Dimeric cyclotetramethylenecarbonate (TeMC)2 was polymerized in bulk at 185OC. Either nBuSnC1, or Sn(II)2-ethylhexanoate (SnOct2) were used as catalysts. SnOct, proved to be somewhat less reactive, but high yields (up to 93%) and high viscosities (qinh up to 0.85 dL/g) were obtained with both cataly
โฆ LIBER โฆ
Polymers of carbonic acid 18: polymerizations of cyclobis(hexamethylene carbonate) by means of BuSnCl3 or Sn(II)2-ethylhexanoate
โ Scribed by Hans R. Kricheldorf; Andreas Mahler
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 654 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0032-3861
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Cyclobis(diethy1ene glycol carbonate), (DEGC),, was synthesized by polycondensation of diethylene glycol with diethyl carbonate followed by thermal depolymerization of the crude polycarbonate in vacuo. BuSnCl,-initiated polymerizations of (DEGC)2 in chlorobenzene at 100 "C gave poor results. Therefo