Phase behavior and rheology of miscible and immiscible blends of linear and hyperbranched siloxane macromolecules

Ilyin, Sergey O.; Makarova, V. V.; Polyakova, M. Yu.; Куличихин, В. Г.

doi:10.1016/j.mtcomm.2019.100833

Cited by 30 publications

(15 citation statements)

References 94 publications

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“…Thereby, asphaltenes act as reinforcing particles at the room temperature, and as plasticizers at elevated ones. Wherein, the mixture containing 10 wt% of asphaltenes can be considered as an example of a molecular nanocomposite, [ 77‐79 ] since the size of both asphaltene molecules and their nanoaggregates is of the order of a few nanometers and the asphaltenes are dissolved in the medium of block copolymer (ie, deagglomerated to a nanoscale level). At higher asphaltene content, the strength decreases to its initial value, probably due to the agglomeration of asphaltenes.…”

Section: Resultsmentioning

confidence: 99%

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Ignatenko

Kostyuk

Смирнова

et al. 2020

Polymer Engineering & Sci

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The use of heavy crude oil asphaltenes and resins (termed asphaltenes) as the components of hot‐melt adhesives based on the styrene‐isoprene triblock copolymer was considered. The rheological, thermophysical, strength, and adhesive characteristics of the mixtures containing from 10 to 40 wt% of asphaltenes were studied. The addition of 10 to 20 wt% of asphaltenes enhanced the strength and adhesive properties of the mixtures and only slightly changed their rheology. The higher concentrations of asphaltenes reduced the viscosity of the mixtures but did not lead to improved characteristics of the adhesives. The ambiguous effect of asphaltenes is probably due to their uneven distribution between the microphases of the block copolymer as well as their ability to act both plasticizers and reinforcing particles depending on temperature. A comparison of asphaltenes and conventional tackifiers based on hydrocarbon resins revealed their comparable effect on the properties of the block copolymer.

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Section: Resultsmentioning

confidence: 99%

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Ignatenko

Kostyuk

Смирнова

et al. 2020

Polymer Engineering & Sci

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“…A detailed description of the technique has been given earlier. [52][53][54] Micrographs of diffusion zones were obtained using an objective with 3.5× magnification and a digital camera with a 12MP 1/1.7 00 -type Sony IMX226 CMOS image sensor (Tokyo, Japan). A diode laser KLM-A532-15-5 (FTI-Optronic, Saint Petersburg, Russia) with a wavelength of 532 nm was used as the light source.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, interference bands bend along the diffusion zone, which makes it possible (by counting the bands crossing the axis of mass transfer during the transition from one medium to another) to determine the profile of the change in refractive index along the diffusion zone and, accordingly, to find the concentrations of diffusing compounds at any point of interest. A detailed description of the technique has been given earlier 52–54 . Micrographs of diffusion zones were obtained using an objective with 3.5× magnification and a digital camera with a 12MP 1/1.7″‐type Sony IMX226 CMOS image sensor (Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Ilyin

Yadykova

Makarova

et al. 2020

Polymer International

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Sulfonated poly(1,3,4-oxadiazole-2,5-diyl-1,4-phenyleneoxy-1,4-phenylene), poly(1,3,4-oxadiazole-2,5-diyl-10,10-dioxophenoxathiine-2,8-diyl) and their copolymers were one-pot synthesized in fuming sulfuric acid with the use of 4,4 0-oxydibenzoic acid and hydrazine sulfate as initial reagents. These copolymers were non-fusible and did not dissolve in individual liquids except sulfuric acid. However, it was possible to achieve their unlimited solubility using a mixed solvent that contained dimethyl sulfoxide, formamide and water. In dilute and semi-dilute solutions, the copolymers behaved like polyelectrolytes, while in concentrated solutions they formed gels; moreover, in the case of high polymer content, the gels were in a liquid crystalline state. The degree of sulfonation, temperature and water content in the mixed solvent influenced the state of copolymer solutions, their viscosity and viscoelasticity. The finding of the mixed solvent made it possible to form polymer films whose strength and heat resistance reached 33 MPa and 470°C, respectively. The ionic conductivity of the films under direct current conditions was 0.001-0.01 ∼S cm-1 for sodium cations and 0.3-1 mS cm-1 for protons.

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“…It was surprising that the viscosity of the blends was lower than the viscosity of both PMP and PIB, regardless of the molecular weight of the latter (Figure 1b). Thus, the small solubility of polyisobutylene in the polymethylpentene medium cannot cause a sharp decrease in viscosity, as the viscosity of solutions is to obey the rule of logarithmic additivity and cannot be lower than the viscosity of both components [33] (in addition, if the reason for the decrease in blend viscosity was the PIB solubility in PMP, the viscosity of the blend based on the least-viscous B15 would be lower than that of other blends). The low viscosity of the blends may be due to wall slip [34,35], which, however, is unlikely due to the very high adhesion of polyisobutylene to the steel surface (e.g., these polyisobutylenes are the basis of pressure-sensitive adhesives [36,37]).…”

Section: Effect Of Pib Molecular Weightmentioning

confidence: 99%

Formation of Microfiltration Membranes from PMP/PIB Blends: Effect of PIB Molecular Weight on Membrane Properties

et al. 2020

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A series of microfiltration membranes were fabricated by the extraction of polyisobutylene (PIB) from its immiscible blends with polymethylpentene (PMP). Three PIB with different molecular weight of 7.5 × 104 (Oppanol B15), 34 × 104 (Oppanol B50) and 110 × 104 (Oppanol B100) g/mol, respectively, were used to evaluate the effect of molecular weight on the porous structure and transport properties of resulting PMP-based membranes. To mimic the conditions of 3D printing, the flat-sheet membranes were fabricated by means of melting of mixtures of various PMP and PIB concentrations through the hot rolls at 240 ∘ C followed by a quick cooling. The rheology study of individual components and blends at 240 ∘ C revealed that PIB B50 possessed the most close flow curve to the pure PMP, and their blends demonstrated the lowest viscosity comparing to the compositions made of PIB with other molecular weights (B15 or B100). SEM images of the cross-section PMP membranes after PIB extraction (PMP/PIB = 55/45) showed that the use of PIB B50 allowed obtaining the sponge-like porous structure, whereas the slit-shaped pores were found in the case of PIB B15 and PIB B100. Additionally, PMP/B50 blends demonstrated the optimum combinations of mechanical properties (str = 9.1 MPa, E = 0.20 GPa), adhesion to steel (adh = 0.8 kPa) and retention performance (R240 nm = 99%, R38 nm = 39%). The resulting membranes were non- or low-permeable for water if the concentration of PIB B50 in the initial blends was 40 wt.% or lower. The optimal filtration performance was observed in the case of PMP/B50 blends with a ratio of 55/45 (Pwater = 1.9 kg/m2hbar, R240 nm = 99%, R38 nm = 39%) and 50/50 (Pwater = 1100 kg/m2hbar, R240 nm = 91%, R38 nm = 36%).

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Phase behavior and rheology of miscible and immiscible blends of linear and hyperbranched siloxane macromolecules

Cited by 30 publications

References 94 publications

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Formation of Microfiltration Membranes from PMP/PIB Blends: Effect of PIB Molecular Weight on Membrane Properties

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