摘要
系统研究了含有聚乳酸-聚乙二醇-聚乳酸嵌段共聚物(PLA-PEG-PLA)的聚乳酸组织工程支架在模拟体液(SBF)中的降解和生物矿化性能。通过研究可以得到如下结论:随着含有PLA-PEG-PLA共聚物的聚乳酸组织工程支架在模拟体液中浸泡时间的增长,模拟体液的pH值有下降趋势;支架材料的质量有升有降,是降解和矿化作用共同影响的结果。X射线衍射图谱和FT-IR漫反射图谱研究表明,浸在SBF中的支架表面有磷灰石沉积物出现,并且PLA-PEG-PLA共聚物降解速度比PLA快。
Degradable performance and bio-mineralization function of polylactic acid(PLA)-polyethylene glycol(PEG)-PLA/PLA tissue engineering scaffolds in simulated body fluid(SBF) were systematically studied by pH value of SBF,the lost weight ratio of scaffolds,scanning electron microscope(SEM),X-ray diffraction(XRD) and Fourier transform infrared spectrum(FT-IR) of scaffolds' surface.We found that pH value of SBF decreases with the soaking time of PLA-PEG-PLA/PLA tissue engineering scaffolds in SBF decreasing.However,the weight of scaffolds does not always decrease with the time and it is influenced by the process of degradation and by the process of bio-mineralization.The results of XRD and FT-IR measurement show that there appeares the deposition of apatite on the surface of scaffolds and the degradation rate of PLA-PEG-PLA is quicker than that of PLA in SBF.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2011年第11期126-128,132,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51072055)
国家自然科学基金重点项目(50830101)
国家重点基础研究发展计划(973计划)(2011CB606204)