| Summary: | 碩士 === 國立中興大學 === 材料科學與工程學系所 === 107 === Poly(butylene adipate-co-terephthalate) (PBAT) is an environmentally friendly biodegradable polymer which contains the comparative physical properties to that of low-density polyethylene. In this study, PBAT was synthesized from different molar ratios of adipic acid and dimethyl terephthalate. Then, the maleic acid was grafted onto PBAT polymer chain (g-PBAT) and the organically modified PPZn was sucessfully synthesized to intercalate diaminohexane and dodecanediamine into the interlayer spacing of PPZn (designated as C6-PPZn and C12-PPZn) to improve the compatibility and dispersibility between the polymer and PPZn. Furthermore, the dispersion, crystallization and biodegradability of g-PBAT/organically modified PPZn nanocomposites were investigated systemtically.
The interlayer spacing of PPZn determined by wide-angle X-ray diffraction (WAXD) was increased from 14.6 Å for PPZn to 24.1 Å and 16 Å for C6-PPZn and C12-PPZn, respectively. Compared to the PPZn, the FT-IR spectra of organically modified PPZn contain absorption bands at 2853-3005 cm-1 and 1650-1550 cm-1 for the C-H stretching vibration and NH2 deformation from diaminohexane and dodecanediamine. The g-PBAT/ organically modified PPZn nanocomposites were prepared by solvent intercalation method. The structure and morphology of the g-PBAT/ organically modified PPZn nanocomposites were characterized by WAXD and transmission electron microscopy (TEM). The results of WAXD and TEM results show that the organically modified PPZn are randomly dispersed in the PBAT matrix. However, the addition of organically modified PPZn into PBAT would not change the crystalline structure of the nanocomposites. The results of isothermal crystallization show that the crystallization rate increases when the incorporation of C6-PPZn in nanocomposites increases, in contrast to C12-PPZn. Degradation tests was used Lipase from Pseudomonas sp. as the enzymatic degradation solution. Both the increasing content of organically modified PPZn and the presence of grafted maleic acid into PBAT would increase the weight loss of PBAT. In addition, the degradation rate of the porous morphology is more significant than the film morphology.
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