Hyperbranched polyglycerols exceeding M-n > 15,000 g/mol (DPn > 270) have been prepared, using a modified version of the synthetic protocol reported earlier. In the optimized process polydispersities recorded by SEC remained narrow, with M-w/M-n < 1.7 over a large molecular weight range. The drastic increase of viscositity in the course of the reaction, was found to be responsible for the increased fraction of cycles (MALDI-TOF MS) at high molecular weights. [References: 11]
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