Structure and properties of nano hydrotalcite/nylon 6 composites prepared by reactive extrusion

With the main raw meterials of self-made double methoxybenzoic acid anion pillared hydrotalcite (MgAl-HTlcs) and caprolactam(CL), nano MgAl-HTlcs/nylon 6 composites were prepared by reactive extrusion, and the effect of MgAl-HTlcs content on microstructure and properties of the composites were investigated. TEM photographs show that MgAl-HTlcs disperse uniformly in composites as nanoscale and there are part exfoliated hydrotalcite in composite with MgAl-HTlcs of 1.0wt%(mass fraction of MgAl-HTlcs, CL total quality). UV-Vis spectra show that, compared with pure nylon 6, the MgAl-HTlcs/nylon 6 composites can strongly absorb the ultraviolet rays whose wavelength is between 320-380 nm. XRD and DSC results show that a small amount of MgAl-HTlcs plays a good role in heterogeneous nucleation of nylon 6, and improves its crystallization temperature and crystallinity. Thermogravimetric analysis shows the exists of part exfoliated MgAl-HTlcs, which improves the thermal stability of composites obviously.