New Advances in Chemical Research in 2021. Catalysts are in the same phase as the reactants. Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 75178-96-0, Name is tert-Butyl (3-aminopropyl)carbamate, molecular formula is , belongs to benzoxazole compound. In a document, author is Jiang, Xuewei, Category: benzoxazole.
In present work, the incorporation of nonrearrangable codiamines (mPDA, DMB or TFMB) with different substituted groups into an ortho-hydroxypolyimide (HPI) precursor was applied to modify the gas separation and mechanical performances of resultant thermally rearranged (TR) polybenzoxazole membranes. Evolution of the thermal rearrangement for ortho-hydroxy copolyimide precursors was effectively monitored by the TGA-FTIR, WAXD and PALS measurements. The incorporated non-TR-able codiamines and the thermal treatment protocols have a great effect on the chains packing behavior, free volume, mechanical properties as well as the gas separation behavior of resulted TR-PBOI membranes. These TR-PBOI membranes show high tensile strength of 117-160 MPa and good elongation at break of 7.5-9.0% as thermally treated at 400 degrees C for 2 h. The t-TR400-2 membrane comprising the TFMB codiamine exhibits a synergistic effect of high gas permeability and high gas pairs selectivity, which is mainly attributed to the loose chains packing resulted from the thermal rearrangement and the substituted bulky -CF3 group that resulting a high fractional free volume (FFV approximate to 0.15). The systematic structure/property relationship studies serve as a guide of materials and process development of commercial TR membranes for gas separation applications.
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem