Development of polylactide bead foams with double crystal melting peaks

Nofar, Mohammadreza; Ameli, Amir; Park, Chul

doi:10.1016/j.polymer.2015.05.048

Cited by 154 publications

(120 citation statements)

References 38 publications

(57 reference statements)

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“…The formation of a smaller peak at a lower temperature has been widely reported for PLA systems, particularly for systems containing plasticizers [20,21] including dissolved CO 2 for foaming purpose [23], and is attributed to the segregation of less perfect crystals. …”

Section: Thermal Characteristics By Dsc Analysismentioning

confidence: 88%

Thermal transitions and solidification kinetics of poly(lactic acid) and blends with epoxidized natural rubber

et al. 2016

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Citation: MASCIA, L. ...et al., 2016. Thermal transitions and solidification kinetics of poly(lactic acid) and blends with epoxidized natural rubber. Thermochimica Acta, 633, pp. 82-90. Additional Information:• This paper was accepted for publication in the journal Ther- AbstractThe reactivity of polylactic acid (PLA) with epoxidized natural rubber (ENR50) was confirmed by monitoring the changes in melt viscosity during mixing and by TGA runs.The plasticization resulting from a partial miscibilization of ENR50 during mixing was found to have opposite effects on the crystallization of the PLA matrix, depending on the temperature scanning mode. An increase in heat of crystallization (ΔHc) with increasing temperature scanning rate was observed when heated from the glassy state, while a corresponding reduction in ΔHc was obtained in cooling scans from the melt.Studies on the kinetics of events have shown that the classical Kissinger plots for crystallization by heating from the glassy state display a variable activation energy for the case of the reactive blend. The vitrification kinetics, on the other hand, could be modelled quite accurately with the Mahadevan method for all systems, including an intrinsically amorphous PLA.

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Section: Thermal Characteristics By Dsc Analysismentioning

confidence: 88%

Thermal transitions and solidification kinetics of poly(lactic acid) and blends with epoxidized natural rubber

et al. 2016

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“…Crystalline nucleation and growth are highly influential in this process, when it takes place at the vicinity of the crystallization temperature [5,13]. The formation of a network of nucleated crystals during foaming and stabilization increases the expansion ratio by minimizing gas loss and cell coalescence [1,6,14,15]. These benefits can be accomplished through careful choice of processing conditions, and addition of nucleating agents, such as talc and nanosilica [1,16].…”

Section: Introductionmentioning

confidence: 99%

Transition from microcellular to nanocellular PLA foams by controlling viscosity, branching and crystallization

Tiwary

Park

Kontopoulou

2017

European Polymer Journal

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“…Besides this challenge, the said bead foaming method is a long and an expensive processing route due to the long gas impregnation period and two-step processing cycles. To overcome these drawbacks, we developed a new technology to produce EPLA bead foams while creating a double crystal melting peak structure in the foamed beads [39,40]. In this short and single-step processing technology, on which a patent is issued [39], high-temperature melting peak crystals are generated during an isothermal gas-saturation step (i.e., a batch-based bead foaming process) and are utilized to maintain the bead geometry during the molding even at a high temperature required for good sintering.…”

Section: Introductionmentioning

confidence: 99%