Molecular mobility and physical ageing of plasticized poly(lactide) |
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| Authors: | Larisa Dobircau Nicolas Delpouve Romuald Herbinet Sandra Domenek Loïc Le Pluart Laurent Delbreilh Violette Ducruet Eric Dargent |
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| Affiliation: | 1. AMME‐LECAP EA4528 International Laboratory, Institut des Matériaux de Rouen, Université et INSA de Rouen, France;2. Laboratoire de Chimie Moléculaire Thio‐organique (LCMT), UMR 6507, INC3M, FR3038, Ensicaen & Université de Caen, Caen, France;3. AgroParisTech, UMR1145 Ingénierie Procédés Aliments, Massy, France;4. INRA, UMR1145 Ingénierie Procédés Aliments, Massy, France |
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| Abstract: | Molecular mobility and physical ageing of amorphous plasticized polylactide (PLA) with two different contents of mesolactide are studied with the help of thermal analysis. Used plasticizers are acetyl tributyl citrate (ATBC) and triacetin (TA), two molecules with established miscibility and plasticizing efficiency. Lower plasticizer permanence of TA compared with ATBC is found. The plasticizer molecules decreased the size of the cooperativity domains at the glass transition temperature Tg and likely in the glassy state by decreasing intermacromolecular interactions and notwithstanding the mesolactide content of PLA and the chemical identity of the plasticizer. The recovery function is given and shows a significant effect of the plasticizer on the physical ageing. The supplementary free volume brought by the plasticizer enhances molecular mobility in the glassy state and increases structural relaxation at one order of magnitude. The comparison between different plasticizers reveals that the structural relaxation is however independent from the type of plasticizer and the percentage of mesolactide in PLA. POLYM. ENG. SCI., 55:858–865, 2015. © 2014 Society of Plastics Engineers |
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