PLA/sepiolite and PLA/calcium carbonate nanocomposites: A comparison study

Sabzi, Mohammad; Jiang, Long; Atai, Mohammad; Ghasemi, Ismaeil

doi:10.1002/app.38866

Cited by 37 publications

(36 citation statements)

References 46 publications

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“…For nonoriented fibers, we observe that there is practically no increase of modulus between 4wt% and 10wt%. Nevertheless, the increase of 84% observed for nanocomposite contained 10wt% of aligned fibers is quite successful, once in previous works using sepiolite, the maximum increase in modulus was around 20-30% at a weight fraction of 3-5%, which decreased at higher concentration [13][14][15][16]. These are the first results obtained with permanent magnets ( Fig.…”

Section: Anisotropic Mechanical and Thermal Properties Of M-sepiolitesupporting

confidence: 70%

“…For a disordered orientation, the modulus is given by [14,32]: . We could use E f =180 GPa for typical modulus of the sepiolite fiber [33] and f=25 for the inferior estimation of the shape factor (based on aspect ratiolength of 1 μm and the diameter of 40 nm for sepiolite).…”

Section: Anisotropic Mechanical and Thermal Properties Of M-sepiolitementioning

confidence: 99%

“…Using an ammoniumbased ionic surfactant with high affinity with the sepiolite they obtained 20% increase of Young modulus for 5wt% of fillers but no mechanical improvement without surfactant. In other matrices, like polylactic acid, the increase of mechanical performance was only obtained below 3wt% and almost disappeared at 5wt%, which was attributed to the poor dispersibility of sepiolite inside the matrix [14]. One major problem for the nanocomposites is to be able to perform a good dispersion, once above 2 or 3% the mechanical properties like the elongation at break can strongly decrease because of the formation of aggregates of nanofibers [15].…”

Section: Introductionmentioning

confidence: 97%

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Anisotropic reinforcement of epoxy-based nanocomposites with aligned magnetite–sepiolite hybrid nanofiller

Marins

Mija

et al. 2015

Composites Science and Technology

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Section: Anisotropic Mechanical and Thermal Properties Of M-sepiolitesupporting

confidence: 70%

Section: Anisotropic Mechanical and Thermal Properties Of M-sepiolitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Anisotropic reinforcement of epoxy-based nanocomposites with aligned magnetite–sepiolite hybrid nanofiller

Marins

Mija

et al. 2015

Composites Science and Technology

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“…While the polymer shows good processability, biocompatibility, and high modulus/strength, its gas barrier property, heat deflection temperature and impact resistance need to be improved to meet the requirements of performance-critical applications. Different nanoclay minerals, especially layered silicates, have been used in PLA with the aim of making such property improvements 2,3 . Graphene is another important nanomaterial that has been extensively studied as a functional additive for polymers.…”

Section: Introductionmentioning

confidence: 99%

Graphene Nanoplatelets as Rheology Modifiers for Polylactic Acid: Graphene Aspect-Ratio-Dependent Nonlinear Rheological Behavior

Sabzi

Jiang

Nikfarjam

2015

Ind. Eng. Chem. Res.

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Two types of graphene were used to make polylactic acid (PLA)-graphene nanocomposites with various concentrations of graphene through a solution casting method. Due to the differences in surface area, thickness, and aspect ratio between the two types of graphene, the graphenegraphene and graphene-polymer interactions were different in these two nanocomposites. As a result, the two types of graphene nanoplatelets assembled into different interconnected structures in the matrix. Steady state shear, stepwise small-amplitude oscillatory shear (SAOS) and largeamplitude oscillatory shear (LAOS), and frequency sweep tests immediately after the stepwise shear were used to determine and study the two different graphene aggregate structures. The disruption (under LAOS) and recovery (under SAOS) of the structures were monitored and the great disparities between the two types of graphene were ascribed to their structural roots. The formation of a percolated graphene network structure in the matrix significantly altered the structural evolution under the stepwise shear. This multi-step shear process was found to be a very sensitive tool to differentiate sample microstructures while traditional linear viscoelastic tests (i.e. SAOS) failed.

