PLA nanocomposites: Effect of filler type on non-isothermal crystallization

Papageorgiou, George Z.; Achilias, Dimitris S.; Nanaki, Stavroula; Beslikas, Theodoros; Bikiaris, Dimitrios N.

doi:10.1016/j.tca.2010.08.004

Cited by 193 publications

(145 citation statements)

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“…At room temperature, the storage modulus shows not much difference between the neat PLA and PLA composites except the PLA composites with 5 wt% PCC. In others' research work [31,32], the addition of inorganic particle shows a huge increase of the storage modulus below the glass transition temperature. Again this result matches with the decreased tensile strength with the addition of PCC particles due to the weaker interfacial adhesion between fillers and the matrix.…”

Section: Mechanical Propertiesmentioning

confidence: 93%

Comparison of Precipitated Calcium Carbonate/Polylactic Acid and Halloysite/Polylactic Acid Nanocomposites

Shi

Zhang

Siligardi

et al. 2015

Journal of Nanomaterials

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PLA nanocomposites with stearate coated precipitated calcium carbonate (PCC) and halloysite natural nanotubes (HNT) were prepared by melt extrusion. The crystallization behavior, mechanical properties, thermal dynamical mechanical analysis (DMTA), and the morphology of the PCC/PLA, HNT/PLA, and HNT/PCC/PLA composites were discussed. Compared to halloysite nanotubes, PCC nanoparticles showed a better nucleating effect, which decreased both the glass transition and cold crystallization temperatures. The tensile performance of PLA composites showed that the addition of inorganic nanofillers increased Young's modulus but decreased tensile strength. More interestingly, PLA composites with PCC particles exhibited an effectively increased elongation at break with respect to pure PLA, while HNT/PLA showed a decreased ultimate deformation of composites. DMTA results indicated that PLA composites had a similar storage modulus at temperatures below the glass transition and the addition of nanofillers into PLA caused to shift to lower temperatures by about 3 ∘ C. The morphological analysis of fractures surface of PLA nanocomposites showed good dispersion of nanofillers, formation of microvoids, and larger plastic deformation of the PLA matrix when the PCC particles were added, while a strong aggregation was noticed in composites with HNT nanofillers, which has been attributed to a nonoptimal surface coating.

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Section: Mechanical Propertiesmentioning

confidence: 93%

Comparison of Precipitated Calcium Carbonate/Polylactic Acid and Halloysite/Polylactic Acid Nanocomposites

Shi

Zhang

Siligardi

et al. 2015

Journal of Nanomaterials

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“…5, Table 3). This behaviour contrasts with the important nucleation effect of different fillers in the crystallization of PLLA (Pinho et al, 2009;Papageorgiou et al, 2010;Dobreva et al, 2010a;Dobreva et al, 2010b). Heating from the amorphous condition (CR10F10 - Fig.…”

Section: Effects Of Mg In the Melting And Crystallization Behaviour Omentioning

confidence: 84%

Does magnesium compromise the high temperature processability of novel biodegradable and bioresorbables PLLA/Mg composites?

Cifuentes¹,

Benavente²,

González-Carrasco³

2014

REVMETAL

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This paper addresses the influence of magnesium on melting behaviour and thermal stability of novel bioresorbable PLLA/Mg composites as a way to investigate their processability by conventional techniques, which likely will require a melt process at high temperature to mould the material by using a compression, extrusion or injection stage. For this purpose, and to avoid any high temperature step before analysis, films of PLLA loaded with magnesium particles of different sizes and volume fraction were prepared by solvent casting. DSC, modulated DSC and thermogravimetry analysis demonstrate that although thermal stability of PLLA is reduced, the temperature window for processing the PLLA/Mg composites by conventional thermoplastic routes is wide enough. Moreover, magnesium particles do not alter the crystallization behaviour of the polymer from the melt, which allows further annealing treatments to optimize the crystallinity in terms of the required combination of mechanical properties and degradation rate. RESUMEN: ¿Compromete el magnesio la procesabilidad a elevada temperatura de nuevos materiales compuestos biodegradables y biorreabsorbibles de PLLA/Mg?.Este trabajo aborda la influencia de magnesio en el comportamiento a fusión y en la estabilidad térmica de nuevos compuestos de PLLA / Mg biorreabsorbibles como una forma de investigar su procesabilidad mediante técnicas convencionales, lo que probablemente requerirá una etapa en estado fundido a alta temperatura para moldear el material mediante el uso de una etapa de compresión, extrusión o inyección. Para este fin, los materiales de PLLA cargados con partículas de magnesio, de diferentes tamaños y fracción de volumen, se prepararon por la técnica de disolución y colada, evitando así el procesado a alta temperatura antes del análisis. El análisis mediante DSC, DSC modulada y termogravimetría demuestra que, aunque la estabilidad térmica de PLLA se reduce, el intervalo de temperatura para su procesado por rutas convencionales es suficientemente amplio. Además, las partículas de magnesio no alteran la cristalización del polímero a partir del fundido, lo que permitirá optimizar el grado de cristalinidad mediante tratamientos posteriores de recocido y conseguir así una adecuada combinación de propiedades mecánicas y velocidad de degradación.

