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首页> 外文期刊>Biomaterials >Effect of glass composition on the degradation properties and ion release characteristics of phosphate glass-polycaprolactone composites.
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Effect of glass composition on the degradation properties and ion release characteristics of phosphate glass-polycaprolactone composites.

机译：玻璃组成对磷酸盐玻璃-聚己内酯复合材料降解性能和离子释放特性的影响。

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摘要

A series of polycaprolactone and ternary-based (Na(2)O)(0.55-)(x)(CaO)(x)(P(2)O(5))(0.45) glass composites were created, each containing 20% volume percentage of glass with various calcium compositions. A short-term degradation study was carried out to investigate the physical and ion release behaviour of these composites, utilising analytical techniques such as dynamical mechanical analysis, and ion chromatography. All the composites experienced significant loss of weight and stiffness throughout the study, with the 24mol% calcium composites losing the greatest amount of weight and stiffness. The pH profile of the aqueous solutions in which the composites were placed were initially acidic, but began to neutralise mid-way through the study, with the 36mol% solution achieving the most acidic conditions. The ion release behaviour mirrored the mass loss behaviour of the glass component of the composites. The cations (sodium and calcium ions) release was comparable with the initial stages of composite massdegradation, both of which exhibited almost immediate release when placed into solution. The 24mol% composites underwent rapid rates of cation release, while the 36mol% experienced the slowest rates of release. By contrast, anion (phosphates and polyphosphates) release showed a dissimilar trend, with rapid release of the P(2)O(7) and P(3)O(10) occurring during the first few hours in solution, whilst the P(3)O(9) structure released steadily during the first 48h in solution. Finally, PO(4) release was at a constant rate over the duration of the study, releasing up to 300ppm from the 32 and 36mol% samples by the end of 200h. To summarise, these results show that by combining phosphate glasses with biodegradable polymer, it is possible to create composites whose rate of degradation can be controlled to meet the needs of their end application.
机译：创建了一系列的聚己内酯和基于三元（Na（2）O）（0.55-）（x）（CaO）（x）（P（2）O（5））（0.45）的玻璃复合材料，每个复合材料含20％具有各种钙成分的玻璃的体积百分比。利用动态力学分析和离子色谱等分析技术，进行了短期降解研究，以研究这些复合材料的物理和离子释放行为。在整个研究过程中，所有复合材料均经历了重量和刚度的显着降低，其中24mol％的钙复合材料损失了最大的重量和刚度。放置复合材料的水溶液的pH值最初是酸性的，但在研究过程中途开始中和，其中36mol％的溶液达到了最酸性的条件。离子释放行为反映了复合材料玻璃成分的质量损失行为。阳离子（钠离子和钙离子）的释放与复合材料质量降解的初始阶段相当，当置于溶液中时，这两个阶段几乎都立即释放。 24摩尔％的复合材料的阳离子释放速率很快，而36摩尔％的复合材料的释放速率最慢。相比之下，阴离子（磷酸盐和多磷酸盐）的释放显示出不同的趋势，P（2）O（7）和P（3）O（10）的快速释放发生在溶液的最初几个小时内，而P（2 3）O（9）结构在溶液中的前48小时内稳定释放。最后，在研究期间，PO（4）的释放速率恒定，到200h结束时从32和36mol％的样品中释放出300ppm。总而言之，这些结果表明，通过将磷酸盐玻璃与可生物降解的聚合物结合使用，可以生产出降解率可以控制以满足其最终应用需求的复合材料。

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