Pressure–Volume–Temperature Relationships of Tetraethyl, Tetrapropyl, and Tetrabutyl Orthosilicates

Matsukawa, Hiroaki; Fujii, Aki; Hoshina, Takuya; Otake, Katsuto

doi:10.1021/acs.jced.1c00499

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…In recent years, research efforts have shown the promise of utilizing sc-CO 2 as a replacement for traditional hydrocarbon solvents in polymer synthesis and copolymerization processes. This is due to its environmentally friendly nature, cost-effectiveness, and nonflammable properties. − Polymer synthesis using sc-CO 2 as a pressurizing medium has emerged as a viable approach for obtaining copolymers and polymer products. This process enables the production of polymers and copolymers with desirable properties.…”

Section: Introductionmentioning

confidence: 99%

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Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO₂

Behera,

Baskaran,

Byun

2024

ACS Omega

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The dispersed-phase polymerization of poly-(styrene-co-2,2,3,4,4,4-octafluoropentyl methacrylate), also known as p(styrene-co-OFPMA), took place in supercritical carbon dioxide (sc-CO 2 ). The chemical and physical properties of p(styrene-co-OFPMA) were studied by varying the styrene-to-OFPMA ratios (40:1, 30:1, and 20:1) and 2,2′-azobis(isobutyronitrile) (AIBN) initiator amounts (wt %: 1.0, 2.0, 3.0). The cloud-point data were obtained for various systems, including the binary mixtures of p(styrene-co-OFPMA) (30:1 ratio, AIBN wt %: 1.0, 2.0, 3.0) with supercritical solvents such as sc-CO 2 , sc-CH 3 OCH 3 , sc-C 3 H 6 , sc-C 4 H 8 , and sc-CHClF 2 . Phase behavior (i.e., mixtures) was studied at temperatures of 324−455 K and pressure below 201 MPa. In the binary system of p(styrene-co-OFPMA) + sc-CH 3 OCH 3 , a lower critical solution temperature (LCST)-type curve was observed, characterized by a positive slope. Conversely, the binary systems of p(styrene-co-OFPMA) + (sc-C3H 6 , sc-C 4 H 8 , sc-CHClF 2 ) exhibited an upper critical solution temperature (UCST) behavior with a decreasing slope. The phase equilibrium curves were obtained for p(styrene-co-OFPMA) [30:1; 1.0% (M w = 42,400), 2.0% (M w = 33,800), and 4.0% (M w = 24,100); AIBN: 1.0 wt %] + sc-C 3 H 6 , sc-C 4 H 8 , and sc-CHClF 2 mixtures. These curves exhibited an increasing slope for p(styrene-co-OFPMA) + sc-CH 3 OCH 3 and a negative slope for p(styrene-co-OFPMA) + (sc-C 3 H 6 , sc-C 4 H 8 , sc-CHClF 2 ) systems, indicating distinct phase behavior. Tetramethyl orthosilicate (TMOS) addition (0.0−68.9 wt %) to P(styrene-co-OFPMA) (30:1; AIBN wt %: 1.0) + solvents altered the phase equilibrium, switching from UCST to LCST, as evidenced by changes in the pressure−temperature slope.

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Section: Introductionmentioning

confidence: 99%

“…This is due to its environmentally friendly nature, cost-effectiveness, and nonflammable properties. 2 − 4 Polymer synthesis using sc-CO 2 as a pressurizing medium has emerged as a viable approach for obtaining copolymers and polymer products. This process enables the production of polymers and copolymers with desirable properties.…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO₂

Behera,

Baskaran,

Byun

2024

ACS Omega

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Saturated Vapor Pressure Measurements for Tetraethyl, Tetrapropyl, and Tetrabutyl Orthosilicates up to 473 K

Matsukawa,

Otake

2024

J. Chem. Eng. Data

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The saturated vapor pressures of tetraethyl orthosilicate (TEOS, (CH 3 CH 2 O) 4 Si), tetrapropyl orthosilicate (TPOS, (CH 3 CH 2 CH 2 O) 4 Si), and tetrabutyl orthosilicate (TBOS, (CH 3 CH 2 CH 2 CH 2 O) 4 Si) were measured at temperatures up to 473 K using an apparatus based on the general static method. The standard uncertainties (u s ) were u s (T) = 0.029 K and u s (p) = 0.015 kPa, and the maximum combined expanded uncertainties U (0.95 level of confidence) were U(T) = (0.52, 8.60, and 1.64 K) and U(p sat ) = (2.81, 3.09, and 0.82 kPa) for TEOS, TPOS, and TBOS, respectively. Furthermore, the saturated vapor pressure was correlated using the Antoine equation to determine its parameters. The measured saturated vapor pressures were correlated with previously reported pressure−volume-temperature data using the PC-SAFT equation of state (EoS), followed by optimizing the pure component parameters of the PC-SAFT EoS. A relationship between the molecular structure and component parameters was identified, and the occupied volumes were determined according to the Sanchez−Lacombe and PC-SAFT EoS, revealing significant differences. Our findings highlight the potential of using the molecular structure to predict pure component parameters. In addition to providing accurate vapor pressure data for these orthosilicates, this study offers insights into correlation methods, emphasizing the importance of parameter determination in equation of state modeling.

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Pressure–Volume–Temperature Relationships of Tetraethyl, Tetrapropyl, and Tetrabutyl Orthosilicates

Cited by 2 publications

References 26 publications

Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO₂

Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO₂

Saturated Vapor Pressure Measurements for Tetraethyl, Tetrapropyl, and Tetrabutyl Orthosilicates up to 473 K

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Pressure–Volume–Temperature Relationships of Tetraethyl, Tetrapropyl, and Tetrabutyl Orthosilicates

Cited by 2 publications

References 26 publications

Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO2

Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO2

Saturated Vapor Pressure Measurements for Tetraethyl, Tetrapropyl, and Tetrabutyl Orthosilicates up to 473 K

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Product

Resources

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Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO₂

Phase Behavior of the Mixtures of 2- and 3-Components for Poly(styrene-co-octafluoropentyl methacrylate) by Dispersion Polymerization under CO₂