期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 31, 期 3, 页码 258-264出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200900472
关键词
biopolymers; monofunctional PEGs; polyethers; PEGylations; random copolymers
Hetero-multifunctional poly(ethylene glycol-co-glycerol) random copolymers with multiple hydroxyl functionalities and a single terminal functionality have been prepared by copolymerization of ethylene oxide (ECI) and ethoxy ethyl glycidyl ether (EEGE) with the use of a suitable initiator, introducing a protected amino group or a double bond, respectively. Acidic deprotection was used for removal of the acetal protecting groups in the chain, and the terminal amino group was regenerated by catalytic hydrogenation. A series of copolymers with narrow polydispersity was obtained, varying comonomer fractions from 3 to 67% and molecular weights in the range of 5 000-32 000 g . mol(-1) (1.05 < <(M)over bar>(w) /(M) over bar (n) < 1.25). Molecular and thermal characterization was carried out using H-1- and C-13 NMR, SEC and differential scanning calorimetry (DSC).
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