A review on the thermomechanical properties and biodegradation behaviour of polyesters

Larrañaga, Aitor; Lizundia, Erlantz

doi:10.1016/j.eurpolymj.2019.109296

Cited by 169 publications

(175 citation statements)

References 383 publications

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“…[28] These degradation by-products autocatalyze the hydrolysis since they may decrease the pH of the medium. [4] In the second stage, the degradation by-products diffuse outward the sample leading to a weight loss. [4,12,21] Since the diffusion of the degradation by-products outward the sample is facilitated at the surface, acid-catalyzed hydrolysis is more intense in the bulk PLA.…”

Section: Water Uptake and Weight Loss Measurementsmentioning

confidence: 99%

“…[4] In the second stage, the degradation by-products diffuse outward the sample leading to a weight loss. [4,12,21] Since the diffusion of the degradation by-products outward the sample is facilitated at the surface, acid-catalyzed hydrolysis is more intense in the bulk PLA. [4] Probably, the increase in test temperature facilitated water diffusion into PLA, as well as the hydrolysis reaction rate.…”

Section: Water Uptake and Weight Loss Measurementsmentioning

confidence: 99%

“…[2,3] However, the poor thermal resistance and barrier performance and also inherent brittleness are some disadvantages of PLA restricting its applications. [3,4] A special use of PLA has been in textile and biomedical applications like sutures, stents, tissue engineering, and drug delivery. [4] PLA polymers can be amorphous or semicrystalline depending on their structure (molar mass and the amount of D-enantiomers) [5] and processing conditions (cooling rate and annealing).…”

Section: Introductionmentioning

confidence: 99%

“…[3,4] A special use of PLA has been in textile and biomedical applications like sutures, stents, tissue engineering, and drug delivery. [4] PLA polymers can be amorphous or semicrystalline depending on their structure (molar mass and the amount of D-enantiomers) [5] and processing conditions (cooling rate and annealing). The physical, mechanical, thermal, and barrier properties of PLA are dependent on its morphology and crystallinity.…”

Section: Introductionmentioning

confidence: 99%

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Retardation effect of nanohydroxyapatite on the hydrolytic degradation of poly (lactic acid)

Watai

Calvão

Rigolin

et al. 2020

Polymer Engineering & Sci

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Poly (lactic acid) (PLA) and PLA/nanohydroxyapatite (nHA) composites, containing 2 wt% and 5 wt% of nHA were subjected to in vitro hydrolytic degradation tests in saline phosphate solution at different temperatures (37°C, 48°C, 60°C, and 72°C) to accelerate degradation. Samples were characterized by water uptake, weight loss tests, size exclusion chromatography (SEC), differential scanning calorimetry (DSC), and visual analyses. Arrhenius equation was used to describe the behavior of weight loss as a function of time. The PLA activation energy of weight loss showed to be lower than that of the PLA/nHA composites, indicating that the incorporation of nHA retarded the hydrolytic degradation. The rate and percentage of weight loss increased with increasing temperature. All samples presented a decrease in Tg and an increase in degree of crystallinity as a function of time. Incorporation of nHA retarded this behavior that showed to be more expressive in PLA containing 5 wt% nHA.

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Section: Water Uptake and Weight Loss Measurementsmentioning

confidence: 99%

Section: Water Uptake and Weight Loss Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Retardation effect of nanohydroxyapatite on the hydrolytic degradation of poly (lactic acid)

Watai

Calvão

Rigolin

et al. 2020

Polymer Engineering & Sci

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“…Of course, the degradation undergone during processing and the environmental degradation during the lifetime are the main hindrances to the recycling of these polymers. It is, indeed, well known that these biodegradable polymers are quite labile with respect to both thermomechanical degradation [ 15 , 16 , 17 , 18 ] and photo-oxidation [ 19 , 20 , 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Recycling of a Biodegradable Polymer Blend

et al. 2020

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Mechanical recycling is one of the possible ways to enhance the value of postconsumer plastic materials. However, the final performance of the recycled material will strongly depend on the quality of the selection made on the recycled product and on the degradation of the properties. In this context, the present study examines the effect of reprocessing for five successive extrusion cycles on the rheological, mechanical and thermal properties of a poly(butylene adipate-co-terephthalate) (PBAT)-based blend on samples reprocessed in both dry and wet conditions. The results showed that when the sample was processed after drying, degradation of the material was less than when it was processed in wet conditions. However, the experimental results showed that the decrease of rheological and mechanical properties was not so dramatic, and therefore the material could be reused in both cases.

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