生物降解PPC/HA复合材料的制备与性能研究

Preparation and Properties of Biodegradable PPC/HA Composites

将羟基磷灰石(HA)用硅烷偶联剂KH570处理,然后与聚碳酸亚丙酯(PPC)进行共混,制备了一种可生物降解、生物相容性好的PPC/HA复合材料,研究了其在不同混合比例时的力学性能、玻璃化转变温度及其内部结构。该复合材料力学强度介于塑料和橡胶之间,具备良好的力学回复特性和一定的形状记忆效应,HA为20％(质量分数,下同)时,断裂伸长率达到315％,弹性回复率可达98％。DSC分析表明,复合材料的玻璃化转变温度受HA的影响不大,在35℃左右,随HA含量的不同略微有一些变化。SEM观察到在拉伸过程中,复合材料内部出现一种板块与微纤复合结构,这种结构对材料的力学性能变化有一定影响,可能也是力学回复特性产生的原因。

A novel bio-degradable, biocompatible composite was prepared by introducing surface-coated hydroxyapatite particles into poly（propylene carbonate）. Mechanical properties, glass transition temperature, and microstructures of PPC/HA composite with different mass proportions were studied. The composite exhibits mechanical behaviors between those of plastics and rubber, and shows obvious elastic recovery and shape memory. While the content of HA was 20 wt %, the elongation at break reached 315 %, and recovery rate was 98 %. DSC showed the glass transition temperature of the composite was about 35℃, little affected by the existence of HA particles. SEM reveals a bulk-microfibril structure in the composite, which may be responsible for the mechanical performances, especially the elastic recovery.