Nucleation and crystallization kinetics of poly(lactic acid)

Santis, Felice De; Pantani, Roberto; Titomanlio, G.

doi:10.1016/j.tca.2011.05.034

Cited by 105 publications

(79 citation statements)

References 16 publications

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“…The molecular weight distribution was characterized by chromatography: Mn ¼ 145,000 and Mw ¼ 235,000. The crystallization kinetics and the viscosity of the material were assessed in previous works, also considering the effect of previous thermo-mechanical histories [6,7].…”

Section: Methodsmentioning

confidence: 99%

A spectroscopic approach to assess transport properties of water vapor in PLA

2015

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Section: Methodsmentioning

confidence: 99%

A spectroscopic approach to assess transport properties of water vapor in PLA

2015

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“…This usually occurs because PLA crystallization is too slow to develop significant crystallinity. Several reviews have reported the low crystallization kinetics of PLA [41][42][43]. The second heating thermograms for the as received and processed PLA are shown in Figure 1.…”

Section: Thermal Properties Analysismentioning

confidence: 99%

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

Hernández-Alamilla

Valadez-González

2015

Journal of Polymer Engineering

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Abstract The effect of two commercial melt strength enhancer additives, Paraloid BPMS-250 (BPMS) and Biostrength 700 (BIOS), on the thermal, rheological and morphological properties of polylactide (PLA) was studied. Thermal analyses showed that both the BPMS and BIOS additives decreased the ability of PLA to crystallize. The rheological tests indicated that zero-shear viscosity and storage modulus of the PLA/BPMS and PLA/BIOS blends were significantly increased with the additive content. These could be attributed to the entanglements between the PLA chains with those of the high molecular weight additive, creating a physical network which reduces the segmental mobility of PLA and improves the melt elasticity of the blend. The entanglement molecular weights (Me) of PLA/BPMS and PLA/BIOS blends were lower than those of unprocessed and processed PLA (Me≈4×104 g/mol), which suggests greater chain entanglements and a higher entanglement density (ve). The elongational viscosity (ηE) and melt strength values were estimated using a screw-extrusion capillary rheometer, where the PLA/BIOS blends presented the highest values. Finally, scanning electron microscopy on the samples was carried out to assess the blend morphology.

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“…Due to the very slow crystallization kinetics of this grade of PLA [18], the injection-moulded samples resulted to be fully amorphous. These samples will be referred to as amorphous PLA.…”

Section: Samples Preparationmentioning

confidence: 99%