羟基磷灰石含量对纳米粒子-聚己内酯复合材料性能的影响

水热法合成纳米羟基磷灰石(HA)并将其分散在己内酯中,以其羟基为引发剂,在催化剂的作用下,引发己内酯开环聚合,制备纳米粒子-聚合物复合材料.NMR、DSC、XRD、PLM以及力学性能试验,探讨纳米粒子含量对复合材料的性能影响.随着纳米粒子含量的增加,聚己内酯(PCL)聚合度逐渐降低,在较高HA含量时,仍然存在较多的纳米粒子团聚;复合材料中PCL的结晶度基本不随纳米HA含量的变化而变化;HA含量为5wt%时,复合材料的断裂延伸率、抗拉强度以及压缩模量达到最大值;HA含量低于20wt%时,复合材料的弹性模量随着纳米粒子含量的增大而增加.

Effect of the HA content on the properties of nanoparticle-polycaprolactone composites

Hydroxyapatite nanoparticles(HA) were synthesized by hydrothermal method.HA was dispersed in caprolactone and induced the ring-opening polymerization to prepare the nanoparticle-polymer composites.The effect of the HA content on the properties of the composites was discussed by NMR,DSC,XRD,PLM and mechanical measurements.Polymeric degree of PCL decreased with the increasing of HA content in composites and the agglomerate of the nano-particles existed in composites when the HA content was higher.As the HA was 5wt% in the raw materials,the strain at failure,tensile strength and compressive modulus arrived the highest value.When the content of HA was under 20wt%,the elastic modulus of the composites increased with the increasing of HA content.