Dynamic rheological behavior and morphology near phase-separated region for a LCST-type of binary polymer blends

Du, Ming; Gong, Jing‐Xu; Zheng, Qiang

doi:10.1016/j.polymer.2004.07.069

Cited by 51 publications

(33 citation statements)

References 17 publications

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“…19 Various protocols have been proposed to rheologically detect the phase separation temperature. The time−temperature superposition (TTS) principle 9,14,20,21 and Cole−Cole plot (plotting η″ vs η′) 14,20 are most frequently used to distinguish whether the blends are in the homogeneous or heterogeneous state. These methods utilize the dynamic viscoelastic data at various temperatures, and the accuracy of the transition temperature thus determined is affected by the width of the temperature range examined.…”

Section: Introductionmentioning

confidence: 99%

Phase Separation of Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends with Controlled Distribution of Silica Nanoparticles

Huang

Gao

et al. 2012

Macromolecules

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Effects of selective location of silica nanoparticles on the phase separation of poly(methyl methacrylate)/poly(styrene-coacrylonitrile) (PMMA/SAN) blends were investigated via combination of rheological method and optical microscopy. Through grafting polystyrene chain to the surface of silica nanoparticles, the silica nanoparticles were controlled to selectively locate at interfaces or in the PMMA-rich domains. Power-law analysis of the moduli and shifted Cole−Cole plots were applied to determine rheological transition temperature (apparent binodal temperature) of blend with near-critical and off-critical compositions for both neat blends and particle-filled blends. The particle location had significant influence on the rheological transition temperature but little impact on optically determined binodal temperature. This discrepancy was discussed through morphology observation via transmission electron microscopy (TEM) for blends under different phase separation conditions. It was found that nanoparticles retard coarsening of morphology during phase separation. The most striking slowdown was found in off-critical blends with nanoparticles located on the interface. On the other hand, nanoparticles preferentially locating in the minor phase could act as nucleation sites but decreased the total number of nuclei. The difference in the rheological transition temperatures is ascribed to the effect of nanoparticles on the components' viscoelasticity and the morphology during phase separation.

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Section: Introductionmentioning

confidence: 99%

Phase Separation of Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends with Controlled Distribution of Silica Nanoparticles

Huang

Gao

et al. 2012

Macromolecules

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“…According to our previous works [32,[41][42][43][44], the slope decrease can be attributed to the network growing and forming, and G 0 increase in low frequencies reflects the extent of network formation. Hence, the network extent progressively increases with C s increasing.…”

Section: Dynamic Rheological Behavior Of Nacmc-c 12 Tab Complex Solutmentioning

confidence: 71%

Steady and dynamic rheological behaviors of sodium carboxymethyl cellulose entangled semi-dilute solution with opposite charged surfactant dodecyl-trimethylammonium bromide

Shangguan

et al. 2009

Journal of Colloid and Interface Science

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“…G′∝ω 2 and G″∝ω, respectively [25] . The rise of G′ in low ω region for multi-phase polymer systems is named 'second plateau' which is often ascribed to the formation of a higher ordered structure, such as cross-link [10] , phase-separation [26] or filled network [27] . However, it is interesting that although the IPC is in a phase-separated state [4,10,14] , no 'second plateau' appears for as-received IPC at 210°C, which may be attributed to the good dispersion of ethylenepropylene copolymer in original IPC.…”

Section: Effect Of Shearing On Thermal Behavior Of Ipcmentioning

confidence: 99%

Influence of shearing on impact polypropylene copolymer: Phase morphology, thermal and rheological behavior

Liang

Chen

et al. 2012

Chin J Polym Sci

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The influences of shearing conducted by a Brabender rheometer on phase morphology, thermal and rheological behavior of a commercial impact polypropylene copolymer (IPC) were studied. The crystallization and melting traces show that short-time annealing at 210°C is unable to completely erase the influence of shearing on the samples. When the samples which were treated at a rotation speed of 80 r/min crystallize at a cooling rate of 10 K/min, their T c s and corresponding T m s obviously rise with the increase of shearing time. Furthermore, the POM results reveal that the shearing can lead to the formation of shish-kebab and the shish-kebab amount is proportional to shearing time. The rheological measurement results show that the treated samples exhibit different G′~ω dependences. The 'second plateau' appears when the sample is treated at a rotation speed of 60 r/min or 80 r/min for 10 min, and linear G′~ω dependence is observed at other rotation speeds. In addition, it is found that the appearance of the 'second plateau' depends on the shearing time when the rotation speed is fixed. According to SEM observations, it is proposed that the 'second plateau' of IPC samples should be ascribed to the aggregation of dispersion particles.

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Dynamic rheological behavior and morphology near phase-separated region for a LCST-type of binary polymer blends

Cited by 51 publications

References 17 publications

Phase Separation of Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends with Controlled Distribution of Silica Nanoparticles

Phase Separation of Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Blends with Controlled Distribution of Silica Nanoparticles

Steady and dynamic rheological behaviors of sodium carboxymethyl cellulose entangled semi-dilute solution with opposite charged surfactant dodecyl-trimethylammonium bromide

Influence of shearing on impact polypropylene copolymer: Phase morphology, thermal and rheological behavior

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