Novel macrocyclic aryl thioether ester oligomers: structure characterization and free-radical ring opening polymerization
✍ Scribed by Yinghua Qi; Tianlu Chen; Hongyan Jiang; Shuqin Bo; Yan Xing; Yonghua Lin; Jiping Xu
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 64 KB
- Volume
- 200
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Novel macrocyclic aryl thioether ester oligomers have been synthesized in high yield from phthaloyl dichloride and 4,49-thiodiphenol under pseudo high dilution conditions. The cyclic nature was unambiguously confirmed by a combination of MALDI-TOF MS, gel permeation chromatography and NMR analyses. Single-crystal X-ray diffraction of cyclic ester dimer reveals no severe strain on the cyclic structure. The free-radical ring opening polymerization (ROP) of the macrocyclic oligomers was achieved to give high molecular weight polymers via a transthioetherification reaction. The molecular weight of the polymer resulting from ROP decreases as the conversion of cyclic oligomers increases after a polymerization period of 30 min.