Syndiotactic- and heterotactic-specific radical polymerizations of N-n-propyl-浼?fluoroacrylamide and phase-transition behaviors of aqueous solutions of poly(N-n-propyl-浼?fluoroacrylamide) was written by Hirano, Tomohiro;Furutani, Takahiro;Oshimura, Miyuki;Ute, Koichi. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2012.Quality Control of 3,5-Dimethylpyridine 1-oxide This article mentions the following:
Radical polymerization of N-n-propyl-浼?fluoroacrylamide (NNPFAAm) was studied in several solvents at low temperatures in the presence or absence of Lewis bases, Lewis acids, alkyl alcs., silyl alcs., or fluorinated alcs. Different effects of solvents and additives on stereospecificity were observed in the radical polymerizations of NNPFAAm and its hydrocarbon analogs such as N-isopropylacrylamide (NIPAAm) and N-n-propylacrylamide (NNPAAm); for instance, syndiotactic (and heterotactic) specificities were induced in radical polymerization of NNPFAAm in polar solvents (and in toluene in the presence of alkyl and silyl alcs.), whereas isotactic (and syndiotactic) specificities were induced in radical polymerizations of the hydrocarbon analogs under the corresponding conditions. In contrast, heterotactic specificity induced by fluorinated alcs. was further enhanced in radical polymerization of NNPFAAm. The effects of stereoregularity on the phase-transition behaviors of aqueous solutions of poly(NNPFAAm) were also studied. Different tendencies in stereoregularity were observed in aqueous solutions of poly(NNPFAAm)s from those in solutions of the hydrocarbon analogs such as poly(NIPAAm) and poly (NNPAAm). The polymerization behavior of NNPFAAm and the phase-transition behavior of aqueous poly(NNPFAAm) are discussed based on possible fluorine-fluorine repulsion between the monomer and propagating chain-end, and neighboring monomeric units. 婕?2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8Quality Control of 3,5-Dimethylpyridine 1-oxide).
3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Quality Control of 3,5-Dimethylpyridine 1-oxide