Matrix tacticity controlled tuning of microstructure, constitutive behavior and rheological percolation effect of melt‐mixed amino‐functionalized MWCNT/PP nanocomposites

Das, Dibyendu; Sethy, Sucharita; Satapathy, Bhabani K.

doi:10.1002/pen.24674

Cited by 5 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was attributed to the internal networking structure of the filler, which will also be explained in the oscillatory shear experiment. The flow curve of the PLA/AGO samples could be fitted using the Carreau-Yasuda equation [ 48 , 49 ]:

where

and

are the shear viscosity of zero and infinite shear rate, respectively. λ [s] is the relaxation time; n is the dimensionless parameter (0 ≤ n < 1), and a is the parameter that depicts the transition zone from Newtonian to the shear-thinning region.…”

Section: Resultsmentioning

confidence: 99%

Melt Rheology and Mechanical Characteristics of Poly(Lactic Acid)/Alkylated Graphene Oxide Nanocomposites

et al. 2020

View full text Add to dashboard Cite

Poly(lactic acid) (PLA) nanocomposites were synthesized by a solution blending and coagulation method using alkylated graphene oxide (AGO) as a reinforcing agent. Turbiscan confirmed that the alkylation of GO led to enhanced compatibility between the matrix and the filler. The improved dispersity of the filler resulted in superior interfacial adhesion between the PLA chains and AGO basal plane, leading to enhanced mechanical and rheological properties compared to neat PLA. The tensile strength and elongation at break, i.e., ductility, increased by 38% and 42%, respectively, at the same filler content nanocomposite (PLA/AGO 1 wt %) compared to nonfiller PLA. Rheological analysis of the nanocomposites in the molten state of the samples was performed to understand the filler network formed inside the matrix. The storage modulus increased significantly from PLA/AGO 0.5 wt % (9.6 Pa) to PLA/AGO 1.0 wt % (908 Pa). This indicates a percolation threshold between the two filler contents. A steady shear test was performed to examine the melt flow characteristics of PLA/AGO nanocomposites at 170 °C, and the viscosity was predicted using the Carreau−Yasuda model.

show abstract

where

and

Section: Resultsmentioning

confidence: 99%

Melt Rheology and Mechanical Characteristics of Poly(Lactic Acid)/Alkylated Graphene Oxide Nanocomposites

et al. 2020

View full text Add to dashboard Cite

show abstract

“…17,18,22 Hence, model simulation of the rheological response of nanocomposites can offer us an outline for the description/prediction of their properties as a function of process and material parameters. [23][24][25][26][27] Experimental results of polymer nanocomposites' viscoelasticity display a substantial improvement in the glassy state (elasticity plateau modulus) with increasing the nanofiller loading. Additionally, under certain conditions, a level of the storage modulus, that is, a weak frequency dependence, was detected at very low frequencies, revealing a solid-like behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the rheology of polymer nanocomposites has attracted important attention 17,18,22 . Hence, model simulation of the rheological response of nanocomposites can offer us an outline for the description/prediction of their properties as a function of process and material parameters 23–27 …”

Section: Introductionmentioning

confidence: 99%

Study of the matrix–particle interactions of polymer nanocomposites in the low‐frequency regime

Kontou

2024

Polymer Composites

View full text Add to dashboard Cite

In this study, the dynamic moduli, in a wide frequency scale, of two series of polymer nanocomposites were qualitatively discussed. The dynamic mechanical analysis experimental results of polylactic acid (PLA)/silica nanocomposites, as well as PLA/graphene oxide‐carbon nanotubes hybrid nanocomposites, were employed. The study has been focused on the low‐frequency regime, estimating the terminal incline of the storage and loss modulus. In addition, the relative position of the two dynamic moduli was examined and results about the nanofiller's dispersion quality, as well as their interaction with the matrix were extracted. The consequence of nanofiller kind, loading, and distribution quality on the mechanical enhancement was thoroughly studied. In addition, the storage modulus master curves could be simulated by a model from the literature, considering the topological constraints of an entangled polymer reinforced by nanoparticles. It was shown that by adopting the linear contribution of the free and adsorbed chains to the relaxation function, the details of the master curves could be captured in the entire frequency range, quite effectively. The estimated model parameter values confirmed the analysis of the matrix–particle interactions.Highlights The SiO2 size effect on the terminal zone slope of the dynamic moduli. Successful description of the dynamic moduli by the tube reptation concept. Analysis of the physical meaning of the model parameter values. Relation between SiO2 dispersion quality and molecular motion restriction. Matrix‐particle interactions is the governing mechanism of enhancement.

show abstract

“…[ 5–10 ] Subsequently, CNTs based PP composites were developed and reported, wherein single‐wall carbon nanotubes (SWCNTs) or multiwall carbon nanotubes (MWCNTs) were introduced during melt‐mixing. [ 11–22 ]…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon nanotube type and novel modification on dispersion, melt‐rheology and electrical conductivity of polypropylene/carbon nanotube composites

et al. 2020

View full text Add to dashboard Cite

Melt‐mixing was employed to prepare multiwall carbon nanotubes (MWCNTs) based polypropylene (PP) composites, wherein MWCNTs vary in “agglomerate” size and also in terms of “agglomerate” structure. Morphological analysis revealed MWCNTs‐D type exhibits bigger “agglomerate” size with compact “agglomerate” structure with respect to MWCNTs‐N type, that show smaller “agglomerate” size with porous “agglomerate” structure in the corresponding PP/MWCNTs composites. Melt‐rheological analysis showed a rheological percolation threshold of 2 to 3 wt% in PP/MWCNTs‐N composites, whereas PP/MWCNTs‐D composites exhibited a rheological percolation of 3 to 4 wt% of MWCNTs. AC electrical conductivity measurements exhibited an electrical percolation threshold of 0.5 to 1 wt% of MWCNTs‐N, whereas MWCNTs‐D type depicts an electrical percolation threshold of 2 to 3 wt% of MWCNTs in the respective composites. Further, an unique dispersant; Li salt of 6‐aminohexanoic acid (Li‐AHA) was utilized to “deagglomerate” MWCNTs. Moreover, PP‐g‐MA was also utilized in combination with Li‐AHA encapsulated MWCNTs in the corresponding composites. An extensive morphological, rheological, and electrical conductivity measurements suggested the influence of Li‐AHA encapsulated MWCNTs and PP‐g‐MA on the transformation of MWCNTs “agglomerate” into “individualized” and smaller MWCNTs “agglomerate” in PP/MWCNTs composites.

show abstract

Matrix tacticity controlled tuning of microstructure, constitutive behavior and rheological percolation effect of melt‐mixed amino‐functionalized MWCNT/PP nanocomposites

Cited by 5 publications

References 36 publications

Melt Rheology and Mechanical Characteristics of Poly(Lactic Acid)/Alkylated Graphene Oxide Nanocomposites

Melt Rheology and Mechanical Characteristics of Poly(Lactic Acid)/Alkylated Graphene Oxide Nanocomposites

Study of the matrix–particle interactions of polymer nanocomposites in the low‐frequency regime

Influence of carbon nanotube type and novel modification on dispersion, melt‐rheology and electrical conductivity of polypropylene/carbon nanotube composites

Contact Info

Product

Resources

About