The effect of phase‐separated morphology on the rheological properties of polystyrene/poly(vinyl methyl ether) blend

Kim, Jin Kon; Son, Hye Won; Lee, Yongbok; Kim, Jinhwan

doi:10.1002/(sici)1099-0488(19990501)37:9<889::aid-polb3>3.3.co;2-a

Cited by 13 publications

(27 citation statements)

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“…[45][46][47][48] About 30 different published diagrams for a mixture of homopolymers PS and PVME of different molecular weight were used for comparative analysis. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] 3 | RESULTS AND DISCUSSION Figure 1 shows the interferograms of interdiffusion zones of conjugate phases of PS and PVME. The designations I and II correspond to the regions of pure components (I -PVME, II -PS), and region III is the transition zone with a concentration gradient (Figure 1(a)).…”

Section: Characterization Methodsmentioning

confidence: 99%

“…It can be seen that the experimental-calculated data show the presence of two phase diagrams-one with LCST is localized in the high temperature region, and the other with UCST-in the low temperature region. It is interesting to note that the difference between the UCST and LCST amounts to about 60-70 K, although, it was previously believed 7 that this value should be significantly larger and be in the order of 150-200 K. According to the data of electron microscopy, 28 the diagram is supplemented by points (c) limiting the phase reversal region (IV). To fully characterize the PS-PVME system, the generalized diagram is plotted with the data on the glass transition temperatures of the mixture both according to Fox Equation [1] (d) and with the data previously obtained by a number of authors, [8][9][10] generalized into a single dependence (e).…”

Section: Phase Equilibrium Diagram Modelingmentioning

confidence: 95%

“…To estimate the general temperature dependence of the Flory-Huggins parameter, we have calculated its values for all diagrams of the PS-PVME system phase state found in the literature. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] The results are presented in Figure 5.…”

Section: Thermodynamic Analysis Of the Phase Equilibriummentioning

confidence: 99%

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Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system

Nikulova

Chalykh

2020

J of Applied Polymer Sci

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The phase diagrams of polystyrene (PS)-poly(vinyl methyl ether) (PVME) system obtained via optical interferometry in the study of polymer interdiffusion are presented. The influence of molecular weight of the PS on the position of the binodal curve dome and the critical point is shown. Paired interaction parameters and their temperature dependences are calculated in the framework of Flory-Huggins theory both for the present experimental diagrams and for the ones, previously obtained by different authors. It is shown that the generalized temperature dependence of the Flory-Huggins parameter can be used to model phase equilibrium in a wide range of temperatures and compositions. For the first time for PS-PVME system, the generalized phase state diagram characterized by both lower and upper critical solution temperatures is calculated and constructed.

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Section: Characterization Methodsmentioning

confidence: 99%

Section: Phase Equilibrium Diagram Modelingmentioning

confidence: 95%

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Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system

Nikulova

Chalykh

2020

J of Applied Polymer Sci

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“…(ІІ) Dynamic time sweep experiments were carried out to investigate the phase separation kinetics at a fixed frequency of 1 rad s −1 . According to Kim et al the early stage of phase separation can be sensitively detected under this frequency. (ІІІ) Dynamic frequency sweep experiments were performed at a strain of 1% and constant temperature (110°C) to study the linear viscoelastic properties.…”

Section: Characterizationmentioning

confidence: 99%

“…The change in rheological behavior with phase‐separation time for the PS/PVME blend can be easily monitored because of the large difference in viscoelastic properties between constituent components . For example, in matrix‐droplet morphology (phase separation under nucleation and growth (NG mechanism), the storage modulus versus frequency curve shows a shoulder with terminal behavior . In the unstable region (phase separation under SD), the storage modulus shows a large deviation from terminal behavior and decreases during the phase separation .…”

Section: Introductionmentioning

confidence: 99%

Effect of selective localization of cellulose nanowhiskers on viscoelastic phase separation

Shahrezaei

Goharpey

Yeganeh

2017

Polymer Engineering & Sci

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Viscoelastic phase separation (VPS) is a fundamental physical phenomenon that creates percolated network structure in dynamically asymmetric mixtures. The object of this study was to investigate the effect of rod shape nanoparticles with different surface chemistries on VPS in the polystyrene/poly(vinyl methyl ether), PS/PVME, blend. For this purpose, hydrophilic (CNWs) and hydrophobic (M‐CNWs) cellulose nanowhiskers (CNWs) were prepared to be used as nanorods. Rheological measurments were employed to investigate the effect of nanowhiskers on phase separation temperature, kinetics of phase separation, and dynamic asymmetry. The evolution of morphology during the phase separation at a fixed quench depth was assessed using polarized optical microscopy. The nanowhiskers were effective in decreasing the correlation length, which slowed down the phase separation. CNWs self‐assembled into the PVME‐rich phase during the phase separation, which led to a decrease in the dynamic asymmetry and beyond a critical volume fraction of CNWs, the VPS mechanism changed to spinodal decomposition (SD). However, in the presence of M‐CNW, the localization of M‐CNWs into the PS‐rich phase enhanced the dynamic asymmetry and at 2 vol% M‐CNWs, the induced PS‐rich network by VPS was arrested. The linear and non‐linear viscoelastic behavior of the samples were studied as well. POLYM. ENG. SCI., 58:928–942, 2018. © 2017 Society of Plastics Engineers

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A Miniature Mixing Device for Polymer Blends Dominated by Biaxial Extensional Deformations

Yin

Lin

et al. 2022

Macro Materials & Eng

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A new miniature mixing device called the "vane mixer" dominated by the synergic action of axial and circumferential extensional deformations is developed for polymer blends. The structure and working principle of the vane mixer are introduced in detail. The effects of mixing time and rotational speed on the morphology, mechanical properties, and crystallization behavior of the high-density polyethylene (HDPE)/graphene (GR) composites are comprehensively investigated, revealing that properly increasing mixing time and rotational speed can promote the dispersion of GR in the HDPE matrix, improve mechanical properties, and reduce the degree of crystallinity. The morphology of blends prepared by the vane mixer is compared with those prepared by the Brabender mixer to evaluate the mixing performance. The experimental results show that the new equipment has excellent mixing efficiency and performance.

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The effect of phase‐separated morphology on the rheological properties of polystyrene/poly(vinyl methyl ether) blend

Cited by 13 publications

References 0 publications

Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system

Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system

Effect of selective localization of cellulose nanowhiskers on viscoelastic phase separation

A Miniature Mixing Device for Polymer Blends Dominated by Biaxial Extensional Deformations

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