric(PET-AAc) by chemical grafting method firstly,then chitosan could be grafted on the PET surface(PET-CHI) successfully by the amidization reaction between PET-AAC and chitosan.The modification effect of PET was analyzed and characterized by contact angles,X-ray photoelectron spectroscopy(XPS),Fourier transformed infrared spectroscopy(FTIR),Thermal-gravimetric analyzer(TGA) and Scanning electric microscope(SEM).Results: Chitosan long-chain molecule was successfully grafted on the surface of PET,the grafting thickness and grafting mass fraction of chitosan was 2.25μ m and 9.66wt%,respectively.Conclusions: The hydrophilicity was highly increased and wetting property was also improved by grafting macromolecule acute radicals.Effect was restricted to the surface,mechanical property remained well.