Coexistence curves of polystyrene/ poly(dimethylsiloxane) blends

Nose, Takeru

doi:10.1016/0032-3861(95)95303-i

Cited by 95 publications

(96 citation statements)

References 18 publications

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“…The composition of coexisting phases approaches unity or zero, and the phase separation becomes more complete, as the molecular weight increases. 5 The oligomer blend (PS6/PDMS5) near the critical point exhibits a rapid increase of y with decreasing temperature, while the high molecular-weight blend show a positive temperature dependence of y. The intermediate molecular-weight blends show a negative mild change in PS6/PDMS14 or almost no change in PS6/ PDMS37 with increasing temperature.…”

Section: Temperature Dependence Of Interfacial Tensionmentioning

confidence: 99%

“…The Ap was evaluated from independently-measured coexistence curves of the PS/PD MS blends. 5 Details of the experiments and data analysis have been described in the previous paper. 3 …”

Section: Interfacial Tension Measurementsmentioning

confidence: 99%

“…The x-parameter between PS and PDMS as a function of temperature and molecular weight has been evaluated from the coexistence curve in a previous work, where the x-parameter was determined such that the Flory-Huggins type mean-field theory reproduced the experimental A¢ of the coexistence curve excluding the vicinity of the critical point. 5 as a function of temperature t in °C. The polymerization index N is defined to be proportional to the molar volume, and can be evaluated from the molar mass and specific volume.…”

Section: N}t2+n}f2mentioning

confidence: 99%

“…5 The value of x is indispensable and will be utilized in data analysis and discussion in the present study. The same series of blend systems are here used to study the intermediate region.…”

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confidence: 99%

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Temperature Dependence of Interfacial Tension of Demixed Polymer Blend Melts: Polystyrene/Poly(dimethylsiloxane)s

Nose

1997

Polym J

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ABSTRACT:Interfacial tension of polystyrene/poly(dimethylsiloxane) blends with different molecular weights have been measured as a function of temperature by sessile drop method. The results are described as a scaled relation of reduced interfacial tension vs. reduced segregation strength, xix: 1, where x is the segmental interaction parameter and x, is x at the critical temperature. The scaled relation is discussed on the basis of mean-field theory, and a semi-empirical expression has been presented for the scaled relation covering a wide temperature range.KEY WORDS Interfacial Tension / Polymer Blends / Temperature Dependence / Polystyrene / Poly(dimethylsiloxane) / It is theoretically predicted that there are three temperature regions for interfacial tension of polymer melts according to the segregation strength. 1 · 2 In Region I of weak segregation near the critical point, the interfacial tension appears and increases as temperature goes away from the critical point. Region I is specified by x 2/ N, where xis the Flory-Huggins interaction parameter and N is the degree of polymerization. In strong-segregation region, Region II, where 2/N 1, it is proportional to Tx, with T being the absolute temperature. A region unique to polymeric systems is Region II, where the interfacial tension can increase with increasing temperature even if the polymer blend has the upper critical solution temperature (UCST).In our previous studies, Region I and Region II have been investigated by measuring the temperature dependence of interfacial tension for polystyrene (PS)/ poly(dimethylsiloxane) (PDMS) blends. 3 • 4 It has been demonstrated that the interfacial tension exhibits predicted temperature dependences unique to Region I and Region II, respectively. In this study, adding data of interfacial tension in the intermediate region, we will make a better understanding of the interfacial-tension behavior over the whole temperature region from Region I to Region II by scaled plots.The author has measured coexistence curves of PS/ PDMS mixtures with different molecular weights to evaluate the interaction parameter x as functions of temperature and molecular weight. 5 The value of x is indispensable and will be utilized in data analysis and discussion in the present study. The same series of blend systems are here used to study the intermediate region.Details of the scaling arguments based on the squaregradient theory of mean-field type for the interfacial tension will be made, and a semi-empirical expression will be presented. THEORETICAL CONSIDERATIONS AND A SCALED EXPRESSIONAdopting the square-gradient theory for the free 218 energy of a non-uniform binary system, the interfacial tension y is given by 1 • 2 • 6(1)Here, Af is the excess local free energy per site as a function of concentration ¢ in volume fraction at the position z with the z-axis being perpendicular to the interface, K is the coefficient of square...

