Investigation on the Influence of EVA Content on the Mechanical and Thermal Characteristics of Poly(lactic acid) Blends

Sangeetha, V.; Valapa, Ravi Babu; Nayak, Sanjay K.; Varghese, T.O.

doi:10.1007/s10924-016-0906-0

Cited by 41 publications

(32 citation statements)

References 32 publications

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“…reported that increasing the HDPE content barely shifted the temperature ( T dmax1 ) relative to the PLA degradation. On the other hand, Sangeetha et al . investigated blends of PLA/EVA and referred the second DTG peak ( T dmax2 ) to the degradation of the polyethylene segments of the EVA.…”

Section: Resultsmentioning

confidence: 99%

Rheological behavior and morphological and interfacial properties of PLA/TPE blends

Bernardes

Luiz

Santana

et al. 2019

J of Applied Polymer Sci

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Rheological and interfacial tension data were employed to predict the morphology and thermal and mechanical properties of noncompatibilized and compatibilized poly(lactic acid) (PLA)/thermoplastic elastomer (TPE) blends. PLA was melt blended with thermoplastic polyurethane (TPU) and ethylene elastomer (EE) and compatibilized by ethylene-butyl acrylate-glycidyl methacrylate (EBG) in an internal mixer chamber. Both TPU and EE TPEs have higher viscosities than PLA, and the interfacial properties evaluated have revealed better adhesion between domains of PLA-TPU. The efficiency of the compatibilizer agent EBG depended on the TPE type inferred by modifications in the scanning electron microscopy images of PLA/TPE blends and by the Izod impact strength (improved by 23%). The EBG was more effective in the PLA/TPU blend. The TPEs and EBG did not affect the PLA thermal stability, and no thermal event was observed in the usual PLA extrusion and injection temperature range.

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Section: Resultsmentioning

confidence: 99%

Rheological behavior and morphological and interfacial properties of PLA/TPE blends

Bernardes

Luiz

Santana

et al. 2019

J of Applied Polymer Sci

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“…The cold crystallization temperature (T cc ) and its enthalpy DH cc were determined from the exothermal processes in the DSC scans at all heating runs. The degree of crystallinity (X cc %) of the samples was calculated with the following equation: (1) where w is the mass fraction of PLA and °∆ m H is the enthalpy of fusion of 100% crystalline PLA, which has a value of 93.6 J/g [33].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…This model implies that during the process of transformation, the activation energy, E, should differ during the transformation. The Kissinger approach has been used in several recent studies [1,10,17,35,40]. The kinetic model equation combined with the Arrhenius method to the temperature function of the reaction rate constant can usually be defined as follows [43,44]: (6) where t is the time, T is the temperature, α is the relative degree of crystallinity, A (s -1 ) is the pre-exponential (frequency) factor, E (kJ mol -1 ) is the activation energy, R is the universal gas constant, and f(α) is the reaction model.…”

Section: Activation Energy Of Crystallizationmentioning

confidence: 99%

“…PLA is a linear aliphatic polyester that results from renewable resources, such as sugar cane and maize [1]. PLA is a semicrystalline polymer with a glass transition temperature (T g ) of approximately 60°C and a melting temperature of approximately 170°C [2].…”

Section: Introductionmentioning

confidence: 99%

“…One strategy involves mixing PLA with traditional synthetic polymers or with other biodegradable polymers. At present, PLA has been mixed with many kinds of polymers with very distinct features, biodegradable or nonbiodegradable, amorphous or semicrystalline, such as poly(ethylene glycol) (PEG) [2], poly(ethylene-co-vinyl acetate) (EVA) [1,5], poly(hydroxy ester ether) (PHEE) [6], starch [7], poly(vinyl alcohol) (PVA) [8], poly(butylene terephthalate) (PBT) [9], poly(β-hydroxybutyrate) (PHB) [10] and chemically modified polyhydroxyoctanoate (mPHO) [11]. Poly(3-hydroxyalkanoates) (PHAs) are microbially derived and renewable biodegradable polymers [12].…”

Section: Introductionmentioning

confidence: 99%

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Nonisothermal Cold Crystallization Kinetics of Poly(lactic acid)/Bacterial Poly(hydroxyoctanoate) (PHO)/Talc

2019

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The effects of bacterial poly(hydroxyoctanoate) (PHO) and talc on the nonisothermal cold crystallization behaviours of poly(lactic acid) (PLA) were analysed with differential scanning calorimetry (DSC), and the thermal stability of the samples was observed with thermal gravimetric analysis (TGA). The modified Avrami’s model was used to describe the nonisothermal cold crystallization kinetics of neat PLA and its blends. The activation energies E for nonisothermal cold crystallization were calculated by the isoconversional method of Kissinger-Akahira-Sunose (KAS). The DSC results showed that the PLA/PHO blends were immiscible in the whole studied range, and as the PHO and talc content increased, the crystallization rate of PLA accelerated, and the crystallinity of PLA in the PLA samples increased. The values of the Avrami exponent indicated that the nonisothermal cold crystallization of the neat PLA and its blends exhibited heterogeneous, three-dimensional spherulitic growth. The E values were strongly dependent on PHO and talc. The TGA results showed that the presence of PHO and talc slightly influenced the thermal stability of PLA.

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Tailoring the performance of poly(lactic acid)‐based reactive blends: The effect of vinyl acetate and dicumyl peroxide content

Ferreira

Nascimento

Luna

et al. 2023

J of Applied Polymer Sci

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Poly(lactic acid) has been gaining prominence in academia and industry, mainly due to being a biopolymer and biodegradable material. Nevertheless, mainly due to its high fragility, work has been carried out in order to seek alternatives to improve this drawback. Hence, this work aims to evaluate the effect of the vinyl acetate content using two types of EVA (EVA1 with 28% and EVA2 with 19%) in dynamically vulcanized PLA/EVA blends, using several dicumyl peroxide (DCP) contents, that is, 0.3, 0.5, and 0.7 phr. Blends were produced using an internal mixer, and the tensile, impact and HDT specimens were injection molded. By FTIR and torque rheometry, it was verified that, upon DCP addition, there was evidences of reticulation, resulting in crosslinked PLA, crosslinked EVA, as well as PLA‐g‐EVA. Through tensile and impact strength tests, it was observed substantial increases in the elongation at break, and in impact strength, mainly for the compounds with higher content of vinyl acetate (EVA1). Impact specimens made with PLA/EVA120 0.7 DCP, PLA/EVA130 0.5 DCP, and 0.7 DCP, did not completely break, due to the probable development of the in situ PLA‐g‐EVA compatibilizer among the present phases. Therefore, it is believed that a more homogeneous microstructure was obtained, as observed by SEM images, highlighted upon the DCP content increase. It was verified that the highest vinyl acetate content is of paramount importance for obtaining PLA/EVA blends with better compatibility as well as EVA1 being more susceptible to crosslinking using DCP, resulting in blends with greater toughness.

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Investigation on the Influence of EVA Content on the Mechanical and Thermal Characteristics of Poly(lactic acid) Blends

Cited by 41 publications

References 32 publications

Rheological behavior and morphological and interfacial properties of PLA/TPE blends

Rheological behavior and morphological and interfacial properties of PLA/TPE blends

Nonisothermal Cold Crystallization Kinetics of Poly(lactic acid)/Bacterial Poly(hydroxyoctanoate) (PHO)/Talc

Tailoring the performance of poly(lactic acid)‐based reactive blends: The effect of vinyl acetate and dicumyl peroxide content

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