Melt Rheology of Poly(Lactic Acid)/Low Density Polyethylene Polymer Blends

Hamad, Kotiba; Kaseem, Mosab; Deri, Fawaz

doi:10.4236/aces.2011.14030

Cited by 61 publications

(38 citation statements)

References 24 publications

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“…In the past decades, the demand for lactic acid has been significantly high, especially for its application in biodegradable polymers, i.e., polylactic acid (PLA), which has a potential to replace traditional commodity plastics. PLA-based plastics have some unique features such as high tensile strength, stiffness and resistance to fats and oils compared to traditional plastic materials; however, they require further improvement in some properties and characteristics such as viscosity, thermal stability and production cost [1]. The properties of PLA can be improved by blending with several other synthetic polymers (e.g., polystyrene, polyethylene or polypropylene) and biopolymers (e.g., thermoplastic starch, rubbers or poly (3-hydroxybutyrate)) to obtain novel biodegradable materials with lower cost and higher durability compared to the traditional plastic materials [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…PLA-based plastics have some unique features such as high tensile strength, stiffness and resistance to fats and oils compared to traditional plastic materials; however, they require further improvement in some properties and characteristics such as viscosity, thermal stability and production cost [1]. The properties of PLA can be improved by blending with several other synthetic polymers (e.g., polystyrene, polyethylene or polypropylene) and biopolymers (e.g., thermoplastic starch, rubbers or poly (3-hydroxybutyrate)) to obtain novel biodegradable materials with lower cost and higher durability compared to the traditional plastic materials [1,2]. However, extraction, purification and continuous supply of lactic acid as raw material from fermentation processes is a major challenge because of its highly hydrophilic structure and the lack of efficient low cost purification techniques [3].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

et al. 2017

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Solid-liquid extraction (adsorption or ion exchange) is a promising approach for the in situ separation of organic acids from fermentation broths. In this study, a diluted concentration of lactic acid (<10 g/L) separation from a model fermentation broth by granular activated carbon (GAC) as well as weak (Reillex ® 425 or RLX425) and strong (Amberlite ® IRA-400 or AMB400) base anion exchange resins under various operating conditions was experimentally investigated. Thermodynamic analysis showed that the best lactic acid adsorption performances were obtained at a pH below the pK a value of lactic acid (i.e., 3.86) for GAC and RLX425 by physical adsorption mechanism and above the pK a value for the AMB400 resin by an ion exchange mechanism, respectively. The adsorption capacity for GAC (38.2 mg/g) was the highest, followed by AMB400 (31.2 mg/g) and RLX425 (17.2 mg/g). As per the thermodynamic analysis, the lactic acid adsorbed onto GAC and RLX425 through a physical adsorption mechanism, whereas the lactic acid adsorbed onto AMB400 with an ion exchange mechanism. The Langmuir adsorption isotherm model (R 2 > 0.96) and the pseudo-second order kinetic model (R 2~1 ) fitted better to the experimental data than the other models tested. Postulating the conditions for the real fermentation broth (pH: 5.0-6.5 and temperature: 30-80 • C), the resin AMB400 represents an ideal candidate for the extraction of lactic acid during fermentation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

et al. 2017

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“…This polymer has good properties, such as: high flexibility, good processability, excellent resistance to dilute and concentrated acids, alcohols, bases and esters, impact resistance and dimensional stability. However, the use of this polymer causes serious environmental concerns because it is a bioinert polymer, which means that it is highly resistant to assimilation by microorganisms, such as fungi and bacteria [1,2] .…”

Section: Introductionmentioning

confidence: 99%

“…In this scenario, studies have been conducted in order to develop, at least, partially biodegradable plastics by blending the fossil-fuel-based conventional polymers with biodegradable polymers, such as starch or cellulose. There are evidences that the degradability of LDPE has been improved when native starch or thermoplastic starch is added to it, although the pure LDPE is not biodegradable [1][2][3][4] . Poly (3-hydroxybutyrate) (PHB) is aliphatic polyester produced by several microorganisms that presents very good mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Low Density Polyethylene (LDPE) blends based on Poly(3-Hydroxi-Butyrate) (PHB) and Guar Gum (GG) biodegradable polymers

Rocha

Moraes

2015

Polímeros

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SbstractLDPE blends based on PHB and GG biodegradable polymers were prepared by melt mixing in a twin screw extruder. The mechanical properties of the materials were evaluated. Preliminary information about the biodegradation behavior of the specimens was obtained by visual observation of samples removed from the simulated soil in 90 days. The results indicated that LDPE/PHB blends may be used for designing LDPE based materials with increased susceptibility to degradation, if elongation at break and impact properties are not determinant factors of their performance. LDPE based materials on GG present values of flexural and mechanical strength lower than those of LDPE/PHB blends. LDPE/PHB/GG blends exhibit unsatisfactory properties. Apparently, the effect of addition of GG to LDPE on the biodegradation behavior of LDPE/GG blends was less intense than the effect caused by addition of PHB to the blends. Similar observation has occurred with the partial replacement of GG by PHB in the ternary blends.

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“…Nevertheless, LDPE waste persists for thousands years after disposal causing a negative environmental impact. Therefore, the introduction of biodegradable polymers or natural fillers in LDPE based materials formulation may be considered as an alternative in the development of more ecofriendly material [15][16].…”

Section: Introductionmentioning

confidence: 99%

Studies on Morphological and Thermal Properties of Low Density Polyethylene/Maize Cob Ash Particulate Composite

Chira¹,

Anthony²,

Yawas³

et al. 2014

IOSRJEN

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-A major problem of reinforced composites is that the interfaces between the fiber and matrix become a limiting factor in improving mechanical properties. The effects of reinforcement on the thermal and morphological characteristics of the low density polyethylene/maize cob ash particulate composite are studied. Morphology of the maize cob ash by scanning electron microscope (SEM) with energy dispersive system (EDS), revealed that the maize ash particles were solid in nature but irregular in size. The EDS scan reveal that the microstructure for the maize cob ash consists of only carbon, silicon, oxygen, aluminium and calcium (C, Si, O, Al, Ca). The incorporation of the maize cob ash particles into the recycled low density polyethylene (RLDPE) matrix increased the thermal decomposition temperatures and the residual yields of RLDPE/MCSp composite, and this enhancing effect was more pronounced at higher heating rate. This result indicated that the presence of maize cob particles (MCSp) could lead to the stabilization of RLDPE, resulting in the enhancement of the thermal stability of RLDPE/MCSp composite.

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Melt Rheology of Poly(Lactic Acid)/Low Density Polyethylene Polymer Blends

Cited by 61 publications

References 24 publications

Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

Adsorption Behaviour of Lactic Acid on Granular Activated Carbon and Anionic Resins: Thermodynamics, Isotherms and Kinetic Studies

Low Density Polyethylene (LDPE) blends based on Poly(3-Hydroxi-Butyrate) (PHB) and Guar Gum (GG) biodegradable polymers

Studies on Morphological and Thermal Properties of Low Density Polyethylene/Maize Cob Ash Particulate Composite

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