Annealing Effect on Pla/Eva Blends Performance

Ferreira, Eduardo da Silva Barbosa; Luna, Carlos Bruno Barreto; Siqueira, Danilo Diniz; Araújo, Edcleide Maria; França, Danyelle Campos; Wellen, Renate Maria Ramos

doi:10.1007/s10924-021-02220-4

Cited by 30 publications

(31 citation statements)

References 46 publications

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“…[8][9][10][11] Annealing is widely used for the recrystallization of PLA-based materials. [12][13][14][15] Improvement of thermo-mechanical properties is sometimes obtained by mixing PLAs of different molar masses or with other biodegradable polymers. 16,17 Typically, PLA homopolymer has three crystal forms, 8,9,[18][19][20] such as α-, ß-, and γ-form, which depend on the crystallization conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of annealing on thermal and dynamic mechanical properties of poly(lactic acid)

Zennaki

Zair

Arabeche

et al. 2022

J of Applied Polymer Sci

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Effects of annealing temperature (Ta: 80-140°C) and time (ta: 3-30 h) on the crystalline phase transition in poly(lactic acid) (PLA) were studied by Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA). In the DSC curves, the sample annealed at Ta=80°C with time interval (ta: 10-30 h) demonstrates a peculiarly small exothermal peak (Texo) around 130°C, just prior to the melting point, corresponding to the disorder-to-order ('-to-) phase transition, while the sample annealed at temperature (Ta: 90-110°C) shows a double melting behavior considered as the '- phase transition. At Ta>110°C, the ′ -form of PLA was found to transform into the  one during the annealing process. The '-phase transition around 100°C (Ta: 90-110°C), determined from the two melting peaks (Tm1 and Tm2) as function of Ta at different times ta, shows a good correlation with the substantial increase in the crystallinity rate (Xc) with a maximum of 32% at Ta=120°C. Towards low temperatures, the glass modulus Eg reported by DMA thermograms, shows an important increase (30 000 MPa) at Ta=80°C for ta=3 h, due to the nucleation density extremely high in low PLA materials crystallization. After a sharp drop to 3 600 MPa at Ta=110°C, a marked improvement of Eg (15 900 MPa) is observed around Ta=120°C for all samples, regardless of time ta, temperature region where PLA is usually molded in the industrial melt processing. This interesting effect (improvement of Eg in range Ta=100-120°C) can be correlated with the grow of crystallinity in the same domain of Ta, and the '- phase transition Ta (Ta: 90-110 °C) determinate by the double Tm melting DSC peak, which is confirmed by the increase of Tg for Ta=90-110°C.

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Section: Introductionmentioning

confidence: 99%

“…Thus, the crystalline form is necessary to increase the strength of the material 8–11 . Annealing is widely used for the recrystallization of PLA‐based materials 12–15 . Improvement of thermo‐mechanical properties is sometimes obtained by mixing PLAs of different molar masses or with other biodegradable polymers 16,17 …”

Section: Introductionmentioning

confidence: 99%

Effect of annealing on thermal and dynamic mechanical properties of poly(lactic acid)

Zennaki

Zair

Arabeche

et al. 2022

J of Applied Polymer Sci

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“…Pure PLA showed the highest value of hardness, with a value of 75 Shore D due to the high stiffness of this material [ 43 , 44 , 45 ]. The addition of 5% EE-g-GMA and POE-g-GMA subtly reduced the Shore D hardness compared to pure PLA.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Poly(lactic acid) (PLA) Properties: Effect of the Impact Modifiers EE-g-GMA and POE-g-GMA

et al. 2021

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Poly(ethylene-octene) grafted with glycidyl methacrylate (POE-g-GMA) and ethylene elastomeric grafted with glycidyl methacrylate (EE-g-GMA) were used as impact modifiers, aiming for tailoring poly(lactic acid) (PLA) properties. POE-g-GMA and EE-g-GMA was used in a proportion of 5; 7.5 and 10%, considering a good balance of properties for PLA. The PLA/POE-g-GMA and PLA/EE-g-GMA blends were processed in a twin-screw extruder and injection molded. The FTIR spectra indicated interactions between the PLA and the modifiers. The 10% addition of EE-g-GMA and POE-g-GMA promoted significant increases in impact strength, with gains of 108% and 140%, respectively. These acted as heterogeneous nucleating agents in the PLA matrix, generating a higher crystallinity degree for the blends. This impacted to keep the thermal deflection temperature (HDT) and Shore D hardness at the same level as PLA. By thermogravimetry (TG), the blends showed increased thermal stability, suggesting a stabilizing effect of the modifiers POE-g-GMA and EE-g-GMA on the PLA matrix. Scanning electron microscopy (SEM) showed dispersed POE-g-GMA and EE-g-GMA particles, as well as the presence of ligand reinforcing the systems interaction. The PLA properties can be tailored and improved by adding small concentrations of POE-g-GMA and EE-g-GMA. In light of this, new environmentally friendly and semi-biodegradable materials can be manufactured for application in the packaging industry.

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“…The original material of PLA is starch, which is easily decomposed into carbon dioxide and water by microorganisms in nature after use. It not only does not produce pollution in the production process, but also has good biodegradability and biocompatibility [ 113 , 114 ]. At the same time, PLA can be used as a drug agent and can be broken down into carbon dioxide and water in the human body, thus displaying no toxicity or side effects for the human body.…”

Section: Microsphere Processing Materialsmentioning

confidence: 99%

Progress in the application of sustained-release drug microspheres in tissue engineering

Ruan¹,

Su²,

Qin³

et al. 2022

Materials Today Bio

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Annealing Effect on Pla/Eva Blends Performance

Cited by 30 publications

References 46 publications

Effect of annealing on thermal and dynamic mechanical properties of poly(lactic acid)

Effect of annealing on thermal and dynamic mechanical properties of poly(lactic acid)

Tailoring Poly(lactic acid) (PLA) Properties: Effect of the Impact Modifiers EE-g-GMA and POE-g-GMA

Progress in the application of sustained-release drug microspheres in tissue engineering

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