Development of new acid-imide modified Mg-Al/LDH reinforced semi-crystalline poly(amide-imide) containing naphthalene ring; study on thermal stability and optical properties

New poly(amide-imide) Mg-Al/layered double hydroxide (LDH) nanocomposites (PAINC) were prepared by solution intercalation technique from new semi crystalline poly(amide-imide) (PAI) containing naphthalene with new diacid-diimide modified Mg-Al LDH (DLDH) and sodium dodecylbenzene sulfonate (SDBS) modified Mg-Al LDH (SLDH). The X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) results showed a uniform distribution for LDH sheets with in the PAI matrix. Thermal properties of all the samples were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The thermal properties results in both nitrogen and air atmospheres showed that the addition of DLDH resulted substantial increase in the thermal stability and char yields of PAINC and indicated that DLDH had the better effect than the SLDH in thermal properties of PAI. The UV–Vis spectra of all PAINC showed reduction in intensities with increase LDH content.