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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Crystallization processes at the surface of polylactlc acid-bioactive glass composites during immersion in simulated body fluid
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Crystallization processes at the surface of polylactlc acid-bioactive glass composites during immersion in simulated body fluid

机译：浸入模拟体液期间聚乳酸-生物活性玻璃复合材料表面的结晶过程

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摘要

We report on the crystallization processes occurring at the surface of PDLLA-Bioglass~R composites immersed in simulated body fluid. Composites manufactured by injection molding and containing different amounts (0, 20, 30, and 50 wt %) of 45S5 Bioglass~R particles were tested for durations up to 56 days and compared with Bioglass~R particles alone. Crystallization processes were followed by visual inspection, X-ray diffraction (with Rietveld analysis) and scanning electron microscopy. Both calcite and hydroxyapatite were formed at the surface of all materials, but their relative ratio was dependent on the Bioglass~R content and immersion time. Hydroxyapatite was always the major phase after sufficient immersion time, insuring bioactivity of such composites especially for Bioglass~R content higher than 30 wt %. A scenario of crystallization is proposed. Rapid degradation of the composites with 50 wt % was also observed during immersion. Therefore, composites with 30 wt % of Biogiass~R particles seem to exhibit the best balance between bioactivity and stability at least during the first weeks of immersion in contact with body fluids.
机译：我们报告了浸入模拟体液的PDLLA-Bioglass〜R复合材料表面发生的结晶过程。测试了通过注射成型制造且包含不同量（0、20、30和50 wt％）的45S5Bioglass®R颗粒的复合材料的长达56天的持续时间，并将其与单独的Bioglass®R颗粒进行了比较。结晶过程之后进行目测，X射线衍射（采用Rietveld分析）和扫描电子显微镜。在所有材料的表面都形成了方解石和羟基磷灰石，但它们的相对比例取决于Bioglass〜R含量和浸泡时间。经过足够的浸没时间后，羟基磷灰石始终是主要相，从而确保了此类复合材料的生物活性，尤其是对于Bioglass〜R含量高于30 wt％的情况。提出了结晶的方案。在浸渍过程中还观察到复合材料具有50 wt％的快速降解。因此，至少在与体液接触的最初几周内，具有30 wt％Biogiass〜R颗粒的复合材料似乎在生物活性和稳定性之间表现出最佳的平衡。

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