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標題: Effect of layered double hydroxides on the thermal degradation behavior of biodegradable poly(L-lactide) nanocomposites
作者: Chiang, Ming-Feng
Chu, Mei-Zhen
Wu, Tzong-Ming
關鍵字: Poly(l-lactide);Layered double hydroxide;Nanocomposite;Thermal degradation;Unzipping depolymerization reaction
出版社: Elsevier Ltd.
Project: Polymer Degradation and Stability, Volume 96, Issue 1, Page(s) 60-66.
This study elucidates the thermal degradation behavior of biodegradable poly(l-lactide) (PLLA)/layered double hydroxide (LDH) nanocomposites was explored using thermogravimetric analysis (TGA) and pyrolysis-gas chromatography/mass spectroscopy (Py-GC/MS) in an inert atmosphere. PLLA/LDH nanocomposites were fabricated using PLLA and organically-modified magnesium/aluminum layered double hydroxide (P-LDH) in tetrahydrofuran solution. According to the TGA results, the thermal stability of PLLA/P-LDH nanocomposites was significantly lower than that of pure PLLA matrix, perhaps because P-LDH provides thermal acceleration of the degradation of the underlying polymer from the heat source. The identification of the thermal degradation products by Py-GC/MS evidently shows that introducing P-LDH into PLLA leads to a remarkable change during the thermal degradation process. The main reaction route of neat PLLA was through inter- and intra-transesterification to generate lactides and oligomer. The primary volatile products obtained from PLLA/P-LDH nanocomposites were lactides regardless of the temperature of degradation. These results suggest that the thermal degradation behavior of PLLA/P-LDH nanocomposites is governed by the preferential formation of lactide by the unzipping depolymerization reaction, which is catalyzed by Mg and Al components in P-LDH.
ISSN: 0141-3910
DOI: 10.1016/j.polymdegradstab.2010.11.002
Appears in Collections:材料科學與工程學系

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