Graphene nanoplatelets dispersion in poly(l-lactic acid): preparation method and its influence on electrical, crystallinity and thermomechanical properties

Lashgari, Soheila; Karrabi, Mohammad; Ghasemi, Ismaeil; Azizi, Hamed; Messori, Massimo

doi:10.1007/s13726-015-0413-5

Cited by 15 publications

(5 citation statements)

References 25 publications

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“…This hinders the growth of the molecular chain towards orderly direction. However, there is a smaller melting peak at 142.9°C besides the melting peaks around 152.8°C suggesting that the GO‐NH 2 /EDA acts as a crystal nucleus in the matrix to form heterogeneous nucleation similar to prior reports .…”

Section: Resultssupporting

confidence: 82%

Thermal stability and mechanical properties of ethylenediamine‐modified GO/co‐polyamide nanocomposites

et al. 2018

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We describe ethylenediamine‐modified graphene oxide (GO)/co‐polyamide (GO‐EDA/CO‐PA) nanocomposites prepared via solution blending with EDA‐modified GO (GO‐NH2/EDA). GO was prepared via the improved Hummers method, and EDA was used to modify the GO to add amine groups to graphene. X‐ray diffraction, Fourier‐transform infrared spectroscopy and atomic force microscope analysis showed that the thickness of GO‐NH2/EDA was 1.2 nm. Amino functional groups were introduced onto the GO sheets. Due to the steric hindrance effect of the amino on modified graphene as well as the strong, specific interactions between aminos and carboxyls on CO‐PA, the GO‐NH2/EDA filler was homogeneously dispersed in the matrix, and the interface reaction was effectively improved. The GO‐NH2/EDA could change the crystal structure of pure nylon and the glass transition temperature (Tg). The mechanical properties of the nanocomposites increased dramatically when the GO‐NH2/EDA content is 0.6 wt%. The tensile strength and yield strength of the nanocomposites increased by 50.3 and 134.8%, respectively. The effects of interfacial interaction, increased crystallization, and prevention of agglomeration of GO‐NH2/EDA improved the thermal properties of the GO‐EDA/CO‐PA nanocomposites. This is because the 50% thermal degradation temperature (T‐50%) and the thermal degradation temperature (Td,max) of the nanocomposites increased by 16 and 15°C when the GO‐NH2/EDA content is 0.8 wt%. The nano‐filler improves the thermal diffusivity of the nylon matrix at low temperature. POLYM. COMPOS., 40:3315–3324, 2019. © 2018 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 82%

Thermal stability and mechanical properties of ethylenediamine‐modified GO/co‐polyamide nanocomposites

et al. 2018

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“…The degree of crystallinity ( χ c ), was determined according to the equation:

χ_{normalc} (%) = \frac{∆ H_{normalm} - ∆ H_{cc}}{∆ H_{normalm}^{0} \times (1 - \emptyset_{normalf})} \times 100

where

∆ H_{normalm}

represents the melting enthalpy,

∆ H_{cc}

the cold crystallization enthalpy,

∆ H_{normalm}^{0}

the melting enthalpy of 100% crystalline PLA (93 J g −1 ) and

\emptyset_{normalf}

the weight percentage of the filler. [ 27 ] Since during the dynamic scan, the recrystallization (cold crystallization) of PLA above T g is inevitable, it is necessary to subtract this heat of crystallization from the total heat of melting, to obtain the crystallinity of PLA as it was cooled from the melt. [ 28 ] The equation must be further modified for reinforced‐composites by correcting it with the weight fraction of the filler content.…”

Section: Methodsmentioning

confidence: 99%

Poly(lactic acid) composites with few layer graphene produced by noncovalent chemistry

et al. 2022

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In recent years, significant attention has been given to "green" product innovation and related manufacturing processes. This work reports the preparation of few-layer graphene (FLG) and respective PLA-based composites by an ecofriendly, efficient, and cost-effective approach. FLG was produced in a scaledup process, based on the noncovalent functionalization of a micronized graphite with a pyrene derivate (PY), in aqueous solution. The exfoliation degree, morphology, and thermal stability of the exfoliated material were evaluated. Then, the influence of the pristine graphite and FLG on the morphology, crystallinity, thermal and mechanical properties of PLA composites produced by melt mixing is reported for the first time. The composites prepared with the lowest loading of 0.05 wt% demonstrated suitability for further processing for potential applications where product safety is crucial, such as in biomedicine.

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“…ACCEPTED MANUSCRIPT 3 (GNps) are used in polymer nanocomposites due to its excellent mechanical, thermal and electrical properties and also because of its low density and high surface area [18][19][20][21][22]. However, according to tendency of GNps to agglomeration and weak interaction with polymeric matrix, several methods have been developed to obtain the efficient dispersion of GNps in matrix, which including surface modification and covalent functionalization [23,24].…”

Section: Mmentioning

confidence: 99%

Nanocomposites based on poly(l-lactide)/poly(ε-caprolactone) blends with triple-shape memory behavior: Effect of the incorporation of graphene nanoplatelets (GNps)

Molavi

Ghasemi

Messori

et al. 2017

Composites Science and Technology

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Graphene nanoplatelets dispersion in poly(l-lactic acid): preparation method and its influence on electrical, crystallinity and thermomechanical properties

Cited by 15 publications

References 25 publications

Thermal stability and mechanical properties of ethylenediamine‐modified GO/co‐polyamide nanocomposites

Thermal stability and mechanical properties of ethylenediamine‐modified GO/co‐polyamide nanocomposites

Poly(lactic acid) composites with few layer graphene produced by noncovalent chemistry

Nanocomposites based on poly(l-lactide)/poly(ε-caprolactone) blends with triple-shape memory behavior: Effect of the incorporation of graphene nanoplatelets (GNps)

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