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Synthesis of a novel star‐shaped dendrimer by radial‐growth polymerization of sarcosine N ‐carboxyanhydride initiated with poly(trimethyleneimine) dendrimer
Author(s) -
Aoi Keigo,
Hatanaka Tadashi,
Tsutsumiuchi Kaname,
Okada Masahiko,
Imae Toyoko
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990701)20:7<378::aid-marc378>3.0.co;2-s
Subject(s) - dendrimer , polymer chemistry , copolymer , materials science , branching (polymer chemistry) , polymerization , monomer , radius of gyration , polymer , degree of polymerization , hydrodynamic radius , composite material
A novel AB n ‐type dendrimer/linear polymer block copolymer, i.e., poly(trimethyleneimine) dendrimer‐ block ‐(polysarcosine) 64 ( 1 ), was synthesized by ring‐opening polymerization of sarcosine N ‐carboxyanhydride initiated with the 64‐NH 2 ‐terminal poly(trimethyleneimine) dendrimer as a macroinitiator. 1 has narrow molecular weight distributions ( M w / M n = 1.0 1 –1.0 3 , by size exclusion chromatography) and controlled polysarcosine chain lengths (by varying the monomer/dendrimer feed molar ratios). Small‐angle neutron scattering (SANS) data obtained in D 2 O solution of 1 (DP's of polysarcosine = 2.0 and 24) fitted well with a Guinier plot of a spherical particle, and gave diameters of 44 and 100 Å, respectively.