Effects of mixing protocol and mixing time on viscoelasticity of compatibilized PP/PS blends

Salehiyan, Reza; Choi, Woo Jin; Lee, Jun Hyup; Hyun, Kyu

doi:10.1007/s13367-014-0035-z

Cited by 24 publications

(15 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1c). This phenomenon is believed to be due to interfacial slip effects (Utracki, 1991;Zhao and Macosko, 2002;Salehiyan et al, 2014b). Lower entanglement densities at interfacial areas in such cases bring about slippage, which leads to moduli values lower than those of virgin polymers.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear behavior of PP/PS blends with and without clay under large amplitude oscillatory shear (LAOS) flow

Salehiyan

Song

Hyun

2015

Korea-Aust. Rheol. J.

Self Cite

View full text Add to dashboard Cite

Dynamic oscillatory measurement, i.e., small amplitude oscillatory shear (SAOS) and large amplitude oscillatory shear (LAOS) test was used to investigate linear and non-linear viscoelastic properties of Polypropylene (PP)/Polystyrene (PS) blends with and without 5 wt.% clay (C20A). Fourier transform (FTRheology), Lissajous curves and stress decomposition methods were used to analyze non-linear responses under LAOS flow. Composition effects of blends were investigated prior to compatibilization effects. Elevated concentrations of dispersed phase (PS) increased the moduli G'(ω) from SAOS test and G*(γ 0 ) from LAOS test of the blends as well as strain thinning behavior. Interestingly, addition of 5 wt.% clay (C20A) boosted moduli of the blends as well as led to similar strain thinning behaviors among the PP/PS/C20A blends, except for the (90/10) PP/PS blend. The latter did not show improved rheological properties despite morphological improvements, as shown by SEM. Results from SEM and improved rheological properties of PP/PS/C20A blends revealed the compatibilization effects of clay (C20A) particles regardless of size reduction mechanisms. Third relative intensities (I 3/1 ) from FT-rheology were found to be sensitive to clay (C20A) additions for the (70/30) and (30/70) PP/PS blends. Similarly, Lissajous curves could detect changes upon clay (C20A) addition, specifically at lower strain amplitudes whereupon addition of 5 wt.% clay resulted in the closed loops of Lissajous curves showing a more ellipsoidal shape due to increased elasticity in the blends. However, detection of these changes at larger strain amplitudes was more challenging. Therefore, stress decomposition (SD) method was applied for more precise characterization as it decomposes the total stress (σ) into elastic stress (σ') and viscous stress (σ''). Using SD method, elastic stress was more distorted, especially, strain hardening, while the total stress response remained almost unchanged at larger strain amplitudes.

show abstract

Section: Resultsmentioning

confidence: 99%

“…are known to alter morphologies and rheological properties (Halimatudahliana et al, 2002;Salehiyan et al, 2014a;Salehiyan et al, 2014b). Stabilized morphologies and finer droplet dispersions can be obtained when coalescence is hindered and interfacial tension is reduced by addition of compatibilizers.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear behavior of PP/PS blends with and without clay under large amplitude oscillatory shear (LAOS) flow

Salehiyan

Song

Hyun

2015

Korea-Aust. Rheol. J.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Changing the sequence of mixing of polymer pairs in blending can vary the final localization of the nanoparticles within an immiscible polymer blend. [14,[53][54][55][56][57][58][59] Given that enough stress is supplied for the affine motion of the nanoparticles in a molten polymer and the fact that requisite wetting parameters exist for (2, 5, 10, and 20 min). Sheets were peeled off after quenching.…”

Section: Mixing Protocol (Or Sequence)mentioning

confidence: 99%

“…iv) Premixing with a component that is thermodynamically not preferred. [59] Depending on the sought properties and end-use applications, nanoparticles of different shapes have been incorporated to the immiscible polymer blends. In this section, the effect of the mixing sequence on the final localization of most extensively used conducting nanoparticles, namely carbon black, CNTs, and graphene, will be discussed.…”

Section: Mixing Protocol (Or Sequence)mentioning

confidence: 99%

Tuning the Conductivity of Nanocomposites through Nanoparticle Migration and Interface Crossing in Immiscible Polymer Blends: A Review on Fundamental Understanding

Salehiyan

Ray

2018

Macro Materials & Eng

Self Cite

View full text Add to dashboard Cite

This article critically reviews the detailed fundamental understanding of the influence of conductive nanoparticle migration on the localization, and hence, electrical conductivity of immiscible polymer blend nanocomposites. Three types of conductive nanoparticles, namely, spherical, tubular, and platelet, are discussed with respect to their migration and electrical conductivity of obtained nanocomposites. A complete migration process consists of bulk migration within one component, contact with the interface, and penetration to the other component. During processing, the wetting coefficient parameter is the main thermodynamically controlling factor for nanoparticle localization. However, kinetic effects, such as mixing sequence and intensity, viscosity ratio, size and shape of the nanoparticles, and mixing time, can play a substantial role in determining the final locations of nanoparticles. Moreover, the rate of migration varies with the surface chemistry of the nanoparticles. It has been reported that nanoparticles in a more viscous phase move slower compared with a low viscous phase. Furthermore, nanoparticles having high aspect ratios and surface polarities compatible with the other component migrating faster. It is established that immiscible polymer blend nanocomposites with a “double percolation” structure having higher conductivity with nanoparticles are localized at the interface of the co‐continuous blends.

show abstract

“…Mixing is one of the essential unit operations that determines the performance of a chemical engineering process in polymer blending, food processing, and lab‐on‐a‐chip systems for chemical or biomedical applications . Although efficient mixing is easily achieved via turbulent mixing in macroscale processes, it is unsuitable for microscale mixing devices or in mixing operations with a highly viscous fluid where the fluid flow belongs to the Stokes flow regime.…”

Section: Introductionmentioning

confidence: 99%

Chaotic mixing in a barrier‐embedded partitioned pipe mixer

et al. 2017

View full text Add to dashboard Cite

Inspired by the partitioned pipe mixer (PPM), a barrier‐embedded partitioned pipe mixer (BPPM) is designed and analyzed using a numerical simulation scheme. The BPPM is a static mixer, composed of orthogonally connected rectangular plates with a pair of barriers, which divide, stretch, and fold fluid elements, leading to chaotic mixing via the baker's transformation. The aspect ratio of the plate (α) and the dimensionless height of the barrier (β) are chosen as design parameters to conduct a parameter study on the mixing performance. The flow characteristics and mixing performance are analyzed using the cross‐sectional velocity vectors, Poincaré section, interface tracking, and the intensity of segregation. The results indicate that several designs of the BPPM significantly enhance the PPM's mixing performance. The best BPPMs are identified with regard to compactness and energy consumption. © 2017 American Institute of Chemical Engineers AIChE J, 64: 717–729, 2018

show abstract

Effects of mixing protocol and mixing time on viscoelasticity of compatibilized PP/PS blends

Cited by 24 publications

References 44 publications

Nonlinear behavior of PP/PS blends with and without clay under large amplitude oscillatory shear (LAOS) flow

Nonlinear behavior of PP/PS blends with and without clay under large amplitude oscillatory shear (LAOS) flow

Tuning the Conductivity of Nanocomposites through Nanoparticle Migration and Interface Crossing in Immiscible Polymer Blends: A Review on Fundamental Understanding

Chaotic mixing in a barrier‐embedded partitioned pipe mixer

Contact Info

Product

Resources

About