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- W2606361595 abstract "This study investigates the influence of material properties and foaming temperature on the cellular structure of foams produced by batch foaming of linear, branched and nucleated polylactide (PLA), using supercritical nitrogen. Higher viscosities, corresponding to low foaming temperatures, resulted in smaller cell sizes within the investigated foaming temperature range of 140–180 °C, whereas higher foaming temperatures favoured larger volume expansion ratio (VER). In the presence of branching the PLAs exhibited strain hardening, which served to stabilize the foams and resulted in a finer cellular structure and improved VERs. Formulations containing boron nitride (BN) nucleating agent could not foam at the lowest temperature of 140 °C, because of crystallization taking place at this temperature. A combination of branching and nucleation achieved by reactive modification of PLA using peroxide and coagent crosslinking agents yielded the best results. The cell densities of foams made out of this formulation were significantly higher compared to the rest of the formulations, of the order of 1011 cells/cm3. Very fine, sub-micron sized foams were obtained when this material was foamed at 140 °C, which is close to its exothermic crystallization temperature. This work provides guidelines of the ranges of material property values that are more conducive to achieve micro- and sub-micron sized foams." @default.
- W2606361595 created "2017-04-28" @default.
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- W2606361595 date "2017-06-01" @default.
- W2606361595 modified "2023-10-13" @default.
- W2606361595 title "Transition from microcellular to nanocellular PLA foams by controlling viscosity, branching and crystallization" @default.
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- W2606361595 doi "https://doi.org/10.1016/j.eurpolymj.2017.04.010" @default.
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