The copolymerization of SO2 with propylene oxide mediated by organic ammonium salts: a comprehensive study of the main-chain structure, living polymerization character and regioselectivity was written by Jin, Xian-Chao;Ren, Bai-Hao;Gu, Ge-Ge;Yue, Tian-Jun;Ren, Wei-Min. And the article was included in Polymer Chemistry in 2022.Recommanded Product: 75-57-0 The following contents are mentioned in the article:
The utilization of sulfur dioxide (SO2) for constructing sulfur-containing polymers is of much significance in terms of both environmental issues and obtaining high-value materials. The copolymerization of SO2 with epoxides is deemed to be an efficient way to meet this desire. However, several problems, including issues involving mixed polymer segments (polysulfite vs. polyether), cyclic byproducts, uncontrolled mol. weights, and undetermined stereochem., have largely limited the development of this reaction. This study investigates these problems via studying the organic ammonium salt catalyzed copolymerization of SO2 with propylene oxide (PO). Main-chain anal. via NMR spectroscopy, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), and electrospray ionization-mass spectrometry (ESI-MS) proved that the copolymer was an alternating copolymer. The co-present polyether segments had a cyclic structure, which was the result of the cationic homopolymerization of PO. Furthermore, the low enantiomeric excess (ee) of the copolymer hydrolysis products, derived from the copolymerization of SO2 with optically pure PO, suggested the poor regioselectivity of copolymerization, and this was further proved via d. functional theory (DFT) calculations Addnl., the cyclic sulfite byproducts turned out to be generated via alkoxide back-biting at the sulfite units in the polymer chains. This study involved multiple reactions and reactants, such as Tetramethylammonium chloride (cas: 75-57-0Recommanded Product: 75-57-0).
Tetramethylammonium chloride (cas: 75-57-0) belongs to organic chlorides. Organic chlorides can cause corrosion in pipelines, valves and condensers, and cause catalyst poisoning. The hydrocarbon processing industry (HPI) and others are affected by damage caused by these substances. Aliphatic organochlorides are often alkylating agents as chlorine can act as a leaving group, which can result in cellular damage.Recommanded Product: 75-57-0
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics