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• W1964870838 abstract "Chemiorheology, i.e. rheological changes during the polymerization, of a biosourced monomer, i.e. l-Lactide, containing fumed silica have been studied. For that purpose, the reaction was proceeded in situ between the plates of a dynamic rheometer. The polymerization kinetics was followed from the variation of the complex shear modulus versus reaction time. Moreover, at temperatures lower than the crystallization temperature, it was possible to follow the crystallization process while the polymerization takes place. Adding fumed silica particles into the monomer leads to the formation of a physical (percolated) network from particle–particle interactions, i.e. silica, in the l-Lactide probably hydrophilic interactions. The gel-like structure was kept while the polymerization as long as the strain remains low indicating that the silica particle network remains weak. Furthermore, the mechanism of the break down of the gel structure under large deformation as well as the recovery was discussed. It seems that the non-linearity effect of the nanocomposites stems in the silica inter-particle interactions. It was found that silica particles do not have any effect on the temperature of crystallization – molar mass relation but could act as nucleating agent. In situ polymerization of l-Lactide in the presence of 5 wt.% of modified fumed silica was carried out in a reactor. It was found that fumed hydrophilic silica leaded to a microcomposite with highly dense agglomerates in the polymer matrix whereas with a less hydrophilic silica it was possible to decrease the size of the agglomerates increasing the dispersion. The finest dispersion state was achieved with the “initiating” functionalized silica leading to a “grafting from” polymerization of the l-Lactide. Such functionalized silica leads to a nanoscale dispersion in a one-step bulk polymerization with only a few small agglomerates." @default.
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• W1964870838 date "2010-11-01" @default.
• W1964870838 modified "2023-10-16" @default.
• W1964870838 title "In situ polymerization of l-Lactide in the presence of fumed silica" @default.
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• W1964870838 doi "https://doi.org/10.1016/j.matchemphys.2010.06.054" @default.
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