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首页> 外文期刊>Key Engineering Materials >Improvement of the Mechanical Properties of Calcium Phosphate Bone Substitutes by Polycaprolactone Infiltration
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Improvement of the Mechanical Properties of Calcium Phosphate Bone Substitutes by Polycaprolactone Infiltration

机译：聚己内酯渗透改善磷酸钙骨替代物的力学性能

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摘要

In this study we show that mechanical properties of bioceramic scaffolds can be significantly improved by repeated infiltration with a low-viscosity polycaprolactone solution. Biphasic calcium phosphate (BCP: 70% hydroxyapatite, 30% β-tricalcium phosphate) scaffolds characterized by a bimodal pore size distribution and a global porosity of 70% have been chosen as starting materials. Polymer content in the ceramic scaffold was varied so that an inorganic/organic ratio close to that of bone may be achieved. Work of fracture at maximum stress was 36 J/m~2 for the ceramic scaffold alone and reached 127 J/m~2 for the 8-times infiltrated samples. These results are superior to the ones previously obtained with polycaprolactone infiltrated alumina due to higher micropore content. We show that during bending tests, polycaprolactone phase formed fibrils while the crack propagated. Crack bridging by polycaprolactone ensured the integrity of the composite once the ceramic scaffold was broken and directly involved in the composite toughening. Because of its composition, microstructure and mechanical behavior of this kind composite can be an interesting candidate for bone substitution.
机译：在这项研究中，我们表明，通过用低粘度的聚己内酯溶液反复渗透，可以大大改善生物陶瓷支架的机械性能。已选择以双峰孔径分布和整体孔隙率为70％为特征的双相磷酸钙（BCP：70％羟基磷灰石，30％β-磷酸三钙）支架。改变陶瓷支架中的聚合物含量，使得可以实现接近骨骼的无机/有机比。仅陶瓷支架在最大应力下的断裂功为36 J / m〜2，而8次渗透样品的断裂功达到127 J / m〜2。由于较高的微孔含量，这些结果优于先前用聚己内酯渗透的氧化铝获得的结果。我们表明，在弯曲测试过程中，聚己内酯相形成了原纤维，而裂纹也在扩展。一旦陶瓷支架破裂并直接参与复合材料的增韧，聚己内酯的裂缝桥接就确保了复合材料的完整性。由于其成分，这种复合材料的微观结构和机械性能可能是骨替代的有趣候选物。

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