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“…Various kinds of fillers such as organo‐modified montmorillonite (OMMT), carbon nanotubes (CNTs), calcium carbonate, silica, and carbon fullerenes are used to enhance the thermomechanical properties of PLA. Although, OMMTs and carbon nanotubes worked well with PLA, the formers need special organic treatments to get exfoliated, while the latters are expensive and are detrimental to the environment.…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)/(styrene‐ethylene‐butylene‐styrene)‐g‐maleic anhydride copolymer/sepiolite nanocomposites: Investigation of thermo‐mechanical and morphological properties

Nehra

Maiti

Jacob

2017

Polymers for Advanced Techs

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In this study, sepiolite nanoclay is used as reinforcing agent for poly(lactic acid) (PLA)/(styreneethylene-butylene-styrene)-g-maleic anhydride copolymer (SEBS-g-MA) 90/10 (w/w) blend.Effects of sepiolite on thermal behavior, morphology, and thermomechanical properties of PLA/SEBS-g-MA blend were investigated. Differential scanning calorimetry results showed 7% improvement in crystallinity at 0.5 wt% of sepiolite. The nanocomposite exhibited approximately 36% increase in the tensile modulus and 17% increase in toughness as compared with the blend matrix at 0.5 and 2.5 wt% of sepiolite respectively. Field emission scanning electron microscopy and transmission electron microscopy images exhibited sepiolite-induced morphological changes and dispersion of sepiolite in both PLA and SEBS-g-MA phases. Dynamic mechanical analysis and wide angle X-ray diffraction present evidences in support of the reinforcing nature of sepiolite and phase interaction between the filler and the matrix. This study confirms that sepiolite can improve tensile modulus and toughness of PLA/SEBS-g-MA blend. Biobased polymers have received a great deal of attention because they minimize the use of petrochemical resources and are superior in eco-friendliness. 1 The poly(lactic acid) (PLA) is a biodegradable polyester with high tensile strength and modulus. However, because of its brittleness, low thermal stability, and tensile toughness, neat PLA is limited in applications. Properly modified PLA can be used in many applications like food packaging, textile, electronics, surgical sutures, drug delivery systems, and transport and building. [2][3][4][5] Techniques such as plasticization, copolymerization, and blending are used to deal with the drawbacks of PLA. Blending is a feasible option compared with other techniques because of its cost effectiveness and minimum trade-off in properties. Blending with a thermoplastic elastomer like SEBS can be an effective way to toughen PLA. The SEBS is widely used in commercial applications such as sealants, footwear, coatings, 6 automotive parts, adhesives, temperature sensors, 7 and wire insulation. Sangeetha et al 8 reported that impact strength was higher in PLA/SEBS-g-MA blends than that in PLA/SEBS, which may be due to the interaction between maleic anhydride groups in SEBS-g-MA and carbonyl groups of PLA. SEBS-g-MA copolymer is used to toughen many polymers such as polypropylene (PP), 9 high density polyethylene, 10 nylon-6, 11 nylon-6,6 12 and PLA. 8,[13][14][15] reported that SEBS-g-MA is an effective impact modifier for PP/PLA blends. However, tensile modulus and strength decreased.Various kinds of fillers such as organo-modified montmorillonite (OMMT), [16][17][18][19] carbon nanotubes (CNTs), 20-22 calcium carbonate, [23][24][25] silica, 26-28 and carbon fullerenes 29,30 are used to enhance the thermomechanical properties of PLA. Although, OMMTs and carbon nanotubes worked well with PLA, the formers need special organic treatments to get exfoliated, while the latters are expensive and are detrimen...

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PLA/sepiolite and PLA/calcium carbonate nanocomposites: A comparison study

Cited by 37 publications

References 46 publications

Anisotropic reinforcement of epoxy-based nanocomposites with aligned magnetite–sepiolite hybrid nanofiller

Anisotropic reinforcement of epoxy-based nanocomposites with aligned magnetite–sepiolite hybrid nanofiller

Graphene Nanoplatelets as Rheology Modifiers for Polylactic Acid: Graphene Aspect-Ratio-Dependent Nonlinear Rheological Behavior

Poly(lactic acid)/(styrene‐ethylene‐butylene‐styrene)‐g‐maleic anhydride copolymer/sepiolite nanocomposites: Investigation of thermo‐mechanical and morphological properties

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