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Molecular dynamics of 2-, 4- and 6-arm star-shaped poly(ɛ-caprolactone)s (PCLs) functionalized with pyrene at all chain ends followed by excimer formation were investigated in THF as a solvent. Dilute solutions (10 −8 to 10 −6 molL −1 ) of these polymers revealed excimer emission due to the intramolecular cyclization, proceeding via chain end interaction. Time-resolved fluorescence...
Following our previous papers on mechanism of cyclic esters' polymerization coinitiated by tin(II) octoate [tin(II) bis-(2-ethylhexanoate), (Sn(Oct) 2 )] in the presence of either the low molar mass coinitiator (an alcohol, hydroxy acid, or H 2 O) or a macromolecule fitted with a hydroxy end group (ROH), the present work deals with ɛ-caprolactone (CL) and l,l-lactide (LA) polymerizations...
Conditions of the living homopolymerization of ε-caprolactone (CL), lactides (LA), and of the homo-oligomerization of γ-butyrolactone (BL) are briefly described. Then block and random copolymerizations of CL with LA are shortly reviewed. The microstructure of the resulting copolyesters in relation to some peculiarities of these processes is discussed in more detail. It is also shown that the otherwise...
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