New discoveries in chemical research and development in 2021. Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals. In an article, author is Gan, Feng, once mentioned the application of 136630-39-2, COA of Formula: https://www.ambeed.com/products/136630-39-2.html, Name is 2,7-Dibromo-9H-carbazole, molecular formula is C12H7Br2N, molecular weight is 325, MDL number is MFCD09033507, category is benzoxazole. Now introduce a scientific discovery about this category.
Simultaneously achieving excellent mechanical properties and superior gas separation performance remains a great challenge for thermally rearranged polymers when applied as the membrane materials in large scale gas separation applications. Herein, different heteroaromatic non-TR-able codiamines containing benzimidazole/benzoxazole structures were incorporated into ortho-hydroxyl functionalized polyimide backbones, which were subsequently transformed into the poly(benzoxazole-co-polyimide) copolymers by thermal rearrangement (TR). In all cases, the solid-state TR reaction induces the increased preferential intersegmental distances (d-spacing) and fractional free volumes of polymer chains, favorable for the gas permeation. While, the pi-pi stacking distance exhibits opposite variation tendencies for benzimidazole-based and benzoxazole-based TR-PBOI membranes, which is demonstrated to make a significant effect on the gas selectivity. These TR-PBOI membranes thermally treated at 420 degrees C for 1 h exhibit higher tensile properties in relative to most of previously reported TR-PBOI membranes with the tensile strength of 97-118 MPa and initial modulus of 2.0-2.4 GPa. Moreover, incorporating heteroaromatic non-TR-able codiamines endows the resultant TR-PBOI membranes with excellent gas separation properties for the CO2/CH4 gas pairs with the CO2 permeability and CO2/CH4 ideal selectivity values exceeding the 1991 upper bound and close to 2008 upper bound. We anticipate this facile method will facilitate the large-scale preparation and application of TR membranes for gas separation.
But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 136630-39-2, you can contact me at any time and look forward to more communication. COA of Formula: https://www.ambeed.com/products/136630-39-2.html.
Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem