Morphology and Structure of Polymer Blends Containing Nanofillers

Nazockdast, Hossein

doi:10.1002/9783527653966.ch7

Cited by 15 publications

(15 citation statements)

References 171 publications

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“…Certain studies on polypropylene/organoclay nanocomposites have shown that the onset of the stress overshoot in startup of steady shear fl ow experiments depends on the applied shear strain rather than the time after the fl ow has been imposed. [ 17,19,80,81 ] These experiments have proven that the stress overshoot occurs at approximately the same absolute strain range of 1 to 3 γ ≈ regardless of the applied shear-rate indicating that the shear stress scales with strain. Such a characteristic behavior has also been observed in non-Brownian suspensions and liquid crystalline polymers.…”

Section: Orientation Process In the Unit Cellmentioning

confidence: 63%

“…This value is calculated only for polymer chains in the simulated nanocomposite models by hypothetically removing all silicate beads from the system. [ 17 ] The good correspondence with experiments ensures that the DPD results are in fact compared with solid experimental studies rather than only phenomenological models with unresolved coeffi cients. Therefore, by comparing DPD simulations with FT and SRF models the orientation patterns of DPD results are tested not only against accepted models but also against experimental data since the coeffi cients used in these models are very close to the experimental results.…”

Section: Macromolecular Theory and Simulationsmentioning

confidence: 90%

“…[ 15 ] These tensors are defi ned as the second and fourth moments of the orientation distribution function. The resulting model has been utilized to predict the fl ow-induced orientation of various anisometric particles including short fi bers, [ 5,16 ] layered silicates, [17][18][19] and carbon nanotubes. [ 20 ] Other authors have also investigated different approaches such as nonequilibrium thermodynamics in order to derive constitutive equations that could describe polymer nanocomposites with nanofi bers and nanosheets.…”

Section: Introductionmentioning

confidence: 99%

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Dissipative Particle Dynamics Models of Orientation of Weakly‐Interacting Anisometric Silicate Particles in Polymer Melts under Shear Flow: Comparison with the Standard Orientation Models

Gooneie

Schuschnigg

Holzer

2016

Macro Theory & Simulations

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Dissipative particle dynamics (DPD) models of orientation of weakly-interacting silicate particles in a polymer matrix are presented. To examine the DPD models, the evolution of orientation under shear fl ow is compared with the predictions of the standard orientation models, namely, the Folgar-Tucker (FT) and the strain reduction factor (SRF) models. While the orientation patterns are the same in all models, the slow orientation kinetics observed in previous experiments is only predicted in the DPD and SRF models. Since the coeffi cients of the SRF model are in good agreement with the experiments, the good tally between the DPD and SRF models supports the capability of DPD to successfully simulate the orientation process. The orientation in a large cell constructed from unit cells with various averaged initial orientation angles is evaluated from evolutions in the unit cells based on the affi ne deformation assumption. The good agreement between such calculations and SRF model predictions supports that the affi ne deformation assumption in the large cell is reasonable. It is argued that the nonaffi ne deformation originated from the particlebased nature of DPD models at the lower scale could be combined with the affi ne deformation at the upper scale to yield appropriate estimations of the orientation state.

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Section: Orientation Process In the Unit Cellmentioning

confidence: 63%

Section: Macromolecular Theory and Simulationsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Dissipative Particle Dynamics Models of Orientation of Weakly‐Interacting Anisometric Silicate Particles in Polymer Melts under Shear Flow: Comparison with the Standard Orientation Models

Gooneie

Schuschnigg

Holzer

2016

Macro Theory & Simulations

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“…It has been well recognized that the addition of nanoparticles can have an appreciable effect on the morphological development of multiphase polymeric material [27]. The results of similar experiment performed on SEBS G1657, SEBS G1652 and SEBS 1537 nanocomposites containing different MWCNT loadings are shown in Fig.…”

Section: Melt State Rheological Behaviormentioning

confidence: 73%

“…In this paper, rheological measurements, due to their great sensitivity to microstructural changes, has been used as the main efficient tool in probing microstructure development of BCP hybrids [27]. The information extracted from rheological measurements has been complemented by means of both small angle x-ray scattering spectra and transmission electron microscopy images.…”

Section: Introductionmentioning

confidence: 99%

Rheological characterization of nanostructured material based on Polystyrene-b-poly(ethylene-butylene)-b-polystyrene (SEBS) block copolymer: Effect of block copolymer composition and nanoparticle geometry

Hasanabadi

Nazockdast

Balog

et al. 2017

Composites Science and Technology

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Block copolymer (BCP) nanocomposite systems are of broad interest; however, reports on the role of nanoparticles on microphase separation behavior are rare. The goal of present study is to investigate the preparation of composite nanostructured materials containing Multi-Walled Carbon Nanotubes (MWCNTs) or graphene nanoplates. BCP nanocomposites based on the linear triblock copolymer, Polystyrene-b-poly(ethylene-butylene)-b-polystyrene (SEBS), with different morphological structure were prepared by melt mixing. The results of temperature sweep experiments showed an enhancing effect of both MWCNT and graphene nanosheets on increasing the microphase separation temperature as well as accelerating its kinetic, resulting from the confinement of BCP segments, with graphene nanosheets providing a more severely confined geometry for polystyrene segments in contrast to MWCNTs. Additionally, DMTA results indicated a promotion of the BCP microphase separation by incorporation of nanoparticles. Transient flow measurements followed by time sweep test suggested the existence of a special 3D network microstructure caused by nanoparticles/domain interactions.

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Microstructure effects on the rheology of nanoclay‐filled PHB/LDPE blends

et al. 2019

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The rheological and morphological properties of the nanoclay-filled LDPE/PHB blends using LDPE-g-MAH as compatibilizer were determined. SEM data showed that the morphology was more sensitive to organoclay incorporation, compared to inclusion of the compatibilizer. Moreover, the results of image analysis and rheological studies indicated that nanoclay was located in the PHB phase after migrating from the LDPE phase, due to the thermodynamic and viscosity effects. The data obtained also showed that the stabilization mechanisms of PHB and LDPE matrix nanocomposites is due to coalescence prevention (due to the physical barrier) and alteration in the viscosity ratio of the phases, respectively. The obvious, pseudo-solid-like behavior over a wide range of frequencies in the PHB/LDPE/nanoclay systems demonstrated that the strong interaction between PHB/LDPE and nanoclay restricted the relaxation process of polymer chains. Therefore, PHB/LDPE/nanoclay was associated with a greater melt strength, which is essential for its favorable processability and applications. POLYM. COM-POS., 40:4125-4134, 2019.

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Morphology and Structure of Polymer Blends Containing Nanofillers

Cited by 15 publications

References 171 publications

Dissipative Particle Dynamics Models of Orientation of Weakly‐Interacting Anisometric Silicate Particles in Polymer Melts under Shear Flow: Comparison with the Standard Orientation Models

Dissipative Particle Dynamics Models of Orientation of Weakly‐Interacting Anisometric Silicate Particles in Polymer Melts under Shear Flow: Comparison with the Standard Orientation Models

Rheological characterization of nanostructured material based on Polystyrene-b-poly(ethylene-butylene)-b-polystyrene (SEBS) block copolymer: Effect of block copolymer composition and nanoparticle geometry

Microstructure effects on the rheology of nanoclay‐filled PHB/LDPE blends

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