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A technique for improving dispersion within polymer–glass composites using polymer precipitation
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2021-08-20 , DOI: 10.1016/j.jmbbm.2021.104767
Reece N Oosterbeek 1 , Xiang C Zhang 2 , Serena M Best 1 , Ruth E Cameron 1
Affiliation  

Particulate reinforcement of polymeric matrices is a powerful technique for tailoring the mechanical and degradation properties of bioresorbable implant materials. Dispersion of inorganic particles is critical to achieving optimal properties, however established techniques such as twin-screw extrusion or solvent casting can have significant drawbacks including excessive thermal degradation or particle agglomeration. We present a facile method for production of polymer–inorganic composites that reduces the time at elevated temperature and the time available for particle agglomeration. Glass slurry was added to a dissolved PLLA solution, and ethanol was added to precipitate polymer onto the glass particles. Characterisation of parts formed by subsequent micro-injection moulding of composite precipitate revealed a significant reduction in agglomeration, with d0.9 reduced from 170 to 43 μm. This drastically improved the ductility (ɛB) from 7% to 120%, without loss of strength or stiffness. The method is versatile and applicable to a wide range of polymer and filler materials.



中文翻译:

一种使用聚合物沉淀改善聚合物-玻璃复合材料内分散的技术

聚合物基质的颗粒增强是一种强大的技术,用于定制生物可吸收植入材料的机械和降解特性。无机颗粒的分散对于实现最佳性能至关重要,但是,双螺杆挤出或溶剂浇铸等成熟技术可能具有明显的缺点,包括过度热降解或颗粒团聚。我们提出了一种生产聚合物-无机复合材料的简便方法,可以减少高温时间和颗粒团聚的可用时间。将玻璃浆加入溶解的 PLLA 溶液中,并加入乙醇以将聚合物沉淀到玻璃颗粒上。d0.9 从 170 减少到 43 μ米。这大大提高了延展性(ɛ) 从 7% 到 120%,而不会损失强度或刚度。该方法用途广泛,适用于多种聚合物和填料材料。

更新日期:2021-08-26
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