Effect of graphene content on the properties of poly(lactic acid) nanocomposites

Valapa, Ravi Babu; Pugazhenthi, G.; Katiyar, Vimal

doi:10.1039/c4ra15669b

Cited by 122 publications

(105 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XRD analysis was carried out to evaluate the exfoliation state of graphene in the fabricated composites. A sharp diffraction peak is observed for GR at 26.52°, which corresponds to the (002) graphitic carbon structure . The XRD pattern (Figure ) shows a broad band at 2θ ∼ 16.7° for PLA‐M and diluted‐MB composites corresponding to the (110) and (200) planes of PLA .…”

Section: Resultsmentioning

confidence: 96%

“…Thus, the dispersion of reinforcements within the matrix is a crucial problem to resolve in order to improve the nanocomposite properties . Certain techniques like sonication and covalent grafting with some polymers were tested in different cases to improve the filler dispersion. An in situ polymerization approach was also applied for better reinforcement by a filler in a matrix for graphene oxide and functionalized carbon nanotubes .…”

Section: Introductionmentioning

confidence: 99%

“…Dispersion of graphene in a polymer matrix leads to imperfect nanocomposites because of lessened interfacial stability. However, nanocomposites based on exfoliated graphene were observed to have high tensile strength along with thermal stability, and the agglomeration of filler was noticed in both solution processing and melt extrusion . A uniform dispersion of exfoliated graphene is also a challenging task to complete in order to enhance the properties of the composites, especially at higher loading conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Chakraborty

Gupta

Pugazhenthi

et al. 2018

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

This work attempted to improve the dispersion of graphene by coating poly(lactic acid) pellets with a masterbatch before melt processing. An in situ polycondensation reaction of lactic acid oligomer was utilized to prepare the masterbatch (MB) of exfoliated graphene (GR). MB dispersed composites of poly(lactic acid) (PLA) were fabricated by melt extrusion of MB‐coated PLA. One normal coated composite without MB coating (PLA‐M‐0.2GR) was fabricated for comparing properties. X‐ray diffraction, Raman spectroscopy, and morphological studies revealed better compatibility, dispersion, and interaction of GR for the diluted‐MB composite compared to the normal coated composite. The thermal stability, crystallization properties, and mechanical properties of the composites were examined, and the effect of short PLA chains in diluted‐MB composites was observed. The melt rheology nature of the composites was examined. Cole–Cole plots and Han plots suggested a uniform distribution of graphene. The sample PLA‐MB‐0.05GR showed improved modulus and elongation at break. It also showed better dispersion of GR, comparable thermal stability, good miscibility, good chain mobility, and high activation energy. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46476.

show abstract

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Chakraborty

Gupta

Pugazhenthi

et al. 2018

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Further, the enhancement in the thermal stability can be attributed to the presence of LDH layers on the pristine polystyrene. LDH layers increase the diffusional resistance for degradation gases, volatile compounds, and transmission of heat, thereby resulting in the enhanced thermal stability of the nanocomposites …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Polystyrene (PS)/Modified Ni‐Al LDH Nanocomposite: Role of Composition, Modifier and Synthesis Route of Layered Double Hydroxides (LDH)

Arulmurugan

Manikandan

Pugazhenthi

2018

Macromolecular Symposia

View full text Add to dashboard Cite

Layered double hydroxides (LDH) are two‐dimensional nanostructured materials, which impart flame retardancy property and improvement in various properties on incorporation into the polymer matrix. In this study, Ni‐Al LDH with a molar ratio of 2:1 and 3:1 (2NiAl and 3NiAl) was prepared by co‐precipitation method and Ni‐Al LDH with a molar ratio of 2:1 (NiAl urea) was also synthesized by the urea hydrolysis method. As the d‐spacing of these as‐synthesized LDHs is very small (≈0.8 nm) as well as hydrophilic in nature, hence, the unmodified LDHs are unsuitable for polymer nanocomposite preparation. In order to enhance the d‐spacing of LDHs, a simple regeneration method was employed to organically modify LDHs using two anionic surfactants such as sodium dodecyl benzene sulfate (SDBS) and sodium dodecyl sulfate (SDS). The hydrophobic tail of these anionic surfactants replaced the nitrate ions present in the unmodified LDHs leading to higher d‐spacing value, which was evident from XRD analysis. The above prepared LDHs (3 wt%) were incorporated into PS matrix by the solvent blending method to make PS nanocomposites. The 003 peak of modified LDHs did not appear in the XRD pattern of PS nanocomposites due to the disorientation of LDH layers in the PS matrix that was confirmed by TEM analysis. The TGA results clearly demonstrated that the thermal stability of the PS nanocomposite samples was increased by 26, 22 and 22 °C (PS/2NiAl SDS, PS/3NiAl SDS, and PS/NiAl urea SDS) for SDS modified LDH fillers, while in the case of SDBS modified LDH fillers, the improvement was around 32 °C in comparison with PS, when 15% weight loss was taken as a reference. The degradation mechanism, thermal degradation kinetics, and integral procedural decomposition temperature (IPDT) for all the nanocomposite systems were also evaluated using Criado method, Coats‐Redfern method, and Doyle's method, respectively. The effect of dispersion of the modified LDH fillers into PS matrix was examined using melt rheological analysis.

show abstract

“…[3][4][5][6][7][8][9][10] The vast majority of the NA increases the crystallization rate only by improving the primary nucleation rate rather than the secondary nucleation rate, as a result, the spherulite growth rate (G) almost remains constant. 11 However, basing on the isomorphism, our previous reports 12, 13 have developed a totally new polymeric NA, poly(butylene succinate-co-butylene fumarate) (PBSF) for poly(butylene succinate) (PBS), which is a widely used biodegradable polymer in the industry.…”

mentioning

confidence: 99%

How to regulate the isothermal growth rate of polymer spherulite without changing its molecular composition?

Tang

Gao

et al. 2015

CrystEngComm

View full text Add to dashboard Cite

show abstract

Effect of graphene content on the properties of poly(lactic acid) nanocomposites

Abstract: Preparation of graphene reinforced poly(lactic acid) nanocompositesviasolution casting approach for packaging applications.

Cited by 122 publications

References 67 publications

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Facile dispersion of exfoliated graphene/PLA nanocomposites via in situ polycondensation with a melt extrusion process and its rheological studies

Synthesis and Characterization of Polystyrene (PS)/Modified Ni‐Al LDH Nanocomposite: Role of Composition, Modifier and Synthesis Route of Layered Double Hydroxides (LDH)

How to regulate the isothermal growth rate of polymer spherulite without changing its molecular composition?

Contact Info

Product

Resources

About