改性HA/PLA纳米复合材料的制备及其性能

Synthesis and Characterization of Nanocomposites of PLA with Surface Modified Hydroxyapatite Nanoparticles

以Ca(OH)2和H3PO4为原料,采用冷冻干燥技术制备纳米羟基磷灰石(n-HA),并在其表面接枝聚乳酸(PLA),得到改性的纳米羟基磷灰石(g-HA),采用XRD及FTIR进行表征;借助超声分散用溶液共混法制备g-HA/PLA和n-HA/PLA纳米复合材料。并采用弯曲性能测试、DMA和POM对其力学性能和结晶性能进行表征。结果表明g-HA作为良好的相容剂和异相成核剂,对g-HA在PLA基质中分散性的提高和纳米复合材料界面粘结强度的提高起到了良好的作用,g-HA/PLA纳米复合材料的弯曲模量、玻璃化温度和储能模量均有显著的提高。所采用的制备方法简便易行,具有潜在的工业应用前景。

Hydroxyapatite nanocrystals （n-HA） were synthesized through the reaction of calcium hydroxidewith phosphoric acid followed by freeze drying. PLA chains were grafted onto the n-HA surface to acquire modified hydroxyapatite nanoparticles （g-HA）. The structure of the products were characterized using XRD and FTIR. The g-HA/PLA and n-HA/PLA composites were prepared by solution mixing via ultrasonic dispersion. The mechanical properties and crystallization properties were subsequently investigated by bending test, dynamic mechanical analysis （DMA） and POM. The results showed that as a good compatibilizer with PLA chain grafting, g-HA plays an important role in improving g-HA dispersion in PLA matrix and interracial adhesive strength, thereby remarkably raises the flexural modulus, glass transition temperature and storage modulus of the g-HA/PLA composites. This preparation method is simple and convenient, with potential industrial application.