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- W2038937323 abstract "The thermal degradation of poly(lactic acid) stereocomplex (scPLA) was investigated to clarify the pyrolysis mechanism. Three scPLA samples with different chain end structures were prepared, namely, as-polymerised scPLA-ap, precipitated-with-methanol scPLA-pr, and purified metal-free scPLA–H. From the analyses of thermal degradation kinetics and pyrolysates of the scPLA samples, typical degradation mechanisms of these scPLAs were proposed as follows. The pyrolysis of scPLA-ap proceeds through main unzipping depolymerisation caused by Sn–alkoxide chain ends with apparent Ea=80–100kJmol−1, showing zero-order weight loss behaviour. The pyrolysis of scPLA-pr also proceeds via a zero-order weight loss process consisting of main Sn-catalyzed selective lactide elimination with apparent Ea=100–120kJmol−1 caused by Sn–carboxylate chain ends. The pyrolysates from scPLA-ap and scPLA-pr were predominantly l,l-/d,d-lactides. In the case of scPLA–H, random degradation is a main process, producing a large amount of meso-lactide and cyclic oligomers. These degradation mechanisms were nearly the same as those of the corresponding PLLAs, except that the scPLA-ap pyrolysis started at higher temperature due to the higher melting point of scPLA." @default.
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- W2038937323 date "2004-11-01" @default.
- W2038937323 modified "2023-10-06" @default.
- W2038937323 title "Thermal degradation behaviour of poly(lactic acid) stereocomplex" @default.
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- W2038937323 doi "https://doi.org/10.1016/j.polymdegradstab.2004.03.001" @default.
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