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- W2480364553 abstract "The melt degradation of poly(L-lactide) was studied at 180 °C using a melt rheometer for monitoring changes in the melt viscosity. Further studies of the degraded PLLA were made using SEC, 1H-NMR and DSC. The thermal degradation was found to proceed in a random main-chain scission procedure. The mechanisms include depolymerization reactions and oxidative degradation in the presence of oxygen. However, hydrolysis as well as inter- and intramolecular reactions could not be excluded. Peroxide addition was found to stabilize the polymer against thermal degradation. The modified material was analyzed using SEC, XPS, DSC, TGA and by microscopic studies. Hydroperoxides, peroxy acid, peroxy ester, dialkanoyl peroxide, diaroyl peroxide and dialkyl peroxydicarbonate stabilized the melt during mixing. Non-stabilizing peroxides were dialkyl and diaralkyl peroxide. The stabilization mechanism was deactivation of the species that catalyze the reversible esterification reaction. The melt temperature of the peroxide modified polymer and the crystallinity decreased." @default.
- W2480364553 created "2016-08-23" @default.
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- W2480364553 date "1996-05-05" @default.
- W2480364553 modified "2023-10-11" @default.
- W2480364553 title "Chemical and Morphological Changes in Peroxide-Stabilized Poly(<scp>L</scp>-lactide)" @default.
- W2480364553 doi "https://doi.org/10.1021/bk-1996-0627.ch009" @default.
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