Journal
POLYMER
Volume 47, Issue 13, Pages 4845-4850Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2006.05.002
Keywords
hydrolysis; degradation; polylactic acid
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Molecular modeling has been used to explain how the blending of poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) affects the resistance of poly(lactide) (PLA) to hydrolysis. Amorphous PLLA/PDLA blends were created using molecular modeling, and the minimum potential energy of the blends before and after hydrolysis were obtained. The 50/50 blend has the greatest resistance to hydrolysis. which agrees with past experiments and is due to its having stronger hydrogen-bonding and dipole-dipole interactions than pure PLLA or PDLA. This is based on the 50/50 blend having more of these interactions and shorter average lengths for the hydrogen-bonds and dipole-dipole interactions compared to pure PLLA and PDLA. Hydrogen-bonding possibly has a greater effect than the dipole-dipole interactions on the resistance to hydrolysis. The chance in potential energy for hydrolysis decreases linearly with increasing % PLLA or % PDLA from 0 to 50%. (c) 2006 Elsevier Ltd. All rights reserved.
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