N,N'-BIS[3-(TRIETHOXYSILYL)PROPYL]UREA

• CAS: 69465-84-5
• Catalog Number: ACM69465845
• Category: Main Products
• Molecular Weight: 468.73
• Molecular Formula: C19H44N2O7SI2
• Flash Point: 17 °C
• Appearance: Liquid

Case Study

Thermal Tuning of CO₂ Separation Membranes via Degradable Urea-Based Siloxane Networks Containing BTESPU

Horata, Katsuhiro, et al. Separations 11.4 (2024): 110.

Polysilsesquioxane (PSQ) membranes functionalized with CO₂-philic organic units are promising for gas separation, but they typically face an inherent trade-off between permeability and selectivity. This study explored a novel strategy: introducing thermally degradable monoalkylurea groups through copolymerization of N-[(3-triethoxysilyl)propyl]urea (TESPU) with bis(triethoxysilyl)ethane (BTESE) using N,N'-bis(triethoxysilylpropyl)urea (BTESPU) as a structurally related reference compound. The monoalkylurea units undergo controlled thermal conversion into dialkylurea structures with release of small molecules including CO₂ and NH₃ under nitrogen atmosphere, generating void spaces in the siloxane matrix.
Experimental Protocol: Sol-gel processing was used to prepare PSQ sols from 1:1 TESPU-BTESE mixtures in ethanol with controlled hydrolysis. The sols were coated onto porous alumina supports with an intermediate silica-zirconia layer, then calcined at 200 degrees C and 300 degrees C under nitrogen. Gas permeation was evaluated at 50-200 degrees C using He, H₂, CO₂, N₂, and SF₆ as probe molecules. Structural changes were monitored by TG-MS, IR spectroscopy, and quantum chemical calculations.
Performance Evaluation: The TESPU-BTESE membrane calcined at 200 degrees C exhibited CO₂/N₂ permselectivity of 14.4 with CO₂ permeance of 7.9 x 10^-8 mol m^-2 s^-1 Pa^-1. Upon raising the calcination temperature to 300 degrees C, the CO₂ permeance dramatically increased to 1.2 x 10^-6 mol m^-2 s^-1 Pa^-1 (equivalent to 3.6 x 10³ GPU), though permselectivity decreased to 8.4. This approach demonstrates that controlled thermal degradation of organic units provides a viable method for tuning membrane separation performance.

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August 11, 2023

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Custom Q&A

What is the molecular formula of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The molecular formula is C19H44N2O7Si2.

What are the synonyms of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The synonyms are 1,1-bis(3-triethoxysilylpropyl)urea, N,N-Bis[3-(triethoxysilyl)propyl]urea, SCHEMBL442777, and DTXSID90624138.

What is the molecular weight of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The molecular weight is 468.7 g/mol.

What is the IUPAC name of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The IUPAC name is 1,1-bis(3-triethoxysilylpropyl)urea.

What is the InChI of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The InChI is InChI=1S/C19H44N2O7Si2/c1-7-23-29(24-8-2,25-9-3)17-13-15-21(19(20)22)16-14-18-30(26-10-4,27-11-5)28-12-6/h7-18H2,1-6H3,(H2,20,22).

What is the InChIKey of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The InChIKey is PCBFLGCGQJZONK-UHFFFAOYSA-N.

What is the canonical SMILES of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The canonical SMILES is CCO[Si](CCCN(CCC[Si](OCC)(OCC)OCC)C(=O)N)(OCC)OCC.

What is the CAS number of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The CAS number is 69465-84-5.

What is the hydrogen bond donor count of N,N'-Bis[3-(triethoxysilyl)propyl]urea?

The hydrogen bond donor count is 1.

Is N,N'-Bis[3-(triethoxysilyl)propyl]urea canonicalized?

Yes, N,N'-Bis[3-(triethoxysilyl)propyl]urea is canonicalized.