Biodegradation in Soil of PLA/PBAT Blends Compatibilized with Chain Extender

Palsikowski, Paula Alessandra; Kuchnier, Caroline Nogueira; Pinheiro, Ivanei Ferreira; Morales, Ana Rita

doi:10.1007/s10924-017-0951-3

Cited by 160 publications

(105 citation statements)

References 47 publications

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“…To increase the long‐term stability of a polymer, especially in degradative environments like the human body, network structures are sought. For pure polymer networks, chain extenders are common modifiers for polyesters to form long‐chain or branched structures and particularly shown to be efficient for overcoming process‐related degradation . For example, the multifunctional epoxy chain extender, Joncryl (BASF) has proven particularly effective for chain branching as well as a compatibilizer for PLA‐based materials, such as PLA/polybutylene adipate terephthalate, PLA/clay, and PLA/ZnO .…”

Section: Introductionmentioning

confidence: 99%

Effect of poly(2‐ethyl‐2‐oxazoline) and UV irradiation on the melt rheology and mechanical properties of poly(lactic acid)

Zhao

Thompson

Zhu

2019

J of Applied Polymer Sci

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To improve the suitability of poly(lactic acid) (PLA) for implantable devices, it ideally needs greater ductility without losses in strength. Here biodegradable poly(2‐ethyl‐2‐oxazoline) (PEtOx) was selected as an additive to improve hydrophilicity of PLA as well as mechanical properties, while UV irradiation was considered as a bulk modification method to increase the long‐term stability. The PLA blend showed improved tensile strength and elongation‐at‐break with small amounts of PEtOx added (1.5 wt %). Crosslinking by UV irradiation showed significant improvements with a dibutyltin dilaurate catalyst even though it produced a high degree of chain scission during melt processing. After UV irradiation for 150 h, the crosslinked material recovered mechanical properties and melt rheological properties comparable to the initial PLA‐1.5%PEtOx blend (without catalyst added). Crosslinking was only possible with the added PEtOx present. A mechanism for the crosslinking reactions examined has been proposed since it has not been previously reported in the literature. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48023.

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Section: Introductionmentioning

confidence: 99%

Effect of poly(2‐ethyl‐2‐oxazoline) and UV irradiation on the melt rheology and mechanical properties of poly(lactic acid)

Zhao

Thompson

Zhu

2019

J of Applied Polymer Sci

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“…For instance, poly(butylene adipate‐ co ‐terephthalate) (PBAT), a synthetic biodegradable copolyester, and blends comprising PBAT with different kinds of polymers as well as filled/reinforced PBAT systems have been extensively investigated . For agriculture purposes, PBAT was blended with different polymers (such as poly[lactide acid] [PLA], polyhydroxybutyrate [PBT], poly[propylene carbonate] [PPC], starch, chitosan) and filled with different fillers (such as carbon black, CaCO 3 ).…”

Section: Introductionmentioning

confidence: 99%

“…PBAT polymer materials were either exposed in soil (up to 2 years) or compost to biodegrade under real field conditions or biodegradation was simulated in laboratory scale . For high biodegradation rate of PBAT the concentration of terephtalic acid must be lower than 55 % .…”

Section: Introductionmentioning

confidence: 99%

Post‐yield Fracture Mechanics as a Measure of the Degradation of Artificially Aged Biodegradable Mulch Films

Monami¹,

Lach²,

Escudeiro

et al. 2019

Macromolecular Symposia

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An accelerated approach to assess the long‐term performance of biodegradable agriculture films such as mulch films based on poly(butyrate adipate terephthalate) (PBAT) is presented. PBAT films were aged in water and in air at 80 °C for different times and morphological changes were analysed using Fourier‐transform infrared spectroscopy and light microscopy. For exposure in air a Xenon‐arc test chamber was applied. The essential work of fracture concept was used to determine the resistance against crack initiation and propagation as a measure of the degree of degradation. Only at wet conditions as in real applications the films degrade easily. Thus, the films can break in increasingly small parts to become a part of the ground.

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“…Thus, the two polymers form a perfect pair for developing fully biodegradable blends, since the properties of one complement those of the other. Several studies about PLA/PBAT blends have been reported . However, such blends are incompatible and require the presence of compatibilizers for improving the interfacial adhesion and consequently mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The last one are multifunctional additives which contain functional groups able to react with the hydroxyl and carboxyl groups at the end of both polymer chains should provide a good anchorage between them, thus extending the chain an improving the interfacial adhesion . In this sense, multifunctional random copolymers containing epoxide groups have been extensively used, as epoxide groups can readily react with COOH groups located at the end of both PLA and PBAT chains . Zhang et al used a random terpolymer of ethylene, acrylic and glycidyl methacrylate as reactive interfacial agent for PLA/PBAT blends and obtained good compatibilization and higher hardness without affect the tensile strength.…”

Section: Introductionmentioning

confidence: 99%

DGEBA‐Based Epoxy Resin as Compatibilizer for Biodegradable Poly (lactic acid)/Poly(butylene adipate‐co‐terephthalate) Blends

Pereira

Soares

Jesus

et al. 2018

Macromolecular Symposia

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Poly (lactic acid) (PLA) and poly(butylene adipate‐co‐terephthalate) (PBAT) are melt blended in a proportion of 50:50 in the presence of diglycidyl ether of bisphenol A (DGEBA) − based epoxy resin, which plays a role of compatibilizing agent and/or chain extender. The increase of torque values during melt mixing and the molar mass of the polymer in the compatibilized blends suggest that DGEBA acts as a chain extender between the polyesters chains. The blend is immiscible with sea‐island type morphology, as suggested by scanning electron microscopy. The addition of 3 phr of DGEBA results in a decrease of domain size and a better interfacial adhesion, which is also confirmed by rheological behavior. An increase of modulus and tensile strength of the blend is also observed by the addition of 3 phr of DGEBA. Dynamic‐mechanical and thermal properties are also investigated. Therefore, this article provides a new strategy for improving the compatibilization of PLA and PBAT biodegradable polyesters and open new possibilities to develop fully biodegradable polymeric materials.

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Biodegradation in Soil of PLA/PBAT Blends Compatibilized with Chain Extender

Cited by 160 publications

References 47 publications

Effect of poly(2‐ethyl‐2‐oxazoline) and UV irradiation on the melt rheology and mechanical properties of poly(lactic acid)

Effect of poly(2‐ethyl‐2‐oxazoline) and UV irradiation on the melt rheology and mechanical properties of poly(lactic acid)

Post‐yield Fracture Mechanics as a Measure of the Degradation of Artificially Aged Biodegradable Mulch Films

DGEBA‐Based Epoxy Resin as Compatibilizer for Biodegradable Poly (lactic acid)/Poly(butylene adipate‐co‐terephthalate) Blends

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