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Influence of Diurethane Linkers on the Langmuir Layer Behavior of Oligo[(rac‐lactide)‐ co ‐glycolide]‐based Polyesterurethanes
Author(s) -
Schöne AnneChristin,
Richau Klaus,
Kratz Karl,
Schulz Burkhard,
Lendlein Andreas
Publication year - 2015
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/marc.201500316
Subject(s) - lactide , layer (electronics) , polymer chemistry , langmuir , materials science , chemical engineering , chemistry , composite material , organic chemistry , copolymer , polymer , adsorption , engineering
Three oligo[( rac ‐lactide)‐ co ‐glycolide] based polyesterurethanes (OLGA‐PUs) containing different diurethane linkers are investigated by the Langmuir monolayer technique and compared to poly[( rac ‐lactide)‐ co ‐glycolide] (PLGA) to elucidate the influence of the diurethane junction units on hydrophilicity and packing motifs of these polymers at the air–water interface. The presence of diurethane linkers does not manifest itself in the Langmuir layer behavior both in compression and expansion experiments when monomolecular films of OLGA‐PUs are spread on the water surface. However, the linker retard the evolution of morphological structures at intermediate compression level under isobaric conditions (with a surface pressure greater than 11 mN m −1 ) compared to the PLGA, independent on the chemical structure of the diurethane moiety. The layer thicknesses of both OLGA‐PU and PLGA films decrease in the high compression state with decreasing surface pressure, as deduced from ellipsometric data. All films must be described with the effective medium approximation as water swollen layers.