Moisture management of polylactides: The effect of heat treatment

Koo, Donghun; Du, An; Palmese, Giuseppe R.; Cairncross, Richard A.

doi:10.1016/j.polymer.2012.01.024

Cited by 11 publications

(8 citation statements)

References 28 publications

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“…These values are a little lower than those found in the literature but diffusion coefficients are similar [14,15,26]. PLA grades are not the same and morphology is known to affect the water uptake [27,28]. Processing can also induce morphological changes.…”

Section: Molecular Weight Measurementmentioning

confidence: 47%

Accelerated ageing of polylactide in aqueous environments: Comparative study between distilled water and seawater

Deroiné

Duigou

Corre

et al. 2014

Polymer Degradation and Stability

207

111

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Pollution of nature by plastics is a major environmental problem and the challenge for the future is to manage the lifetime of polymers better. The aim of this study is to establish a baseline on degradation mechanism and degradation kinetics for lifetime prediction of polylactide (PLA) in a marine environment. The ageing of PLA was accelerated by raising temperature in distilled water, filtered and renewed seawater and natural seawater. Samples were immersed in distilled water for six months at different temperatures (25, 30, 40 and 50°C) in order to evaluate the influence of temperature on PLA degradation kinetics and to predict lifetime. Then, samples were immersed in seawater both in the laboratory and at sea, in order to compare the effects of environment, marine organisms and salt, on degradation. The different degradation steps were followed by gravimetry, tensile tests, scanning electron microscopy (SEM), steric exclusion chromatography (SEC) and differential scanning calorimetry (DSC). In distilled water, accelerated ageing of PLA is complex with deviation from Fickian behaviour at higher temperature. Moreover, immersion in distilled water induces morphological changes, in particular holes, which are absent in seawater at 40°C for the same immersion time. Indeed, seawater has little impact on the diffusion kinetics but affects M ∞ values, which are slightly lower compare to the distilled water uptake.

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Section: Molecular Weight Measurementmentioning

confidence: 47%

Accelerated ageing of polylactide in aqueous environments: Comparative study between distilled water and seawater

Deroiné

Duigou

Corre

et al. 2014

Polymer Degradation and Stability

207

111

View full text Add to dashboard Cite

show abstract

“…For the specific case of PLA, the effect of crystallinity on water barrier properties in general, and on water sorption in particular, is still not fully understood, and so many different results can be found in the literature. Some reports, for instance, claim that water absorption decreases in line with increased crystallinity, while others report the opposite behaviour . Also, some papers report different behaviours in water sorption and water diffusion measurements, depending on test conditions .…”

Section: Introductionmentioning

confidence: 99%

“…Some reports, for instance, claim that water absorption decreases in line with increased crystallinity, 17 while others report the opposite behaviour. 18 Also, some papers report different behaviours in water sorption and water diffusion measurements, depending on test conditions. 19 In any case, despite crystallinity effects, it has been shown that improvements in the barrier properties of nanocomposites is related, at least partially, to the nanomaterial.…”

Section: Introductionmentioning

confidence: 99%

Hybrid poly(lactic acid)/nanocellulose/nanoclay composites with synergistically enhanced barrier properties and improved thermomechanical resistance

Trifol

Plackett

Sillard

et al. 2016

Polymer International

113

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(2016). Hybrid poly(lactic acid)/nanocellulose/nanoclay composites with synergistically enhanced barrier properties and improved thermomechanical resistance. Polymer International, 65(8) Keywords:Cellulose nanofibres (CNF), nanoclay, polylactic acid (PLA), nanocomposites, barrier properties, thermomechanical properties Abstract:Poly(lactic acid) (PLA)-based hybrid nanocomposites (PLA, nanoclay and nanocellulose) were prepared by reinforcing neat PLA with commercially available nanoclay (Cloisite C30B) and nanocellulose, in the form of either partially acetylated cellulose nanofibres (CNF) or nanocrystalline cellulose (CNC).Composites with 1 or 5 wt% of nanocellulose, in combination with 1, 3 and 5 wt% of nanoclay, were prepared, and their barrier properties were investigated. It was found that the combination of clay and nanocellulose clearly results in synergistic behaviour in terms of the oxygen transmission rate (OTR) through a reduction of up to 90% in OTR and a further reduction in the water vapour transmission rate (WVTR) of up to 76%. In addition, the nanocomposite films showed improved thermomechanical resistance and improved crystallisation kinetics while maintaining high film transparency. This makes hybrid PLA/CNF/C30B nanocomposites a very promising material for food packaging applications.

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“…Therefore, the interest in developing biodegradable "green" materials without any environmental pollution is rapidly growing. 3,4 As an environmentally friendly polymer, PLA has been emerging as an alternative to conventional polymeric materials due to its renewability, biodegradability, and greenhouse gas neutrality. 2 A large number of biodegradable polymers exist which can be produced from both natural and synthetic sources.…”

Section: Introductionmentioning

confidence: 99%

“…Among all of the available bio-based polymers, PLA is a promising biopolymer which can be obtained from biomass through a fermentation process of renewable sources such as corn, potatoes, and sugarcane. 3,4 As an environmentally friendly polymer, PLA has been emerging as an alternative to conventional polymeric materials due to its renewability, biodegradability, and greenhouse gas neutrality. 5 Also, due to its excellent biocompatibility, easy processability, and good mechanical strength, PLA has exhibited great potential applications in many fields, such as biomedical devices, packaging, and automotive industries.…”

Section: Introductionmentioning

confidence: 99%

The morphology, rheological, and mechanical properties of wood flour/starch/poly(lactic acid) blends

Tan

et al. 2017

J of Applied Polymer Sci

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An entirely biosourced blend composed of poly(lactic acid) (PLA), starch, and wood flour (WF) was prepared by a coextruder with glycerol as a plasticizer. The morphology, rheological properties, and mechanical properties of the WF/starch/PLA blends were comprehensively analyzed. The results showed that with the decrease of the starch/WF ratio, the morphology experienced a large transformation, and the compatibility of the blends was found to be superior to other blends, with a starch/wood flour ratio of 7/3. The dynamic mechanical thermal analysis (DMA) results demonstrated the incompatibility of the components in WF/starch/ PLA blends. Following the decrease of the starch/WF ratio, the storage modulus (G 00 ) and the complex viscosity (h*) of the blends increased. The mechanical strength first increased, and then decreased with the increase of the WF concentration. The water absorption results showed that the water resistance of the blends was reduced with the lower starch/WF ratio.

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Moisture management of polylactides: The effect of heat treatment

Cited by 11 publications

References 28 publications

Accelerated ageing of polylactide in aqueous environments: Comparative study between distilled water and seawater

Accelerated ageing of polylactide in aqueous environments: Comparative study between distilled water and seawater

Hybrid poly(lactic acid)/nanocellulose/nanoclay composites with synergistically enhanced barrier properties and improved thermomechanical resistance

The morphology, rheological, and mechanical properties of wood flour/starch/poly(lactic acid) blends

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