The rheological properties of polystyrene/poly(vinylmethylether) blend near the critical region and in the homogenous region

Kim, Jin Kon; Son, Hye Won

doi:10.1016/s0032-3861(99)00030-0

Cited by 34 publications

(29 citation statements)

References 42 publications

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“…In contrast, at high temperatures, G 0 exhibits a shoulder, namely second plateau, together with an increasing width with the increase of temperature in the low u region. These phenomena were reported for polystyrene/polyvinyl methyl ether (PS/PVME) blend, and the presence of the second plateau in G 0 was assigned to phase-separated domains of PS and PVME [13,14]. On the other hand, this behavior has been believed to be the result of change from homogeneous to heterogeneous structure [15] and was designated the fingerprint for the presence of phase-segregated domains [16].…”

Section: Effect Of Phase-separation On Dynamic Viscoelastic Responsementioning

confidence: 81%

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

Gong

Zheng

2004

Polymer

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Section: Effect Of Phase-separation On Dynamic Viscoelastic Responsementioning

confidence: 81%

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

Gong

Zheng

2004

Polymer

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“…These results are in agreement with those of Kim and Son, who have investigated the rheology of miscible PS/PVME blends using T gi , T g , and T gf as reference temperatures. 37 They have observed a milder variation of the zero-shear viscosity when T gf was used as the reference temperature and have concluded that the dynamics of the chains do not follow the average mobility of the blend at T g .…”

Section: Resultsmentioning

confidence: 99%

Influence of the Reference Temperature on the Orientation and Relaxation of Miscible Polystyrene/Poly(vinyl methyl ether) Blends

et al. 2002

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The deformation and relaxation behavior of polymers depends heavily on temperature. In miscible polystyrene/poly(vinyl methyl ether) (PS/PVME) blends, which possess a broad glass transition region, polarization modulation infrared linear dichroism (PM-IRLD) measurements show that when the mean glass transition temperature (T g) is used as the reference temperature, the orientation and relaxation of orientation of PS in the blends depend significantly on the composition. In contrast, similar values are obtained for blends containing between 40 and 100% PS when the end of the glass transition region (Tgf) is used as the reference temperature. Physical aging experiments made by differential scanning calorimetry indicate that Tgf can be associated with the highest temperature at which enthalpic relaxation occurs, above the mean Tg of the blend. Both series of results have been analyzed, first, by considering the presence of concentration fluctuations in the miscible blends and, second, in the framework of the Lodge-McLeish model.

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“…However, at higher temperatures their relaxation times deviate with a magnitude dependent on the molecular weight ratio [206][207][208][209][210]. Kim and Son [211] plotted log versus log for different compositions and temperatures; at 10 wt% PS the data formed a linear dependence independent of stretching from below to above LCST. As PS content increased to 30 or 50 wt% the superposition was limited to the miscible region at < LCST.…”

Section: Generalmentioning

confidence: 99%

“…Within the region between binodal and spinodal the system is metastable, characterized by strong interrelation between the rheology and thermodynamics [211,[213][214][215]]. …”

Section: Phase Separation and Flowmentioning

confidence: 99%

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Rheology of Polymer Blends

Utracki

2011

Encyclopedia of Polymer Blends

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The first polymer blend was patented in 1846 and since then blends have became ubiquitous. Blending may provide a full set of material properties, improving processability and/or specific properties. With the advancement of technology there is the notorious growth of complexity -while in the beginning blending involved two polymers, initially without a compatibilizer, more recent commercial alloys have up to five polymers, three compatibilizers, and frequently are reinforced with macro-or nanoparticles [1].Blends are classified as either thermodynamically miscible or immiscible, with the latter dominating. However, imposition of a flow affects the thermodynamic equi librium and it may enhance the miscibility of immiscible blends or vice-versa -there is an interrelation between rheology and thermodynamics. Similarly, flow affects the degree of deformation of the dispersed phase, thus in immiscible blends there are other interrelations between rheology and morphology, which affect the blend performance. To the complexity of polymer alloys and blends (PAB) behavior one must add the incorporation of solids, either in the form of filler and nanofiller particles or by simple fact of blending two components with widely different transition temperatures.Since the flow of PAB is complex, it is useful to revert to simple models, for example, for miscible blends to solutions or mixtures of polymer fractions, for immiscible blends to emulsions or suspensions, and for compatibilized blends to block copolymers (Table 2.1). It is also advisable to study flow behavior of multiphase systems at constant stress (not at constant deformation rate) [2,3].For miscible blends, the free volume theory predicts a positive deviation from the log-additivity rule (PDB, positively deviating blend). However, depending on the system and method of preparation, these blends may show a positive deviation, negative deviation, or additivity [4]. Upon mixing, the presence of specific interac tions may change the free volume and degree of entanglement, which in turn affect the flow behavior [5,6]. For immiscible blends the flow is similarly affected, but in addition there are at least three contributing phases: of the polymeric matrix, of the First Edition. Edited by Avraam I. Isayev.

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The rheological properties of polystyrene/poly(vinylmethylether) blend near the critical region and in the homogenous region

Cited by 34 publications

References 42 publications

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

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

Influence of the Reference Temperature on the Orientation and Relaxation of Miscible Polystyrene/Poly(vinyl methyl ether) Blends

Rheology of Polymer Blends

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