Cumene peroxide is an important oxidant in the chemistry industry; however, the conversion and selectivity of cumene peroxide are still not desirable in the practical preparation process because there are some side reactions occurring in the high conversion. Hence, the reaction mechanism is investigated by many researchers. Fortunately, the high catalysis performance polymeric catalyst for cumene peroxidation was successfully synthesized in a previous study, thus, the reaction mechanism is to be investigated in this study. Except for cumene peroxide, three by-products, including acetophenone, 2-phenyl-2-propanol, 1-methylethenyl benzene of cumene peroxidation are identified from the results of high performance liquid chromatography (HPLC), gas chromatography mass spectroscopy (GC-MS), H 1 -NMR analysis. Furthermore, the mechanism of cumene peroxidation catalyzed by cobalt(II)-chelated copolymer is also proposed herein. The initiation rate equation represents r i ¼ k[cumene] 1.0 [polymer-Co(II) complex] 0.5 according to the kinetic study of cumene peroxidation catalyzed by metal-chelated copolymer. Meanwhile, the activation energy of cumene peroxidation by metal-chelated copolymer catalyst is 10.7 kcal/mol, which is located in the range of radical reactions. a High performance liquid chromatograph (HPLC, LC-9A Shimadzu Ltd. Co.) with TSK gel ODS-80TM (Shimadzu) column. b Gas chromatography online mass spectrophotometry (GC-MASS, VG-70-250S). c H 1 -Nuclear magnetic resonance (Bruker AMX-200 FT-NMR spectrophotometer).
SUMMARY: A new synthetic method of preparing poly(ester-b-sulfone)s from sodium formaldehyde sulfoxylate (SFS) and a diacrylate monomer (1,6-hexanediol diacrylate or 1,9-nonanediol diacrylate) in aqueous solution was studied. The structures of poly(ester-b-sulfone)s were identified and their crystal morphology analyzed. It turned out that the poly(ester-b-sulfone)s crystals were ring-shaped spherulites. The melting point of both poly(ester-b-sulfone)s was 97 8C and 116 8C, respectively. The thermal degradation temperature in both cases was close to 281 8C.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.