Preparation of polylactide/graphene composites from liquid-phase exfoliated graphite sheets

Li, Xianye; Xiao, Yinghong; Bergeret, Anne; Longerey, Marc; Che, Jianfei

doi:10.1002/pc.22673

Cited by 73 publications

(55 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison, Chartarrayawadee et al observed an increase of 32% in tensile strength with the incorporation of 1 wt% graphene oxide and stearic acid (1:1 ratio) in PLA. Also, Li et al reported an increase in tensile strength of 39% with the incorporation of 1 wt% graphene sheets in PLA. On the other hand, Narimissa et al observed PLA/GNP‐M 1 wt% composites to have similar tensile strength and Young's modulus as pristine PLA, becoming brittle at 3 wt% loading.…”

Section: Resultsmentioning

confidence: 99%

“…In our recent study, graphene nanoplatelets with smaller size (GNP‐C) revealed to be biocompatible with human fibroblasts (HFF‐1) until a concentration of 50 μg mL −1 , opposing to larger GNP‐M, which are toxic above 20 μg mL −1 . Since several authors have shown that effective reinforcement of polymeric matrices can be obtained with small loadings of GBM , toxic concentrations achievement can be prevented. Additionally, graphene oxide (GO) and graphene nanoplatelets (GNP), grade M (GNP‐M), have shown not to affect mouse embryo fibroblasts metabolic activity when incorporated in PLA at a loading of 0.4 wt% .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets

Gonçalves¹,

Pinto

Machado

et al. 2016

Polymer Composites

View full text Add to dashboard Cite

A recently made available form of graphene nanoplate-lets (GNP-C) is investigated for the first time as reinforcement filler for PLA. GNP-C, with thickness of about 2 nm and length 1-2 m, was incorporated at different loadings (0.1-0.5 wt%) in poly(lactic acid) (PLA) by melt blending. The effect of varying mixing time and mixing intensity was studied and the best conditions were identified, corresponding to mixing for 20 min at 50 rpm and 180 º C. Thermal analysis (differential scanning calorimetry and thermogravimetric analysis) indicated no relevant differences between pristine PLA and the composites. However, the rate of thermal degradation increased with loading, due to the dominant effect of heat transfer enhancement over mass transfer hindrance. Raman spectroscopy allowed confirming that increasing graphene loading or decreasing mixing time translates into higher nanoplatelet agglomeration, in agreement with the observed mechanical performance and scanning electron microscopy imaging of the composites. The composites exhibited maximum mechanical performance at a loading of 0.25 wt%: 20% increase in tensile 2 strength, 12% increase in Young's modulus, and 16% increase in toughness. The incorporation of 0.25 wt% GNP-C did not affect human fibroblasts (HFF-1) metabolic activity or morphology.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets

Gonçalves¹,

Pinto

Machado

et al. 2016

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Table 1 compares the mechanical properties of the PLGA composite fibers with PLGA-based nanocarbon composites in previously published reports (in the form of either films or fibers). The ultimate strength, reported here, was much higher than those reported for PLGA composite with solvent exfoliated graphene [73] , graphene oxide [41][42][43][44][45][46] , graphene nanoplatelet [41,74] , carbon nanotubes [75] and carbon nanofibers [76] . Our average modulus was also considerably higher than all of them.…”

Section: Wet-spinning Of Graphene-plga Biomimetic Fibersmentioning

confidence: 58%

High‐Performance Multifunctional Graphene‐PLGA Fibers: Toward Biomimetic and Conducting 3D Scaffolds

Esrafilzadeh

Jalili

Stewart

et al. 2016

Adv Funct Materials

View full text Add to dashboard Cite

The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, it is demonstrated that with the aid of rheological insights, optimized formulations of graphene containing spinnable poly(lactic-co-glycolic acid) (PLGA) dopes can be made possible. This helps extend the general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solutionprocessed graphene into the design process and practical fiber architectural engineering. The as-produced fibers are found to exhibit excellent electrical conductivity and electrochemical performance, good mechanical properties, and cellular affinity. At the highest loading of graphene (24.3 wt%), the conductivity of as-prepared fibers is as high as 150 S m-1 (more than two orders of magnitude higher than the highest conductivity achieved for any type of nanocarbon-PLGA composite fibers) reported previously. Moreover, the Young's modulus and tensile strength of the base fiber are enhanced 647-and 59-folds, respectively, through addition of graphene. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsEsrafilzadeh, D., Jalili, R., Stewart, E. M., Aboutalebi, S. H., Razal, J. M., Moulton, S. The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, we demonstrate that with the aid of rheological insights, optimized formulations of graphene 2 containing spinnable Poly Lactic-co-Glycolic Acid (PLGA) dopes can be made possible. This helps us extend our general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solution-processed graphene into the design process and practical fiber architectural engineering. The asproduced fibers were found to exhibit excellent electrical conductivity, and electrochemical performance, good mechanical properties, and cellular affinity. At the highest loading of graphene (24.3 wt. %), the conductivity of as-prepared fibers was as high as 150 S m −1 (more than 2 orders of magnitude higher than the highest conductivity achieved for any type of nanocarbon-PLGA composite fibers) reported previously. Moreover, the Young's modulus and tensile strength of the base fiber were enhanced 647-and 59-folds, respectively, through addition of graphene.

