Poly (lactide-co-glycolide)-based nanocomposite reinforced by a novel hybrid nanohydroxyapatite

To obtain a high-performance poly(lactide-co-glycolide) (PLGA)-based composite, a novel functionalized hybrid nanohyoxyapatite (n-HA) was proposed by introducing carboxymethyl-β-cyclodextrin (CMCD) and zoledronic acid (ZA). IR, XRD, TGA, dispersion experiments for hybrid n-HA and universal testing machine, SEM, DSC, POM for the hybrid n-HA/PLGA composite were carried out. The results showed that initial adjusted pH = 11 was more favor for the grafting rate of CMCD, and ZA was preferentially grafted on n-HA surface due to stronger binding ability to Ca²⁺. The high content of CMCD and ZA of 40%CMCD-10%ZA-n-HA could be well dispersed in organic solvents, which could effectively promote crystallization, so that CMCD-ZA-n-HA displayed the best reinforce effect for PLGA, whose tensile strength and elongation at break were 16.20 and 41.99% higher than PLGA, respectively. In vitro soaking in simulated body fluid (SBF) and cell proliferation results demonstrated that CMCD-ZA-n-HA endowed PLGA with faster degradation, better bone-like apatite deposition and cells adhesion and proliferation ability. The study would provide a new simply method to obtain a functionalized hybrid n-HA, which had a great potential to obtain ideal n-HA/PLGA composite used in the bone materials field.