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Synthesis and Characterization of New Block Copolymers with Poly(ethylene oxide) and Poly[3( S )‐ sec ‐butylmorpholine‐2,5‐dione] Sequences
Author(s) -
Feng Yakai,
Klee Doris,
Keul Helmut,
Höcker Hartwig
Publication year - 2001
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/1616-5195(200101)1:1<30::aid-mabi30>3.0.co;2-v
Subject(s) - copolymer , ethylene oxide , polymer chemistry , crystallinity , molar mass , polymer , polymerization , oxide , materials science , ethylene , chemistry , catalysis , organic chemistry , composite material
Four different types of polydepsipeptide‐polyether block copolymers were synthesized via ring‐opening polymerization of 3( S )‐ sec ‐butylmorpholine‐2,5‐dione (BMD) in the presence of hydroxytelechelic poly(ethylene oxide) (PEO) with stannous octoate as a catalyst.The polymers were an AB block copolymer, an ABA block copolymer, an (A) 2 B star shaped copolymer and an (A) 2 B(A) 2 copolymer, where A is a poly[3( S )‐ sec ‐butylmorpholine‐2,5‐dione] (PBMD) and B a poly(ethylene oxide) block. The molar ratio of BMD to PEO was varied to obtain copolymers with different weight fractions of PBMD blocks ranging from 59.8 to 96.7 wt.‐%. The crystallinity of the PEO phase in the copolymers decreases in the following order: AB > (A) 2 B > ABA > (A) 2 B(A) 2 . The static contact angle θ decreases with increasing PEO content in the block copolymers.