show abstract

“…Generally, the incorporation of xGnP into p-PLA is to enhance thermal stability by acting as a superior insulator and mass transport barrier to the volatile products generated during decomposition. Many researchers also have demonstrated that the incorporation of graphenes could enhance the thermal stability of PLA at extremely low loading contents [30,31]. The TG and DTG thermograms of p-PLA and p-PLA nanocomposites are given in Figure 5.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

The Mechanical, Thermal and Morphological Properties of Graphene Nanoplatelets Filled Poly(lactic acid)/Epoxidized Palm Oil Blends

et al. 2014

View full text Add to dashboard Cite

Poly(lactic acid) (PLA)-based nanocomposites filled with graphene nanoplatelets (xGnP) that contains epoxidized palm oil (EPO) as plasticizer were prepared by melt blending method. PLA was first plasticized by EPO to improve its flexibility and thereby overcome its problem of brittleness. Then, xGnP was incoporated into plasticized PLA to enhance its mechanical properties. Plasticized and nanofilled PLA nanocomposites (PLA/EPO/xGnP) showed improvement in the elongation at break by 3322% and 61% compared to pristine PLA and PLA/EPO, respectively. The use of EPO and xGnP increases the mobility of the polymeric chains, thereby improving the flexibility and plastic deformation of PLA. The nanocomposites also resulted in an increase of up to 26.5% in the tensile strength compared with PLA/EPO blend. XRD pattern showed the presence of peak around 26.5° in PLA/EPO/xGnP nanocomposites which corresponds to characteristic peak of graphene nanoplatelets. Plasticized PLA reinforced with xGnP showed that increasing the xGnP content triggers a substantial increase in thermal stability. Crystallinity of the nanocomposites as well as cold crystallization and melting temperature did not show any significant changes upon addition of xGnP. However, there was a significant decrease of glass transition temperature up to 0.3wt% of xGnP incorporation. The TEM micrograph of PLA/EPO/xGnP shows that the xGnP was uniformly dispersed in the PLA matrix and no obvious aggregation was observed.Poly(lactic acid) (PLA) is an attractive candidate for replacing petrochemical polymer because it is biodegradable and produced from renewable resources. Suppliers claim that by using the right additives, PLA performances can be made comparable to those of polystyrene (PS), poly(ethylene terephthalate) (PET), polyethylene (PE), poly(vinyl chloride) (PVC), etc. and it can replace these or other non-biodegradable resins in many applications.PLA is characterized by excellent optical properties and high tensile strength but unfortunately, it is rigid and brittle. There is a general interest to formulate new grades of PLA with improved flexibility, ductility, and higher impact properties, while the tensile strength performances are maintained at the optimal level due to the current limitation required by a few applications such as packaging. A large number of investigations have been made to improve PLA properties via plasticization but due to several variables being involved such as nature of PLA matrix, type, and optimal percentage of plasticizer, thermal stability at the processing temperature, etc., unfortunate poor mechanical properties and/or the relationship between the thermo-mechanical properties and molecular parameters have not been considered enough. Plasticizers such as, citrate esters [1-3], citrate oligomers [4], triacetine [2, 5], glycerol [6], oligomeric malonate esteramides [7, 8], glucosemonoesters [9], and oligomeric lactic acid (OLA) [6], epoxidized palm oils [10, 11], poly(1,3-butylene adipate) [12], poly(ethylene glycol) [3,6,9,13,14], ...

show abstract

Preparation of polylactide/graphene composites from liquid-phase exfoliated graphite sheets

Cited by 73 publications

References 46 publications

Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets

Biocompatible reinforcement of poly(Lactic acid) with graphene nanoplatelets

High‐Performance Multifunctional Graphene‐PLGA Fibers: Toward Biomimetic and Conducting 3D Scaffolds

The Mechanical, Thermal and Morphological Properties of Graphene Nanoplatelets Filled Poly(lactic acid)/Epoxidized Palm Oil Blends

Contact Info

Product

Resources

About