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Enzymatic Degradation of Acrylic Acid-Grafted Poly(butylene succinate-co-terephthalate) Nanocomposites Fabricated Using Heat Pressing and Freeze-Drying Techniques

Department of Materials Science and Engineering, National Chung Hsing University, 250 KuoKuang Road, Taichung 402, Taiwan
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Materials 2020, 13(2), 376; https://doi.org/10.3390/ma13020376
Received: 15 December 2019 / Revised: 6 January 2020 / Accepted: 10 January 2020 / Published: 14 January 2020
Biodegradable acrylic acid-grafted poly(butylene succinate-co-terephthalate) (g-PBST)/organically modified layered zinc phenylphosphonate (m-PPZn) nanocomposites were effectively fabricated containing covalent bonds between the g-PBST and m-PPZn. The results of wide-angle X-ray diffraction and transmission electron microscopy revealed that the morphology of the g-PBST/m-PPZn nanocomposites contained a mixture of partially exfoliated or intercalated conformations. The isothermal crystallization behavior of the nanocomposites showed that the half-time for crystallization of 5 wt % g-PBST/m-PPZn nanocomposites was less than 1 wt % g-PBST/m-PPZn nanocomposites. This finding reveals that increasing the loading of m-PPZn can increase the crystallization rate of nanocomposites. Degradation tests of g-PBST/m-PPZn nanocomposites fabricated using the heat pressing and the freeze-drying process were performed by lipase from Pseudomonas sp. The degradation rates of g-PBST-50/m-PPZn nanocomposites were significantly lower than those of g-PBST-70/m-PPZn nanocomposites. The g-PBST-50 degraded more slowly due to the higher quantity of aromatic group and increased stiffness of the polymer backbone. The degradation rate of the freeze-drying specimens contained a more extremely porous conformation compared to those fabricated using the heat pressing process. View Full-Text
Keywords: biodegradable; composites; crystallization behavior; degradation; heat pressing technique; freeze-drying technique biodegradable; composites; crystallization behavior; degradation; heat pressing technique; freeze-drying technique
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MDPI and ACS Style

Lin, S.-H.; Wang, H.-T.; Wang, J.-M.; Wu, T.-M. Enzymatic Degradation of Acrylic Acid-Grafted Poly(butylene succinate-co-terephthalate) Nanocomposites Fabricated Using Heat Pressing and Freeze-Drying Techniques. Materials 2020, 13, 376.

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