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Advanced Search Results For "PROPYLENE oxide"

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 "PROPYLENE oxide"
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Efficient synthesis of cyclic carbonate via transformation of CO2 catalyzed by solid-base bifunctional graphitic carbon nitride materials.

Publication Type: Academic Journal

Source(s): Research on Chemical Intermediates. Dec2022, Vol. 48 Issue 12, p4883-4900. 18p.

Abstract: Catalytic cycloaddition of CO2 is a practical strategy to synthesize cyclic carbonate and is also a sustainable route to utilize CO2. Graphitic carbon nitride (g-C3N4) is a typical solid base but showed limited activity in catalytic cycloaddition of CO...

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Preparation and Properties of Different Polyether-Type Defoamers for Concrete.

Publication Type: Academic Journal

Source(s): Materials (1996-1944). Nov2022, Vol. 15 Issue 21, p7492. 12p.

Abstract: In this study, a series of polyether-type defoamers for concrete which consist of the same alkyl chain (hydrophobic part) but different polyether chains (hydrophilic part) was prepared, and the structure–property relationship of the defoamers was inves...

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Theoretical Investigation into a Possibility of Formation of Propylene Oxide Homochirality in Space.

Publication Type: Academic Journal

Source(s): Astrobiology. Nov2022, Vol. 22 Issue 11, p1330-1336. 7p.

Abstract: The preferential synthesis or destruction of a single enantiomer by ultraviolet circularly polarized light (UV-CPL) has been proposed as a possible triggering mechanism for the extraterrestrial origin of homochirality. Herein, we investigate the photoa...

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Dispersion and improvement of organoclays in nanocomposites based on poly(propylene oxide).

Publication Type: Academic Journal

Source(s): Journal of Thermoplastic Composite Materials. Nov2022, Vol. 35 Issue 11, p1889-1902. 14p.

Abstract: This work is mainly concentrated on the preparation and characterization of poly(propylene oxide) (PPO)/organic clay nanocomposites. The effects of the nature of organoclays and the method of preparation have been elucidated to evaluate their morpholog...

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Controlled Oxyanionic Polymerization of Propylene Oxide: Unlocking the Molecular‐Weight Limitation by a Soft Nucleophilic Catalysis.

Publication Type: Academic Journal

Source(s): Macromolecular Rapid Communications. Oct2022, Vol. 43 Issue 20, p1-6. 6p.

Abstract: The oxyanionic ring‐opening polymerization of propylene oxide (PO) from an exogenous alcohol activated with benign (complexed) metal‐alkali carboxylates is described. The equimolar mixture of potassium acetate (KOAc) and 18‐crown‐6 ether (18C6) is demo...

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Effect of Water-Reducing Admixtures Having Hybrid Silicon Air-Entraining Surfactants on Some Properties of Concrete Mixtures.

Publication Type: Academic Journal

Source(s): Journal of Materials in Civil Engineering. Sep2022, Vol. 34 Issue 9, p1-14. 14p.

Abstract: In order to improve the fresh properties and freeze-thaw resistance of cementitious systems, water-reducing and air-entraining admixtures are actively used in concrete mixtures. Generally, these mentioned admixtures are added to concrete mixtures as tw...

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Synthesis and Research of Highly Efficient Polyether Demulsifier.

Publication Type: Academic Journal

Source(s): ChemistrySelect. 7/7/2022, Vol. 7 Issue 25, p1-8. 8p.

Abstract: Separation of oil and water has always been a top priority in the oil industry. In this study, bisphenol A phenolamine resin (BPA) was synthesized from bisphenol A, diethylenetriamine and formaldehyde. With KOH as a catalyst, the initiator, ethylene ox...

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Finding reliable methodology for optical rotation and correct predictions of (s)‐methyloxirane and (1R,5R)‐β‐pinene.

Publication Type: Academic Journal

Source(s): Chirality. Sep2022, Vol. 34 Issue 9, p1197-1208. 12p.

Abstract: Theoretical calculations of optical rotation (OR), although important to predict absolute configurations (ACs) and corroborate experiments, require efficient methodology able to reproduce enantiomer specificity and real OR values. Also, troublesome mol...

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Study of catalyst performance of two inorganic/organic and inorganic/inorganic hybrid catalysts on the CO2 cycloaddition to propylene oxide: kinetics and thermodynamics.

Publication Type: Academic Journal

Source(s): Chemical Engineering Communications. 2022, Vol. 209 Issue 9, p1214-1230. 17p.

Abstract: The behavior of two hybrid catalysts: inorganic/organic (KI/chitin) and inorganic/inorganic (KI/amorphous silica-alumina) on the CO2 cycloaddition to Propylene oxide has been compared. Conversions of KI/chitin and KI/Si-Al were 99 and 97% respectively....

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Terpolymerization of propylene oxide, carbon dioxide, and trimethylene carbonate.

Publication Type: Academic Journal

Source(s): Russian Chemical Bulletin. Aug2022, Vol. 71 Issue 8, p1770-1776. 7p.

Abstract: High-molecular-weight polymers with different contents of propylene carbonate (PC), and trimethylene carbonate (TMC) units in the polymer chain were synthesized by the coordination anionic copolymerization of carbon dioxide, propylene oxide (PO), and T...

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