Phase behaviour and interfacial tension of polysiloxane blends

Stammer, Andreas; Wolf, Bernhard

doi:10.1016/s0032-3861(97)00548-x

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…visual cloud points would be between T 1 and T 2 , rather closer to T 1 . The shape of these two curves, T 1 vs. composition and T 2 vs. composition, is similar to that published by Stammer and Wolf 20 for a PDMS-PHMS blend with longer PHMS chains and with lower PHMS polydispersity. These shapes suggest bimodal cloud point curves with two maxima in the full composition range.…”

Section: Cloud Point Curves and Critical Pointssupporting

confidence: 85%

“…Two poly(alkylsiloxane) polymers are chosen in this study: poly(dimethylsiloxane) and poly(hexylmethylsiloxane). Recent results 20 show that this system exhibits bimodal cloud point curve in the concentration-temperature diagram. Results for similar systems 12,21 suggest that we can expect pressureinduced miscibility at low pressures and pressure-induced immiscibility at pressures higher than the pressure of the critical temperature minimum of the upper critical solution temperature (UCST) curve.…”

Section: Introductionmentioning

confidence: 89%

“…For PDMS1 the data were taken from the literature. 20 The results are given in Table 2. The densities of PDMS1 were taken from the same literature.…”

Section: Methodsmentioning

confidence: 99%

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The effect of pressure on the liquid–liquid phase equilibrium of two polydisperse polyalkylsiloxane blends

Imre

Kraska

Yelash

2002

Phys. Chem. Chem. Phys.

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The effect of pressure-induced immiscibility in polymer blends is investigated by experimental and theoretical methods. Experimental data of cloud point curves and critical points are obtained by turbidity measurements. The chosen system is a mixture of polydimethylsiloxane and polyhexylmethylsiloxane which is one of the very few polymer blends exhibiting pressure-induced immiscibility. This unusual behaviour is related to a critical temperature minimum of the critical curve and cloud point isopleths at positive pressure in the temperaturepressure diagram. The effect of the chain length on the critical temperature minimum is investigated here based on theoretical models. The effect of different attraction strength between the polymer segments on the critical temperature minimum is traced in a global phase diagram. In addition, we investigate the appearance of a small closed-loop of miscibility caused by the combination of the critical temperature minimum at positive pressure with a double-humped or bimodal cloud point curve. Such miscibility window can make it possible to process composit materials from incompatible polymers.

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Section: Cloud Point Curves and Critical Pointssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 89%

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The effect of pressure on the liquid–liquid phase equilibrium of two polydisperse polyalkylsiloxane blends

Imre

Kraska

Yelash

2002

Phys. Chem. Chem. Phys.

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“…A sharp drop of the transmitted light is observed for a monomeric system whereas a broader turbidity curve is observed for polydisperse or multimodal polymer systems. 58,59 For F > 0.12, the cloud point temperature increases again with increasing F as observed by Dill and Alsberg in 1925. This increase of the cloud point for high F is associated with a structural transition that might be either an equilibrium phenomenon such as a liquid-solid transition or a non-equilibrium phenomenon such as gelation or aggregation.…”

Section: Comparison Of the Cloud Point Curve And Phase Boundariessupporting

confidence: 68%

Phase behaviour of a wheat protein isolate

et al. 2013

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We investigated the liquid-liquid phase separation of wheat storage proteins with molecular weight (MW) ranging from 25 kg mol(-1) to 300 kg mol(-1). We characterized the onset of the phase separation upon a temperature decrease by turbidity. The protein compositions at equilibrium after temperature quenches were additionally determined by size-exclusion-high performance liquid chromatography. We found that wheat proteins can be classified into two classes according to their phase behaviour. The partition of the proteins between the two phases depends on their MW above a critical size of 45 kg mol(-1). For those high MW proteins, we observed that the behaviour is similar to the one of neutral, linear polymers. Their partition and critical parameters are well described by Flory-Huggins theory. Proteins below 45 kg mol(-1), namely alpha-, beta- and gamma-gliadins, have similar interaction potentials under the physicochemical conditions tested. Their phase diagrams, characterized by a low value of critical volume fraction, are characteristic of long-range interactions. Wheat protein behaviour can resultantly be rationalized in a much simpler way than expected from their complex composition

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“…Sci., 2010, 9, 162-171 | 169 to the initial SNO form. In addition, the larger room for the reaction due to the incompatibility of PDMSO 24 with SNO may also have worked to accelerate the thermal back reaction. The rate constants and molar coloration coefficients are shown in Table 3.…”

Section: Photochromic Behavior Of Film-p and Film-d Dilmentioning

confidence: 99%

Fast decoloration of spironaphthooxazine bound to a poly(dimethylsiloxane) network

Gushiken

Saitō²,

Ubukata

et al. 2010

Photochem Photobiol Sci

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Spironaphthooxazine (SNO) was attached to a three-dimensional network of polysiloxane through the allyloxy group on C-7 of the naphthalene ring of SNO, and the photochemical coloration and thermal decoloration behaviors of this material (Film-P) were examined by comparing their properties with those of model SNO having a 7-propyloxynaphthyl group in solution, in a doped polysiloxane film (Film-D), and in a doped PMMA film. For Film-P, the SNO units were connected to a part of the vinyl groups on the Si atoms of a linear polysiloxane by hydrosilylation, and the remaining vinyl groups were bridged by the bifunctional linear polysiloxane possessing two hydrosilyl groups at both ends of the chain. While Film-P containing 1.7 x 10(-3) mol dm(-3) of the SNO unit formed a transparent film, Film-D containing more than 1.2 x 10(-3) mol dm(-3) could not form a transparent film but segregation of SNO occurred. A transparent Film-D was prepared at 0.54 x 10(-3) mol dm(-3) SNO concentration. The decoloration reaction rate of Film-D was faster than those for Film-P, solutions, and PMMA. However, due to the low concentration, the coloration of Film-D was weak. When the concentration of SNO in Film-P was increased 5.7 times, the decoloration rate became 3.6 times faster. Its half-life time was 0.9 s, which is 3.1 times as fast as that of corresponding solution in hexamethyldisiloxane.

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Phase behaviour and interfacial tension of polysiloxane blends

Cited by 8 publications

References 7 publications

The effect of pressure on the liquid–liquid phase equilibrium of two polydisperse polyalkylsiloxane blends

The effect of pressure on the liquid–liquid phase equilibrium of two polydisperse polyalkylsiloxane blends

Phase behaviour of a wheat protein isolate

Fast decoloration of spironaphthooxazine bound to a poly(dimethylsiloxane) network

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