PVA/n-HA composites suiting for microinjection molding were prepared based on Solid State Shear Milling (S3 M) and molecular complexation technologies

And the microinjection molding of PVA/n-HA composites with n-HA content of 30% were realized. The thermal properties

rheological properties of PVA/n-HA composites were characterized by differential scanning calorimetry (DSC)

thermogravimetric analysis (TGA) and high pressure capillary rheometer. The results showed that the melt point of modified PVA/n-HA composites decreased and the thermal decomposition temperature increased

obtaining the thermal processing window of more than 120℃. PVA/n-HA composites showed shear-thinning behavior and the low melt viscosity at high shear rate was suitable for microinjection molding. So PVA/n-HA composites had good mold filling performance. The structure and properties of PVA/n-HA microinjection molded samples were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that n-HA was well dispersed in PVA matrix and increased the dimension stability of the injection samples. Due to the effect of high shear force inducing crystallization of PVA in microinjection molding

the crystallinity of PVA/n-HA microinjection molded sample was higher than that of conventional injection molded sample.