Ring-opening polymerization study of cyclic (aromatic disulfide) oligomers derived from 4,4′-isopropylidene bisthiophenol

✍ Scribed by Yong Ding; Allan S. Hay

• Book ID: 104164502
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 448 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00761-6

✦ Synopsis

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., g.p.c., d.s.c, and t.g.a, techniques. The ring-opening polymerization began at about 150°C in solution, but did not begin until around 200°C in the melt, as determined by the melting point of the cyclic oligomers. A 13Cn.m.r, study indicated that structurally regular polydisulfides were formed below 250°C, however, structural irregularity occurred above this temperature. There were no cross-linking reactions observed below 300°C for short times, although cross-linking was very serious above 300°C.