Poly(ϵ-caprolactone) by Combined Ring-Opening Polymerization and Polycondensation
作者： Hans R. Kricheldorf , Steffen M. Weidner , Felix Scheliga , Mohammed Lahcini
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摘要: Numerous water-initiated polymerizations of eCL are conducted in bulk with variation catalyst, reaction time, and temperature. The conversions determined by 1H NMR the molar masses SEC measurements. For at 100 °C, Bi triflate Hf used as catalysts, whereas 140 Al triflate, Sn(II) SnCl2, HfCl4, BiCl3, LaCl3 used. In addition to a closed vessel, experiments also performed stirring vacuum. Under these conditions, best catalyst (SnCl2) yields 2–3 times higher mass spectra indicate significant fraction cyclic polymers. results prove that modification procedure may stimulate polycondesation process without change
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