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Section: Temperature Dependence Of Interfacial Tensionmentioning

confidence: 99%

“…The Ap was evaluated from independently-measured coexistence curves of the PS/PD MS blends. 5 Details of the experiments and data analysis have been described in the previous paper. 3 …”

Section: Interfacial Tension Measurementsmentioning

confidence: 99%

Section: N}t2+n}f2mentioning

confidence: 99%

mentioning

confidence: 99%

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Temperature Dependence of Interfacial Tension of Demixed Polymer Blend Melts: Polystyrene/Poly(dimethylsiloxane)s

Nose

1997

Polym J

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“…Also, we can scale up or down the pitch by changing molecular weight ratios of the block copolymers. Furthermore we can scale down the pattern sizes of sub 10 nm below if we change other block copolymer with high χ parameters such as polystyrene-block polyethylene oxide (PS-PEO) [31], polystyreneblock-poly(dimethylsiloxane) (PS-b-PDMS) [32] , and poly (2-vinylpyridine-blockpoly(dimethylsiloxane) (P2Vp-b-PDMS). Though only one example using a block copolymer phase separation was demonstrated, this method opens the door to various applications in electronics, optics, biosensing, bioimaging and so on.…”

Section: Resultsmentioning

confidence: 99%

Position Control of Metal Nanoparticles by Self-Assembly

Yamamoto

Ohnuma

Ohtani

et al. 2014

J. Photopol. Sci. Technol.

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Bottom-up self-assembly has the capacity to overcome the limitation of top down nanofabrication. Recently, nanoparticles or molecules are expected to use as the building blocks. By using them it is desirable to place nanometer sized components such as nanopartilces in exact positions for nano-fabrication with high precision and reproducibility. In particular, gold (Au) nanoparticles, which covalently linked to biomolecules such as DNA, peptides, nucleic acids, proteins, and cell have attracted much attention for biosensing application, bioimaging application and so on. In this study, we present a novel and simple method of position control of Au nanoparticles on a nanopattern by self-assembly techniques such as block copolymer phase separation and self-assembled monolayers. Spherical Au nanoparticles were immobilized above the Au nanopatterns with a gap of a few nanometers. We believe this method will contribute to studies on the observation of single biomolecules such as DNA, peptides, nucleic acids, proteins, and so on.

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Hierarchically Porous Polymer and Carbon Monoliths via Controlled/Living Radical Polymerization

Kanamori

Hasegawa

Nakanishi

2021

Encyclopedia of Polymer Science and Technology

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Cross‐linked monolithic polymer networks (or dried gels) with hierarchically porous structures have been prepared by controlled/living radical polymerization techniques such as nitroxide‐mediated radical polymerization (NMP), atom transfer radical polymerization (ATRP), and organotellurium‐mediated living radical polymerization (TERP). Well‐controllable macropores are formed as a transient structure of spinodal decomposition induced during the polymerization of monomers, and smaller pores in the macropore skeletons are resulted from secondary phase separation during the phase separation–gelation process. Also, the obtained networks are pyrolyzed in an inert atmosphere to obtain carbonaceous materials with abundant micropores while preserving the macro‐ and mesoporous morphology. In addition, applications of such hierarchically porous monolithic materials to separation media and electrochemical devices are demonstrated. In the present article, the concept, mechanism, methodology, and experimental results are discussed in detail.

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Coexistence curves of polystyrene/ poly(dimethylsiloxane) blends

Cited by 95 publications

References 18 publications

Temperature Dependence of Interfacial Tension of Demixed Polymer Blend Melts: Polystyrene/Poly(dimethylsiloxane)s

Temperature Dependence of Interfacial Tension of Demixed Polymer Blend Melts: Polystyrene/Poly(dimethylsiloxane)s

Position Control of Metal Nanoparticles by Self-Assembly

Hierarchically Porous Polymer and Carbon Monoliths via Controlled/Living Radical Polymerization

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