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“…Because of its good mechanical properties, nontoxic to the human body and the environment, as well as versatile fabrication processes, PLLA has excellent potential for substitution of petroleum-based polymers. [1][2][3][4][5][6] However, some disadvantages such as relatively poor mechanical properties, slow degradation rate and slow crystallization rate have limited its wide practical application. Therefore, polymer blending and nanocomposite preparation have often been employed to modify the physical properties of PLLA in order to extend its practical application.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10][11] Polymers reinforced with nanosized fillers are promising candidates for various applications requiring lightweight, high-performance, and multifunctional materials. To date, pristine clays, 12 organically modified clays, 13,14 nanofibers, 15 whiskers, 16 or more recently carbonaceous fillers 3,17,18 have received much more attention. Among conventional nanofillers, both carbon nanotubes (CNTs) and graphene have exceptional electric transport, thermal and mechanical properties, which appear as excellent candidates to make advanced functional composite materials.…”

Section: Introductionmentioning

confidence: 99%

“…Given the dissimilar surface chemistry of carbonaceous fillers and polymer, several attempts have been conducted to modify the surface of carbonaceous fillers to improve their bonding to polymer. 23,24 One of these is an oxidative method utilizing strong acids, such as H 2 SO 4 and HNO 3 , by which hydroxyl and carboxylic acid moieties are created on nanofillers. 25,26 The silanization of functionalized nanotubes is another preferred method used to enhance the interfacial adhesion between nanotubes and the matrix.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of silanized low‐dimensional carbon nanofillers on mechanical, thermomechanical, and crystallization behaviors of poly(L‐lactic acid) composites—A comparative study

Shi

Shan

et al. 2013

J of Applied Polymer Sci

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Composites were investigated regarding the comparison of multi-walled carbon nanotubes (MWCNTs) with exfoliated graphene(EG) in poly(L-lactic acid) (PLLA) and the effect of silane-treated carbon nanofillers on properties of PLLA composites. Solution blending method was used to prepare PLLA composites at a filler content of 0.5 wt %. Fourier transform infrared spectroscopy and X-ray photoelectron spectra results indicated the attachment of silane molecules on the surface of these nanofillers. It was found that the addition of these nanofillers greatly enhanced the mechanical, thermomechanical, and crystallization behaviors of PLLA due to the heterogeneous nucleation effect. Moreover, the silane-treated fillers further enhanced the breaking elongation moderately (although the materials are still brittle), modulus and thermal property of the nanocomposites, without sacrificing the tensile strength, compared with the pristine nanocomposites. On the other hand, composites reinforced with MWCNTs and EG perform almost the same mechanical property. And EG outperformed MWCNTs in thermomechanical properties of composites when being used as the reinforcement of PLLA. Conversely, composites reinforced with MWCNTs showed better crystallization properties than those reinforced with EG. Interestingly, no significant changes were observed for the crystallization properties of PLLA composites when MWCNTs and EG had been treated by silane coupling agent.

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PLA nanocomposites: Effect of filler type on non-isothermal crystallization

Cited by 193 publications

References 50 publications

Comparison of Precipitated Calcium Carbonate/Polylactic Acid and Halloysite/Polylactic Acid Nanocomposites

Comparison of Precipitated Calcium Carbonate/Polylactic Acid and Halloysite/Polylactic Acid Nanocomposites

Does magnesium compromise the high temperature processability of novel biodegradable and bioresorbables PLLA/Mg composites?

Influence of silanized low‐dimensional carbon nanofillers on mechanical, thermomechanical, and crystallization behaviors of poly(L‐lactic acid) composites—A comparative study

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