Chemical Research Letters, May 2021. As an important bridge between the micro and macro material world, chemistry is one of the main methods and means for humans to understand and transform the material world., Category: pyrrolines, Introducing a new discovery about 256-96-2, Name is 5H-Dibenzo[b,f]azepine, molecular formula is C14H11N, belongs to pyrrolines compound. In a document, author is Sheng, Liping.
Polymerization mechanism of 4-APN and a new catalyst for phthalonitrile resin polymerization
The widely used catalysts for phthalonitrile (PN) resin polymerization are aromatic compounds containing -NH2 because of their high catalytic performances. However, the catalytic mechanisms of these catalysts are not very clear. To understand the mechanisms of them, the widely used autocatalytic catalyst 4-(4-aminophenoxy)-phthalonitrile (4-APN) was studied in this paper. The polymerization process of 4-APN was tracked by a multi-purpose method, and ammonia gas was detected during the cross-linking processing for the fist time. Combined with the online IR results of the curing process of 4-APN, the mechanism of ammonia generation was newly proposed. Based on this mechanism, a new catalyst selection strategy was promoted, which is different from the traditional approach to catalyst selection for PN resin polymerization. According to the new strategy, 1,3-diiminoisoindoline (1,3-DII) was selected as a novel catalyst. The results showed that the new catalyst could not only effectively catalyze the polymerization of PN resin, but also has a lower curing temperature than that of organic amine catalysts and can eliminate the release of ammonia gas and the voids in the products caused thereby. Therefore, the results of this study will give important enlightenment to the development of PN catalysts and the development of PN.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 256-96-2. Category: pyrrolines.
Reference:
Pyrroline – Wikipedia,
,1-Pyrroline | C4H7N – PubChem