A novel enzymatic biodegradable route for PLA/EVA blends under agricultural soil of Vietnam

Công, Đỗ Văn; Hoàng, Thái; Giang, Nguyen Vu; Hà, Nguyễn Thu; Лам, Тран Дай; Sumita, Masao

doi:10.1016/j.msec.2011.12.012

Cited by 36 publications

(23 citation statements)

References 18 publications

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“…Singla et al [29] also proved that a strong phase interaction between PLA and EVA exists when 50% VA content was used. At the same time, Cong et al [30], Aghjeh et al [31] and Yoon et al [32], mixed 18%, 18% and 70% VA content EVA with PLA, respectively. However, they achieved only moderate improvement in ductility (either strain or impact strength) even at 20-30 mass% EVA content, due to the lack of compatibility between the phases.…”

Section: Introductionmentioning

confidence: 91%

“…Although annealing was found to be an effective tool to overcome the low HDT of PLA products, at the same time, annealing is not enough to improve the impact strength of PLA to a desired level, such as the impact strength of the widely used tough polymer acrylonitrile butadiene styrene copolymer (ABS) (* 20 kJ m -2 notched Charpy impact strength). One possible way to improve the impact properties of PLA is to add low-modulus and high-toughness polymers like ethylene vinyl acetate copolymer (EVA) [27][28][29][30][31][32][33][34][35]. EVA is a copolymer of ethylene and vinyl acetate, and it is a thermoplastic elastomer (not vulcanized) with high flexibility and toughness, widely used in the plastic industry.…”

Section: Introductionmentioning

confidence: 99%

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The application of the synergistic effect between the crystal structure of poly(lactic acid) (PLA) and the presence of ethylene vinyl acetate copolymer (EVA) to produce highly ductile PLA/EVA blends

Tábi

2019

J Therm Anal Calorim

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In this paper, we produced ethylene vinyl acetate copolymer (EVA)-filled poly(lactic acid) (PLA) blends by extrusion and injection moulding. We annealed the injection-moulded specimens at 80°C, 100°C, 120°C and 140°C to produce various crystal structures in PLA. Then we investigated the cross-effect between the crystal structure of PLA and the presence of EVA on the mechanical, impact, calorimetric, thermomechanical and heat deflection temperature properties of the blends. We found a synergistic toughening effect between the crystal structure of PLA that developed during annealing and the presence of dispersed EVA particles in the PLA matrix. The blend had a very high impact strength of over 65 kJ m-2 , which is three times higher than the impact strength of acrylonitrile butadiene styrene copolymer (* 20 kJ m-2), and thus it is very promising for technical applications.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

The application of the synergistic effect between the crystal structure of poly(lactic acid) (PLA) and the presence of ethylene vinyl acetate copolymer (EVA) to produce highly ductile PLA/EVA blends

Tábi

2019

J Therm Anal Calorim

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“…[1] However, its high brittleness, slow crystallization rate, and low heat distortion temperature restricts its widespread use. Many researches have been done to improve physical properties of PLA.…”

Section: Introductionmentioning

confidence: 99%

Glycidyl Methacrylate Grafted Polylactic Acid: Morphological Properties and Crystallization Behavior

Kangwanwatthanasiri

Suppakarn

Ruksakulpiwat

2015

Macromolecular Symposia

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Summary In this study, physical properties of glycidyl methacrylate grafted polylactic acid (PLA‐g‐GMA) were studied and compared with those of polylactic acid (PLA). PLA‐g‐GMA was prepared by using an internal mixer. Differences in crystallization characteristics between PLA‐g‐GMA and PLA were observed from X‐ray diffraction (XRD). After applying tensile stress to PLA‐g‐GMA and PLA samples, diffraction peak (2θ) at about 29° was clearly occurred only in PLA‐g‐GMA samples. This implies that small crystals may be formed during applying tensile stress to PLA‐g‐GMA. The stress‐strain curve of PLA‐g‐GMA exhibits necking and cold drawing characteristic which was not observed in PLA. Fracture behavior in the tensile test changed from the brittle fracture of neat PLA to the ductile fracture of PLA‐g‐GMA. Fibrillar structure of PLA‐g‐GMA from tensile fractured surface were observed by scanning electron microscope (SEM). In contrast, PLA did not show fibrillar structure from SEM micrographs. From differential scanning calorimetry (DSC), PLA‐g‐GMA shows lower glass transition temperature (Tg) and crystallization temperature (Tc) than PLA. Melt crystallization during cooling was observed only from PLA‐g‐GMA. Moreover, PLA‐g‐GMA showed only one melting peak while PLA showed two melting peaks. This indicated different types of crystal forms between PLA‐g‐GMA and PLA. Crystal forms in PLA‐g‐GMA may be less perfect and can be rearranged due to higher chain flexibility during tensile stress. Thus, significantly higher elongation at break of PLA‐g‐GMA was obtained compared to that of PLA.

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“…The properties of EVA copolymer usually depend on concentration of VA. EVA copolymer with low VA content (<20%) are usually employed as thermoplastics, whereas those with high levels of VA are generally considered as oil-resistant elastomers [11,12]. Several works have been carried out for PLA/EVA blends and reported that the incorporation of EVA into PLA significantly improved the elongation at break, toughness, and impact strength of PLA [13][14][15][16][17]. Moreover, the addition of reactive agents could further improve the compatibility between polymers, for instance, glycidyl methacrylate [18], phthalic anhydride [19], and peroxide [20,21].…”

Section: Introductionmentioning

confidence: 99%

Development of PLA/EVA Reactive Blends for Heat-Shrinkable Film

et al. 2019

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Heat-shrinkable films have widely been used for various applications such as shrinkable labels and cap seals. These plastics have generally a short life. The biodegradable polymers can thus be an ideal candidate for such applications. This work aimed to study the stretching and shrinking ratio of poly(lactic acid)/ethylene vinyl acetate through reactive blends system for heat-shrinkable films application. The reactive agents, Joncryl® and Perkadox were used as in situ compatibilizers. PLA/EVA with 100/0, 97/3, 95/5, 93/7, and 90/10 ratios were prepared in the twin screw extruder. Neat PLA and PLA/EVA films were fabricated by blown film extrusion. The results revealed that the elongation at break of PLA in the TD direction was improved when adding EVA. PLA and EVA film with 0.1 phr of Perkadox was found to be sufficient as evident by FESEM micrograph and DMTA results. The films were stretched and shrunk at a temperature of 70 °C. The percentage of shrinkage of the stretched PLA/EVA reactive blend films, two and three times were, 100%, approximately. On the other hand, the four-times stretched films shrunk less than 100% because of the excessive stretching, which resulted in film breakage and defect.

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A novel enzymatic biodegradable route for PLA/EVA blends under agricultural soil of Vietnam

Cited by 36 publications

References 18 publications

The application of the synergistic effect between the crystal structure of poly(lactic acid) (PLA) and the presence of ethylene vinyl acetate copolymer (EVA) to produce highly ductile PLA/EVA blends

The application of the synergistic effect between the crystal structure of poly(lactic acid) (PLA) and the presence of ethylene vinyl acetate copolymer (EVA) to produce highly ductile PLA/EVA blends

Glycidyl Methacrylate Grafted Polylactic Acid: Morphological Properties and Crystallization Behavior

Development of PLA/EVA Reactive Blends for Heat-Shrinkable Film

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