The cationic ring-opening polymerization of six-membered cyclic pseudoureas, 2-(1-pyrrolidinyl)-( 2a) and 2-morpholino-5,6-dihydro-4H-1,3-oxazine ( 2b), was examined, which proceeded in two different ways, depending on the nature of initiator. The polymerization of 2 with methyl p-toluenesulfonate o
Ring-Opening Polymerization of Aromatic 6-Membered Cyclic Disulfide and Characterization of the Polymer
โ Scribed by Ishida, Hidenobu; Kisanuki, Atsushi; Endo, Kiyoshi
- Book ID
- 111777191
- Publisher
- Nature Publishing Group
- Year
- 2009
- Tongue
- English
- Weight
- 322 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0032-3896
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๐ SIMILAR VOLUMES
The ring-opening polymerization of cyclic (aromatic disulfide) oligomers derived from 4,4Lisopropylidene bisthiophenol was studied both in diphenyl ether solution and in the melt. The polymers formed were soluble in solvents such as chloroform, tetrahydrofuran, DMF, NMP and characterized by n.m.r.,
Mechanisms of the ring-opening reaction of ;hree-membered cyclic compounds are characterized with respect to the spin-and space-symmetry conservations. The results arc related with the biradical and zwittcrionic chvocters of the intermediate species formed