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Fabrication and properties of degradable poly(amino acid)ano hydroxyapatite bioactive composite

机译:可降解聚氨基酸/纳米羟基磷灰石生物活性复合材料的制备与性能

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摘要

Poly(amino acid)ano hydroxyapatite (PAA-HA) bioactive composite was prepared by in situ melting polymerization. The composition, structure and morphology as well as glass transition temperature (T _g), dynamic mechanical properties of the PAA-HA composite were characterized by infrared spectrometer, X-ray diffractometer, X-ray photoelectron spectroscopy, scanning electron microscope, differential scanning calorimeter, and dynamic mechanical analyzer. The results indicated that the n-HA particles were uniformly distributed into PAA matrix and some interactions were found at the interface between PAA and n-HA, and the crystallinity of PAA in the composite decreased with the increase of n-HA content. The T _g and storage modulus of the composite increased with increasing n-HA content, demonstrating that the n-HA content had obvious effects on the crystallization kinetic parameters and thermo properties of the PAA-HA composite. In addition, the n-HA amount had evident effects on the degradation of the PAA-HA composite in phosphate buffered saline (PBS), and the weight loss ratio of the composite decreased with the increase with n-HA content. The pH value of the medium was stable around 7.40 after the composite immersion into PBS for 8 weeks.
机译:通过原位熔融聚合制备了聚氨基酸/纳米羟基磷灰石(PAA / n-HA)生物活性复合材料。用红外光谱仪,X射线衍射仪,X射线光电子能谱,扫描电子显微镜,差示法表征了PAA / n-HA复合材料的组成,结构,形貌以及玻璃化转变温度(T _g),动态力学性能。扫描量热仪和动态机械分析仪。结果表明,n-HA颗粒均匀分布在PAA基体中,并在PAA与n-HA的界面处发生了一些相互作用,复合物中PAA的结晶度随n-HA含量的增加而降低。随着n-HA含量的增加,复合材料的T_g和储能模量增加,表明n-HA含量对PAA / n-HA复合材料的结晶动力学参数和热性能有明显影响。另外,n-HA的量对磷酸盐缓冲盐水(PBS)中PAA / n-HA复合材料的降解有明显的影响,复合材料的失重率随n-HA含量的增加而降低。复合材料浸入PBS中8周后,培养基的pH值稳定在7.40左右。

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