PREPARATION AND CHARACTERIZATION OF ORGANICALLY MODIFIED LAYERED ZINC PHENYLPHOSPHONATE/POLY(1,4-BUTYLENE CARBONATE-CO-TEREPHTHALATE)S NANOCOMPOSITES

摘要

In this work, the biocompatible organic dodecylamine and octadecylamine were selected to modify layered zinc phenylphosphonates (PPZns) (designated as C_(12)-PPZn and C_(18)-PPZn). C_(12)-PPZn and C_(18)-PPZn were added into the Poly(butylene carbonate-co-terephthalate) (PBCT) polymer matrix as nucleating agents. The fourier-transform infrared spectroscopy (FT-IR) spectra of C_(12)-PPZn and C_(18)-PPZn contain additional absorption peaks at 3300 cm~(-1) and 1370-1000 cm~(-1), which are attributed to dodecylamine and octadecylamine in corporation into PPZn. The results of wide angle x-ray diffraction (WAXD) and transmission electron microscope (TEM) demonstrate that PPZn layers were intercalated by PBCT polymer chains. The crystallization properties of nanocomposites were analyzed by differential scanning calorimetry (DSC). Experimental results of non-isothermal and isothermal melt crystallization kinetics showed that PPZn had a significant impact on crystallization behavior of PBCT. With the presence of organic modified-PPZn, the T_c of PBCT increase significantly. Upon the addition of 5% C_(12)-PPZn, the crystallization half-times at 125°C of the PBCT/C_(12)-PPZn composite decrease from 7.68 min of pure PBCT to 2.09 min of 5 wt% nanocomposite.