Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid)

Valapa, Ravibabu; Hussain, Sameer; Iyer, Parameswar Krishnan; Pugazhenthi, G.; Katiyar, Vimal

doi:10.1007/s10965-015-0823-2

Cited by 29 publications

(10 citation statements)

References 52 publications

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“…On the contrary to above-mentioned publications, in PLA/lignin composites produced by Anwer et al [19] an increase in lignin content caused the shift of T c to higher temperature values. Also for PLA/-graphene composites, that relationship was noticed [12]. In terms of T m , the discrepancy between reference sample (177.5°C) and composites (173.9-175.3°C) was not very vast and consistent with other papers [21,49].…”

Section: Polarized Light Microscopy (Plm)supporting

confidence: 88%

“…Wang et al [11] proved that the addition of the multiamide, heterogeneous, nucleating agent to PLA can effectively improve both nucleation ability and thermal resistance of the polymer. Also graphene exhibits the nucleating ability in the PLA matrix [12] causing the reduction in the nucleation induction period. It is reflected in the enhanced thermal stability of polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

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Supermolecular structure and nucleation ability of polylactide-based composites with silica/lignin hybrid fillers

Grząbka-Zasadzińska

Kłapiszewski

Bula

et al. 2016

J Therm Anal Calorim

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In this paper, amorphous silica Syloid 244 and kraft lignin were mechanically coupled. Four hybrid materials containing silica and lignin in ratios 1:1, 2:1, 5:1 and 20:1 were prepared. As reference samples for hybrid fillers pristine silica and lignin were used. Particle size determination and microscopic observations were applied to determine dispersive and morphological properties of hybrid fillers. Fourier transform infrared spectroscopy confirmed the effective preparation of silica/lignin hybrid materials. The parameters of porous structure of examined hybrid filler were determined using the multipoint Brunauer-Emmett-Teller method and Barrett-Joyner-Halenda algorithm. Composite samples of polylactide (PLA) containing 2.5 % (w/w) of hybrid filler were extruded. Optical microscopy, wide-angle X-ray scattering and differential scanning calorimetry were applied to specify the supermolecular structure of functional PLA/hybrid composites and analyze the crystallization parameters as well as the phase transformation in PLA matrix. Silica/lignin hybrid material was found to be a filler capable of an effective crystal nucleation. The nucleating ability of silica/lignin hybrid filler in PLA matrix is related to porous properties of filler and its composition.

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Section: Polarized Light Microscopy (Plm)supporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Supermolecular structure and nucleation ability of polylactide-based composites with silica/lignin hybrid fillers

Grząbka-Zasadzińska

Kłapiszewski

Bula

et al. 2016

J Therm Anal Calorim

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“…The crystallized fraction (v%) gradually decreases from 23.9% for the pure PLA to 22.0% for one nano-carbon layer and to 10.2% for the 4 nano-carbon layers sandwiches. This confirms that graphene exhibits nucleation effect, 17 which leads to a decrease of the nucleus size by increasing the nano-carbon filler content in the sandwich structures. Double melting peak (T m ) was observed for the nano-carbon containing sandwich samples, which is associated with the presence of two materials.…”

Section: Thermal Propertiessupporting

confidence: 63%

Electromagnetic and thermal properties of three-dimensional printed multilayered nano-carbon/poly(lactic) acid structures

Paddubskaya

Valynets

Kuzhir

et al. 2016

Journal of Applied Physics

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A new type of lightweight material produced by 3D printing consisting of nano-carbon doped polymer layer followed by a dielectric polymer layer is proposed. We performed temperature dependent characterization and measured the electromagnetic (EM) response of the samples in the GHz and THz range. The temperature dependent structural characteristics, crystallization, and melting were observed to be strongly affected by the presence and the number of nano-carbon doped layers in the sandwich structure. The electromagnetic measurements show a great potential of such a type of periodic material for electromagnetic compatibility applications in microwave frequency range. Sandwich structures containing only two nano-carbon layers already become not transparent to the microwaves, giving an electromagnetic interference shielding efficiency at the level of 8-15 dB. A sandwich consisting of one nano-carbon doped and one polymer layer is opaque for THz radiation, because of 80% of absorption. These studies serve as a basis for design and realization of specific optimal geometries of meta-surface type with the 3D printing technique, in order to reach a high level of electromagnetic interference shielding performance for real world EM cloaking and EM ecology applications. V

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“…[9,10] Thus, it is necessary to improve the crystallization rate of PLA. So far, numerous researchers have mainly focused on blending PLA with a nucleating agent [11][12][13][14][15] or other flexible polymers, [16][17][18][19][20] which are effective ways to enhance the crystallization rate of PLA.…”

Section: Introductionmentioning

confidence: 99%

Effect of wood flour as nucleating agent on the isothermal crystallization of poly(lactic acid)

Zhang

2016

Polym. Adv. Technol.

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The effect of wood flour (WF) as an efficient nucleating agent on the isothermal melt crystallization and isothermal cold crystallization behavior of poly(lactic acid) (PLA) was investigated by differential scanning calorimeter and polarized optical microscopy. It was found that the incorporation of 4 wt% WF promoted the crystallization of PLA about 4.2%. Polarized optical microscopy results showed the Maltese cross of the samples. The presence of the 4 wt% WF may increase the nucleation density, leading to the increase of the spherulites; however, the size of the spherulites decreased, and the structure became incomplete. The Avrami model was applied to analyze the isothermal crystallization kinetics. It is concluded that the addition of WF modified the crystallization process of PLA (the value of Avrami exponent changed). Various parameters, such as the crystallization half time and crystallization rate constant, reflect that 4 wt% WF significantly improves the crystallization process. The observations in this article indicate that WF is an efficient nucleating agent of PLA. Copyright © 2016 John Wiley & Sons, Ltd.

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Influence of graphene on thermal degradation and crystallization kinetics behaviour of poly(lactic acid)

Cited by 29 publications

References 52 publications

Supermolecular structure and nucleation ability of polylactide-based composites with silica/lignin hybrid fillers

Supermolecular structure and nucleation ability of polylactide-based composites with silica/lignin hybrid fillers

Electromagnetic and thermal properties of three-dimensional printed multilayered nano-carbon/poly(lactic) acid structures

Effect of wood flour as nucleating agent on the isothermal crystallization of poly(lactic acid)

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